Initiative and referendum process ballot measures

Voters have decided on initiative and referendum process ballot measures across the U.S. As a state ballot measure topic, this includes measures regarding the initiative and referendum process, such as signature requirements, deadlines, and other requirements. The topic is grouped within the election policy area.

This page provides information on:

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• Upcoming ballot measures
• Comprehensive list of ballot measures by year and state

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Upcoming ballot measures

See also: 2026 ballot measures and 2027 ballot measures

The following is a list of state ballot measures related to this topic that are certified or potential for this year and future elections:

2026

1. Arkansas Create a Fundamental Right to Initiative and Referendum Amendment (2026) - Potential
2. Arkansas Initiative and Referendum Process Amendment (2026) - Potential
3. California Allow Voting on Citizen Initiatives at Primary Elections Measure (2026) - Potential
4. California Authorize Citizen-Initiated Constitutional Revisions Amendment (2026) - Potential
5. California Changes to Initiative Process and Requirements Initiative (2026) - Potential
6. California Vote Requirements for Initiatives Requiring Supermajority Votes Amendment (2026) - On the ballot
7. Idaho HJR 4, Grant Legislature Exclusive Authority and Prohibit Citizen-Initiated Measures on Marijuana, Narcotics, and Psychoactive Substances Amendment (2026) - On the ballot
8. Missouri Amendment 4, Require Congressional District Approval for Initiated Constitutional Amendments, Prohibit Foreign Contributions, and Penalize Petition Fraud Amendment (2026) - On the ballot
9. Missouri Electronic Signatures for Citizen Initiatives Measure (2026) - Potential
10. Missouri Initiative Process, Foreign Campaign Funds, and Prohibition of Certain Activities by Legislators Amendment (2026) - Potential
11. Nebraska Require a Four-Fifths Vote for Legislative Ballot Initiative Changes Amendment (2026) - Potential
12. North Dakota 60% Vote Requirement for Constitutional Amendments Measure (2026) - On the ballot
13. North Dakota Single-Subject Requirement for Constitutional Amendments Measure (June 2026) - On the ballot
14. South Dakota Constitutional Amendment L, 60% Vote Requirement for Constitutional Amendments Measure (2026) - On the ballot
15. South Dakota Require Three-Fourths Legislative Vote and Voter Approval to Amend Initiated Laws Initiative (2026) - Potential
16. South Dakota Require Voter Approval for Legislative Changes to Initiative and Referendum Process Amendment (2026) - Potential
17. Utah 60% Vote Requirement for Ballot Initiatives to Increase or Expand Taxes Amendment (2026) - On the ballot

List of state ballot measures

Click the tabs to view state ballot measures related to this topic, organized by year or state.

Years

States

2026

1. Arkansas Create a Fundamental Right to Initiative and Referendum Amendment (2026) - Potential
2. Arkansas Initiative and Referendum Process Amendment (2026) - Potential
3. California Allow Voting on Citizen Initiatives at Primary Elections Measure (2026) - Potential
4. California Authorize Citizen-Initiated Constitutional Revisions Amendment (2026) - Potential
5. California Changes to Initiative Process and Requirements Initiative (2026) - Potential
6. California Vote Requirements for Initiatives Requiring Supermajority Votes Amendment (2026) - On the ballot
7. Idaho HJR 4, Grant Legislature Exclusive Authority and Prohibit Citizen-Initiated Measures on Marijuana, Narcotics, and Psychoactive Substances Amendment (2026) - On the ballot
8. Missouri Amendment 4, Require Congressional District Approval for Initiated Constitutional Amendments, Prohibit Foreign Contributions, and Penalize Petition Fraud Amendment (2026) - On the ballot
9. Missouri Electronic Signatures for Citizen Initiatives Measure (2026) - Potential
10. Missouri Initiative Process, Foreign Campaign Funds, and Prohibition of Certain Activities by Legislators Amendment (2026) - Potential
11. Nebraska Require a Four-Fifths Vote for Legislative Ballot Initiative Changes Amendment (2026) - Potential
12. North Dakota 60% Vote Requirement for Constitutional Amendments Measure (2026) - On the ballot
13. North Dakota Single-Subject Requirement for Constitutional Amendments Measure (June 2026) - On the ballot
14. South Dakota Constitutional Amendment L, 60% Vote Requirement for Constitutional Amendments Measure (2026) - On the ballot
15. South Dakota Require Three-Fourths Legislative Vote and Voter Approval to Amend Initiated Laws Initiative (2026) - Potential
16. South Dakota Require Voter Approval for Legislative Changes to Initiative and Referendum Process Amendment (2026) - Potential
17. Utah 60% Vote Requirement for Ballot Initiatives to Increase or Expand Taxes Amendment (2026) - On the ballot

2024

1. Arizona Proposition 134, Signature Distribution Requirement for Initiatives Amendment (2024)
2. Arizona Proposition 136, Legal Challenges to Constitutionality of Initiatives Amendment (2024)
3. Colorado Amendment K, Initiative and Referendum Filing and Judicial Retention Filing Deadlines Amendment (2024)
4. North Dakota Constitutional Measure 2, Single-Subject Requirement for Initiatives and Require Constitutional Initiatives to be Passed Twice Amendment (2024)

2023

1. Maine Question 5, Change Time Period of Judicial Review of Initiative Petitions Amendment (2023)
2. Maine Question 7, Remove Residency Requirement for Initiative Petition Circulators Amendment (2023)
3. Ohio Issue 1, 60% Vote Requirement to Approve Constitutional Amendments Measure (2023)

2022

1. Arizona Proposition 128, Legislative Changes to Ballot Initiatives with Invalid Provisions Amendment (2022)
2. Arizona Proposition 129, Single-Subject Requirement for Ballot Initiatives Amendment (2022)
3. Arizona Proposition 132, 60% Vote Requirement for Ballot Measures to Approve Taxes Amendment (2022)
4. Arkansas Issue 2, 60% Supermajority Vote Requirement for Constitutional Amendments and Ballot Initiatives Measure (2022)
5. Colorado Proposition GG, Include Income Tax Effects in Initiative Ballot Language Measure (2022)
6. South Dakota Constitutional Amendment C, 60% Vote Requirement for Ballot Measures Increasing Taxes or Appropriating $10 Million Measure (June 2022)

2020

1. Arkansas Issue 3, Initiative Process and Legislative Referral Requirements Amendment (2020)
2. Florida Amendment 4, Require Constitutional Amendments to be Passed Twice Initiative (2020)
3. Montana C-46, Initiated Amendment Distribution Requirements Measure (2020)
4. Montana C-47, Initiated Statute and Referendum Distribution Requirements Amendment (2020)
5. North Dakota Constitutional Measure 2, Require Initiated Constitutional Amendments to be Approved by the Legislature or Passed Twice Amendment (2020)

2019

1. Maine Question 2, Allow for Alternative Initiative Signatures for Persons with Disabilities Amendment (2019)

2018

1. Florida Amendment 3, Voter Approval of Casino Gambling Initiative (2018)
2. South Dakota Constitutional Amendment W, State Campaign Finance and Lobbying Laws, Government Accountability Board, and Initiative Process Amendment (2018)
3. South Dakota Constitutional Amendment X, 55% Vote Requirement to Approve Constitutional Amendments Measure (2018)
4. South Dakota Constitutional Amendment Z, Single-Subject Rule for Constitutional Amendments (2018)
5. South Dakota Initiated Measure 24, Ban Out-of-State Contributions to Ballot Question Committees Initiative (2018)

2016

1. Colorado Amendment 71, 55% Vote Requirement and Signature Distribution Requirement for Constitutional Amendments Measure (2016)

2015

1. Ohio Issue 2, Ballot Initiatives to Create Monopolies Amendment (2015)

2014

1. Arkansas Ballot Measure Signature Requirements Amendment, Issue 2 (2014)
2. North Dakota Initiative Filing Deadline Amendment, Measure 1 (June 2014)
3. North Dakota Referral and Initiative Reform Amendment, Measure 4 (2014)

2013

1. Washington "Protect the Initiative Act", Initiative 517 (2013)

2010

1. Arizona Proposition 112, Ballot Initiative Filing Deadline Amendment (2010)
2. Oklahoma State Question 750, Initiative and Referendum Signature Requirements Amendment (2010)

2009

1. Maine Question 7, Municipal Certification Deadline for Initiatives Amendment (2009)

2008

1. Arizona Proposition 105, Supermajority Requirement for Tax and Spending Initiatives Amendment (2008)
2. Colorado Referendum O, Citizens' Initiative Changes Amendment (2008)
3. Ohio Issue 1, Ballot Initiative Signature Deadline Amendment (2008)
4. Wyoming Constitutional Amendment B, Initiative Signature Distribution Requirement Measure (2008)

2006

1. Colorado Amendment 38, Citizens' Initiative and Referendum Process Initiative (2006)
2. Florida Amendment 3, 60% Majority Requirement for Constitutional Amendments Amendment (2006)
3. Maine Question 2, Change Deadline for Submission of Signatures for Statewide Initiatives Measures (2006)

2004

1. Alaska Measure 1, Change Signature Distribution Requirement for Initiatives Amendment (2004)
2. Arizona Proposition 101, Require Ballot Initiatives Proposing Spending to Include Provisions on Revenue Generation Amendment (2004)
3. Arizona Proposition 104, Extending Initiative Petition Circulation Period and Changing Filing Deadline Amendment (2004)
4. Florida Amendment 2, Requirements for Citizens' Initiatives Amendment (2004)
5. Nebraska Initiative Measure 417, Authorize Gambling Laws by Initiative Amendment (2004)
6. Nebraska Initiative Measure 418, Legislative Supermajority to Modify Initiatives Amendment (2004)
7. North Dakota Initiative Measure Fiscal Impact Referendum, Constitutional Measure 2 (2004)

2002

1. Florida Amendment 2, Economic Impact Statements for Initiatives Amendment (2002)
2. Montana Distribution Requirements for Constitutional Initiatives, C-37 (2002)
3. Montana Distribution Requirements for Statutory Initiatives, C-38 (2002)
4. Oklahoma State Question 698, Initiative Signature Requirements Amendment (2002)
5. Oregon Measure 26, Prohibit Payment Based On Per Signature Gathered Initiative (2002)

2000

1. Alaska Measure 1, Prohibit Ballot Initiatives on Hunting Amendment (2000)
2. Arizona Proposition 102, Two-Thirds Vote Requirement for Hunting-Related Initiatives Amendment (2000)
3. Nebraska Amendment 3A, Require Constitutional Amendments to Pass Twice Measure (2000)
4. Nebraska Amendment 3B, Initiative and Referendum Definition Measure (2000)
5. Nebraska Amendment 3C, Changes to Initiative Filing Requirements Measure (2000)
6. Oregon Measure 78, Lengthened Period for Verifying Petition Signatures Amendment (May 2000)
7. Oregon Measure 79, Increase Signature Requirement for Citizen-Initiated Constitutional Amendments Measure (May 2000)
8. Oregon Measure 96, Prohibit Legislature from Making Initiative Process Harder Initiative (2000)
9. South Dakota Amendment B, Authorize Citizen Initiatives for Local Government Consolidation Measure (2000)

1999

1. Maine Question 8, People's Veto Election Timing Amendment (1999)

1998

1. Arizona Proposition 104, Limits on Legislative Alteration of Voter-Approved Initiatives and Referendums Amendment (1998)
2. Arizona Proposition 105, Prohibit Legislative Alteration of Ballot Initiatives Amendment (1998)
3. California Proposition 219, Uniform Application of Ballot Measures Amendment (June 1998)
4. Mississippi Resident Only Initiative Petition Circulation, Amendment 1 (1998)
5. Missouri Amendment 1, Change Signature Deadline for Ballot Initiatives Measure (1998)
6. Nebraska Amendment 5A, Single Subject Requirement for Initiatives Measure (May 1998)
7. Nebraska Amendment 5B, Single Subject Requirement for Veto Referendums Measure (May 1998)
8. Nevada Question 1, Conflicting Voter-Approved Laws Resolution Amendment (1998)
9. Oregon Measure 62, Campaign Finance and Signature Gathering Regulation Initiative (1998)
10. Oregon Measure 63, Supermajority Vote for Ballot Measures Proposing Supermajority Requirements Initiative (1998)
11. Utah Proposition 5, Two-Thirds Vote Requirement for Hunting-Related Initiatives Amendment (1998)
12. Wyoming Signature Distribution Requirements, Amendment B (1998)

1996

1. Arkansas Legal Changes to Ballot Titles, Proposed Amendment 3 (1996)
2. Colorado Amendment 13, Initiative, Referendum, and Petition Process Initiative (1996)
3. Maine Question 8, Municipal Certification of Direct Initiative Petitions Amendment (1996)
4. Nebraska Initiative Measure 410, Changes to Initiative Signature Requirements Amendment (1996)
5. Oregon Measure 24, Requirements for Initiative Petition Signatures Amendment (May 1996)
6. Oregon Measure 33, Legislative Limits on Changing Voter Approved Statutes Initiative (1996)
7. Oregon Measure 46, Require Majority of Registered Voters to Approve Tax Increase Ballot Measures Initiative (1996)
8. Rhode Island Question 8, Initiative Process Advisory Question (1996)

1994

1. Colorado Referendum A, Single-Subject Rule for Initiatives Amendment (1994)
2. Florida Amendment 4, Initiatives on Raising Government Revenue Initiative (1994)

1992

1. Mississippi Amendment 8, Establish Initiated Constitutional Amendments Measure (1992)

1990

1. California Proposition 137, Voter Approval for Certain Rules Governing Initiatives Amendment (1990)

1988

1. Nebraska Amendment 3A, Signature Requirements for Signers of Initiatives Measure (1988)
2. Nevada Question 1, Filing Deadlines for Initiatives and Referendums Amendment (1988)
3. North Dakota Suspension of Tax Measures Referendum, Measure 1 (1988)
4. South Dakota Amendment A, Remove Legislature from Initiative Process Measure (1988)

1986

1. Colorado Amendment No. 3, Franchises in Home Rule Municipalities Amendment (1986)
2. Florida Amendment 4, Supreme Court Advisory Opinions on Initiatives Amendment (1986)
3. Maine Obscene Material Prohibition Initiative (June 1986)
4. Maine Question 1, Mandatory Local Measured Phone Service Ban Initiative (1986)
5. Oregon Measure 3, Verification of Initiative and Referendum Petition Signatures Amendment (May 1986)
6. Rhode Island Question 5, Citizen-Initiated Ballot Measure Process and Nonpartisan Constitutional Convention Candidates Amendment (1986)
7. Wyoming Initiative and Referendum, Amendment 1 (1986)

1984

1. Arizona Proposition 100, Initiative and Referendum Petition Filing Deadlines Amendment (1984)

1982

1. Maine Question 1, Adjust Individual Income Tax for Inflation Initiative (1982)
2. Maryland Alteration of Signature Requirements, Question 5 (1982)

1981

1. Maine Proposed Constitutional Amendment No. 1, Initiative Signature Validity and Form of Ballot Question Measure (1981)
2. Washington SJR 133, Initiatives to the Legislature Signature Submission and Verification Timeline Amendment (1981)

1980

1. California Proposition 4, Elections Regarding Low-Income Housing Amendment (June 1980)
2. Colorado Amendment No. 1, Initiative and Referendum Process Amendment (1980)
3. Idaho SJR 112, Simple Majority Vote for Citizen Initiatives and Allow Initiatives on General Election Ballots Amendment (1980)
4. Maine Proposed Constitutional Amendment No. 2, Ballot Initiative and Veto Referendum Elections Measure (1980)
5. Minnesota Amendment 5, Initiative and Referendum Amendment (1980)
6. North Dakota Election Law Revision Referendum, Measure 8 (1980)
7. South Dakota Amendment C, Prohibit Legislature from Changing Initiated Laws Measure (1980)
8. South Dakota Amendment D, Legislative Restrictions to Amend Initiated Laws (1980)

1978

1. North Dakota Direct Democracy Referendum, Amendment 3 (1978)
2. Ohio Issue 1, Ballot Board to Write Measure Language Amendment (June 1978)
3. Oregon Measure 1, Initiative and Referendum Requirements for County Home Rule Amendment (May 1978)

1977

1. Maine Uniform State Property Tax Initiative (December 1977)

1976

1. Maryland Petition Filing Requirements, Question 13 (1976)
2. Nevada Question 10, Limits of Initiative Questions Amendment (1976)
3. Ohio Issue 7, Initiative and Referendum Signature Requirements Initiative (1976)
4. Utah Initiative A, Prohibit Fluoridation of Public Water Without Voter-Approved Initiative Measure (1976)

1975

1. Maine Question 4, Initiative and Referendum Petition Procedures Amendment (1975)

1974

1. Maine Weight of Commercial Vehicles and Related Provisions Referendum (1974)
2. Ohio Issue 3, Ohio Ballot Board and Constitutional Amendments Measure (May 1974)
3. Oklahoma State Question 495, Simple Majority Vote for Citizen Initiatives Measure (August 1974)
4. Oklahoma State Question 496, Simple Majority Vote for Constitutional Amendments Measure (August 1974)
5. South Dakota Amendment A, Restructure of Legislative Department Measure (1974)
6. South Dakota Amendment B, Voting Rights Expansion Measure (1974)

1972

1. Florida Amendment 3, Single Subject Initiatives Amendment (1972)
2. Maine Question 1, General Election Ballot Form Initiative (June 1972)
3. Nevada Question 5, Require Initiatives Proposing Spending Include Funding Source Amendment (1972)
4. North Dakota Direct Democracy Signature Requirements, Alternate Proposition 2 (1972)
5. South Dakota Amendment E, Initiated Constitutional Amendment and Constitution Revision Measure (1972)

1970

1. California Proposition 16, Constitutional Amendments and Conventions Amendment (1970)
2. South Dakota Amendment B, Initiative and Referendum Requirements Measure (1970)
3. South Dakota Amendment I, Constitutional Revision Measure (1970)

1968

1. Florida Amendment 1, Constitution Revision Measure (1968)
2. Oregon Measure 2, Change Initiative and Referendum Signature Requirements from Based on Supreme Court to Gubernatorial Election Turnout Amendment (May 1968)
3. Wyoming Amendment 2, Initiative and Referendum Process Measure (1968)

1966

1. California Proposition 1A, Revisions to the Constitution Amendment (1966)

1962

1. Maryland Change the Number of Signatures Required on a Petition, Amendment 2 (1962)
2. Nevada Question 2, Replace Indirect Process and Require Initiated Constitutional Amendments to Pass Twice Initiative (1962)

1958

1. Nevada Question 1, Signature Increase and Distribution Requirement for Initiatives Amendment (1958)
2. North Dakota Direct Democracy and Publicity Pamphlet, Referendum 2 (1958)

1956

1. Washington SJR 4, Change Signature Requirements for Initiatives and Referendums Amendment (1956)

1954

1. Oregon Measure 4, Increase Signature Requirement for Citizen-Initiated Constitutional Amendments Measure (1954)

1952

1. Oklahoma State Question 353, Single-Subject Rule and Separate-Vote Requirement for Constitutional Amendments Measure (July 1952)
2. Washington Substitute SJR 7, Limits on Legislative Alteration of Voter-Approved Ballot Measures Amendment (1952)

1951

1. Maine Question 6, Direct Initiatives Signature Requirements Amendment (September 1951)

1950

1. California Proposition 2, Prohibit Naming Individuals to Public Office Through Ballot Measures Amendment (1950)
2. Maine Proposed Constitutional Amendment 2, Change Filing Date for Initiated Legislation Measure (September 1950)
3. Massachusetts Question 2, Percentage-Based Signature Requirement for Citizen-Initiated Ballot Measures Amendment (1950)

1948

1. California Proposition 10, Single-Subject Rule for Initiatives Amendment (1948)
2. Maine Proposed Constitutional Amendment 1, Change Initiative Petition Signature Requirements Measure (September 1948)

1946

1. California Proposition 12, Legislative Alteration of Voter-Approved Initiatives Amendment (1946)

1944

1. Massachusetts Question 1, Require Summary for Ballot Measures Amendment (1944)

1942

1. North Dakota Constitutional Amendments Referendum (1942)
2. North Dakota Direct Democracy Referendum (1942)

1941

1. Michigan Proposal 1, Initiated Constitutional Amendment Signature Verification and Fraud Penalties Amendment (April 1941)
2. Michigan Proposal 2, Initiated Statute and Referendum Signature Verification and Fraud Penalties Amendment (April 1941)

1940

1. Missouri Amendment 4, Change Signature Requirement Basis for Initiative Petitions Measure (1940)
2. North Dakota Legislative Power and Direct Democracy Referendum (1940)

1939

1. Ohio Initiative and Referendum Signature Requirements Initiative (1939)

1938

1. California Proposition 17, Require Initiatives to Qualify 130 Days Before Election Amendment (1938)

1936

1. North Dakota Legislative Power and Direct Democracy Referendum (1936)

1934

1. Colorado Measure 4, Voters to Impose or Approve Excise Taxes Initiative (1934)
2. Idaho HJR 7, Simple Majority Vote for Citizen Initiatives Measure (1934)

1932

1. California Proposition 8, Attorney General to Write Ballot Titles and Summaries for Initiatives Amendment (1932)
2. North Dakota Future Constitutional Amendments Referendum (1932)
3. North Dakota Legislative Power and Direct Democracy Referendum (1932)

1924

1. Missouri Amendment 2, Initiative and Referendum Signature Requirement Increase Measure (February 1924)
2. South Dakota Referred Law 3, Primary Elections Law Referendum (1924)

1922

1. California Proposition 27, Initiative Signature Requirement Initiative (1922)
2. South Dakota Amendment B, Initiative and Referendum Signature Increase Measure (1922)

1920

1. California Proposition 4, Initiative Signature Requirement Initiative (1920)
2. Nebraska Amendment 39, Constitutional Amendment Vote Requirements Amendment (September 1920)
3. Nebraska Amendment 4, Initiative and Referendum Signature Requirements Amendment (September 1920)

1918

1. Colorado Publication of Ballot Measures, Measure 5 (1918)
2. Massachusetts Question 1, Initiative and Referendum Process Amendment (1918)
3. North Dakota Requirements for Constitutional Amendment Passage Initiative (1918)
4. North Dakota Simplified Initiative and Referendum Process Initiative (1918)
5. Ohio Veto Referendums on Legislative Ratification of Federal Constitutional Amendments Initiative (1918)

1916

1. Arizona Measure Nos. 100-101, Require Majority of Votes Cast in Election to Approve Ballot Initiatives Amendment (1916)
2. Minnesota Amendment 7, Initiative and Referendum Measure (1916)
3. Washington Referendum 3, Require Initiative and Referendum Petition Signers to Sign in Presence of Registration Officer Measure (1916)

1915

1. California Proposition 7, Two-Thirds Vote Requirement for Initiated Bond Measures Amendment (October 1915)
2. Maryland Amendment 4, Establish Veto Referendum Amendment (1915)
3. Ohio Prohibit Re-Submitting Twice Rejected Constitutional Amendments for Six Years Initiative (1915)

1914

1. Arizona Measure Nos. 102-103, Eight-Year Waiting Period for Repeated Prohibition Elections Initiative (1914)
2. Arizona Measure Nos. 108-109, Prohibit Legislative Changes or Governor's Veto of Initiatives and Referendums Amendment (1914)
3. Colorado Measure 1, Rules on Rejected and Conflicting Initiative Initiative (1914)
4. Colorado Measure 4, Right to Petition Governor for Special Election on Measures Initiative (1914)
5. Minnesota Amendment 1, Initiative and Referendum Measure (1914)
6. Mississippi Initiative and Referendum Amendment (1914)
7. Missouri Amendment 1, Initiative and Referendum Tax-Related Subject Restrictions Measure (1914)
8. North Dakota Establish Initiated Constitutional Amendments Measure (1914)
9. North Dakota Initiative and Referendum Measure (1914)
10. South Dakota Amendment 4, Municipal Initiative and Referendum Measure (1914)
11. Texas Proposition 1, Initiative and Referendum Process Amendment (1914)
12. Wisconsin Question 2, Initiative and Referendum Amendment (1914)
13. Wisconsin Question 8, Provide for Initiated Constitutional Amendments Measure (1914)

1913

1. Michigan Initiatives and Referendums for Statutes Amendment (April 1913)
2. Michigan Initiatives for Constitutional Amendments Amendment (April 1913)

1912

1. Colorado "Headless Ballot", Measure 14 (1912)
2. Colorado Special Elections for Initiatives and Referendums, Measure 11 (1912)
3. Idaho SJR 12, Veto Referendum Process Amendment (1912)
4. Idaho SJR 13, Initiative Process Amendment (1912)
5. Mississippi Initiative and Referendum Amendment (1912)
6. Nebraska Amendment 1, Initiative and Referendum Amendment (1912)
7. Nevada State Question 1, Nevada Initiative and Referendum Amendment (1912)
8. Ohio Initiative and Referendum Process Amendment (September 1912)
9. Ohio Simple Majority Vote for Constitutional Amendments Measure (September 1912)
10. Oregon Measure Nos. 310-311, Require Majority of Votes Cast in Election to Approve Constitutional Amendments Measure (1912)
11. Oregon Measure Nos. 322-323, Require Majority of Votes Cast in Election to Approve Ballot Initiatives Measure (1912)
12. Washington Initiative and Referendum Process Amendment (1912)
13. Wyoming Amendment 1, Initiative and Referendum Measure (1912)

1911

1. California Proposition 7, Initiative and Referendum Amendment (October 1911)

1910

1. Arkansas Amendment 10, Initiative and Referendum Process Measure (September 1910)
2. Colorado Referendum 3, Initiative and Referendum Amendment (1910)
3. Illinois Initiative and Referendum Process Advisory Question (1910)
4. Oregon Measure Nos. 360-361, Direct Democracy, Electoral System, and Legislature Changes Initiative (1910)

1908

1. Maine Initiative and Referendum Amendment (1908)
2. Michigan Constitution Revision Measure (1908)
3. Missouri Amendment 3, Initiative and Referendum Process Measure (1908)

1906

1. Delaware Initiative and Referendum Advisory Question (1906)
2. Montana Amendment 1, Initiative and Referendum Amendment (1906)
3. Oregon Measure Nos. 314-315, Local Initiative and Referendum Process Initiative (June 1906)

1904

1. Missouri Amendment 2, Initiative and Referendum Process Measure (1904)
2. Nevada Question 1, Veto Referendum Process Amendment (1904)

1902

1. Illinois Local Initiative and Referendum Process Advisory Question (1902)
2. Illinois State Initiative and Referendum Process Advisory Question (1902)
3. Oregon Measure Nos. 105-106, Initiative and Referendum Process Amendment (June 1902)

1900

1. Utah Initiative and Referendum Amendment (1900)

1898

1. South Dakota Initiative and Referendum Process Amendment (1898)

Alaska

1. Alaska Measure 1, Change Signature Distribution Requirement for Initiatives Amendment (2004)
2. Alaska Measure 1, Prohibit Ballot Initiatives on Hunting Amendment (2000)

Arizona

1. Arizona Measure Nos. 100-101, Require Majority of Votes Cast in Election to Approve Ballot Initiatives Amendment (1916)
2. Arizona Measure Nos. 102-103, Eight-Year Waiting Period for Repeated Prohibition Elections Initiative (1914)
3. Arizona Measure Nos. 108-109, Prohibit Legislative Changes or Governor's Veto of Initiatives and Referendums Amendment (1914)
4. Arizona Proposition 100, Initiative and Referendum Petition Filing Deadlines Amendment (1984)
5. Arizona Proposition 101, Require Ballot Initiatives Proposing Spending to Include Provisions on Revenue Generation Amendment (2004)
6. Arizona Proposition 102, Two-Thirds Vote Requirement for Hunting-Related Initiatives Amendment (2000)
7. Arizona Proposition 104, Extending Initiative Petition Circulation Period and Changing Filing Deadline Amendment (2004)
8. Arizona Proposition 104, Limits on Legislative Alteration of Voter-Approved Initiatives and Referendums Amendment (1998)
9. Arizona Proposition 105, Prohibit Legislative Alteration of Ballot Initiatives Amendment (1998)
10. Arizona Proposition 105, Supermajority Requirement for Tax and Spending Initiatives Amendment (2008)
11. Arizona Proposition 112, Ballot Initiative Filing Deadline Amendment (2010)
12. Arizona Proposition 128, Legislative Changes to Ballot Initiatives with Invalid Provisions Amendment (2022)
13. Arizona Proposition 129, Single-Subject Requirement for Ballot Initiatives Amendment (2022)
14. Arizona Proposition 132, 60% Vote Requirement for Ballot Measures to Approve Taxes Amendment (2022)
15. Arizona Proposition 134, Signature Distribution Requirement for Initiatives Amendment (2024)
16. Arizona Proposition 136, Legal Challenges to Constitutionality of Initiatives Amendment (2024)

Arkansas

1. Arkansas Amendment 10, Initiative and Referendum Process Measure (September 1910)
2. Arkansas Ballot Measure Signature Requirements Amendment, Issue 2 (2014)
3. Arkansas Create a Fundamental Right to Initiative and Referendum Amendment (2026) - Potential
4. Arkansas Initiative and Referendum Process Amendment (2026) - Potential
5. Arkansas Issue 2, 60% Supermajority Vote Requirement for Constitutional Amendments and Ballot Initiatives Measure (2022)
6. Arkansas Issue 3, Initiative Process and Legislative Referral Requirements Amendment (2020)
7. Arkansas Legal Changes to Ballot Titles, Proposed Amendment 3 (1996)

California

1. California Allow Voting on Citizen Initiatives at Primary Elections Measure (2026) - Potential
2. California Authorize Citizen-Initiated Constitutional Revisions Amendment (2026) - Potential
3. California Changes to Initiative Process and Requirements Initiative (2026) - Potential
4. California Proposition 10, Single-Subject Rule for Initiatives Amendment (1948)
5. California Proposition 12, Legislative Alteration of Voter-Approved Initiatives Amendment (1946)
6. California Proposition 137, Voter Approval for Certain Rules Governing Initiatives Amendment (1990)
7. California Proposition 16, Constitutional Amendments and Conventions Amendment (1970)
8. California Proposition 17, Require Initiatives to Qualify 130 Days Before Election Amendment (1938)
9. California Proposition 1A, Revisions to the Constitution Amendment (1966)
10. California Proposition 2, Prohibit Naming Individuals to Public Office Through Ballot Measures Amendment (1950)
11. California Proposition 219, Uniform Application of Ballot Measures Amendment (June 1998)
12. California Proposition 27, Initiative Signature Requirement Initiative (1922)
13. California Proposition 4, Elections Regarding Low-Income Housing Amendment (June 1980)
14. California Proposition 4, Initiative Signature Requirement Initiative (1920)
15. California Proposition 7, Initiative and Referendum Amendment (October 1911)
16. California Proposition 7, Two-Thirds Vote Requirement for Initiated Bond Measures Amendment (October 1915)
17. California Proposition 8, Attorney General to Write Ballot Titles and Summaries for Initiatives Amendment (1932)
18. California Vote Requirements for Initiatives Requiring Supermajority Votes Amendment (2026) - On the ballot

Colorado

1. Colorado "Headless Ballot", Measure 14 (1912)
2. Colorado Amendment 13, Initiative, Referendum, and Petition Process Initiative (1996)
3. Colorado Amendment 38, Citizens' Initiative and Referendum Process Initiative (2006)
4. Colorado Amendment 71, 55% Vote Requirement and Signature Distribution Requirement for Constitutional Amendments Measure (2016)
5. Colorado Amendment K, Initiative and Referendum Filing and Judicial Retention Filing Deadlines Amendment (2024)
6. Colorado Amendment No. 1, Initiative and Referendum Process Amendment (1980)
7. Colorado Amendment No. 3, Franchises in Home Rule Municipalities Amendment (1986)
8. Colorado Measure 1, Rules on Rejected and Conflicting Initiative Initiative (1914)
9. Colorado Measure 4, Right to Petition Governor for Special Election on Measures Initiative (1914)
10. Colorado Measure 4, Voters to Impose or Approve Excise Taxes Initiative (1934)
11. Colorado Proposition GG, Include Income Tax Effects in Initiative Ballot Language Measure (2022)
12. Colorado Publication of Ballot Measures, Measure 5 (1918)
13. Colorado Referendum 3, Initiative and Referendum Amendment (1910)
14. Colorado Referendum A, Single-Subject Rule for Initiatives Amendment (1994)
15. Colorado Referendum O, Citizens' Initiative Changes Amendment (2008)
16. Colorado Special Elections for Initiatives and Referendums, Measure 11 (1912)

Delaware

1. Delaware Initiative and Referendum Advisory Question (1906)

Florida

1. Florida Amendment 1, Constitution Revision Measure (1968)
2. Florida Amendment 2, Economic Impact Statements for Initiatives Amendment (2002)
3. Florida Amendment 2, Requirements for Citizens' Initiatives Amendment (2004)
4. Florida Amendment 3, 60% Majority Requirement for Constitutional Amendments Amendment (2006)
5. Florida Amendment 3, Single Subject Initiatives Amendment (1972)
6. Florida Amendment 3, Voter Approval of Casino Gambling Initiative (2018)
7. Florida Amendment 4, Initiatives on Raising Government Revenue Initiative (1994)
8. Florida Amendment 4, Require Constitutional Amendments to be Passed Twice Initiative (2020)
9. Florida Amendment 4, Supreme Court Advisory Opinions on Initiatives Amendment (1986)

Idaho

1. Idaho HJR 4, Grant Legislature Exclusive Authority and Prohibit Citizen-Initiated Measures on Marijuana, Narcotics, and Psychoactive Substances Amendment (2026) - On the ballot
2. Idaho HJR 7, Simple Majority Vote for Citizen Initiatives Measure (1934)
3. Idaho SJR 112, Simple Majority Vote for Citizen Initiatives and Allow Initiatives on General Election Ballots Amendment (1980)
4. Idaho SJR 12, Veto Referendum Process Amendment (1912)
5. Idaho SJR 13, Initiative Process Amendment (1912)

Illinois

1. Illinois Initiative and Referendum Process Advisory Question (1910)
2. Illinois Local Initiative and Referendum Process Advisory Question (1902)
3. Illinois State Initiative and Referendum Process Advisory Question (1902)

Maine

1. Maine Initiative and Referendum Amendment (1908)
2. Maine Obscene Material Prohibition Initiative (June 1986)
3. Maine Proposed Constitutional Amendment 1, Change Initiative Petition Signature Requirements Measure (September 1948)
4. Maine Proposed Constitutional Amendment 2, Change Filing Date for Initiated Legislation Measure (September 1950)
5. Maine Proposed Constitutional Amendment No. 1, Initiative Signature Validity and Form of Ballot Question Measure (1981)
6. Maine Proposed Constitutional Amendment No. 2, Ballot Initiative and Veto Referendum Elections Measure (1980)
7. Maine Question 1, Adjust Individual Income Tax for Inflation Initiative (1982)
8. Maine Question 1, General Election Ballot Form Initiative (June 1972)
9. Maine Question 1, Mandatory Local Measured Phone Service Ban Initiative (1986)
10. Maine Question 2, Allow for Alternative Initiative Signatures for Persons with Disabilities Amendment (2019)
11. Maine Question 2, Change Deadline for Submission of Signatures for Statewide Initiatives Measures (2006)
12. Maine Question 4, Initiative and Referendum Petition Procedures Amendment (1975)
13. Maine Question 5, Change Time Period of Judicial Review of Initiative Petitions Amendment (2023)
14. Maine Question 6, Direct Initiatives Signature Requirements Amendment (September 1951)
15. Maine Question 7, Municipal Certification Deadline for Initiatives Amendment (2009)
16. Maine Question 7, Remove Residency Requirement for Initiative Petition Circulators Amendment (2023)
17. Maine Question 8, Municipal Certification of Direct Initiative Petitions Amendment (1996)
18. Maine Question 8, People's Veto Election Timing Amendment (1999)
19. Maine Uniform State Property Tax Initiative (December 1977)
20. Maine Weight of Commercial Vehicles and Related Provisions Referendum (1974)

Maryland

1. Maryland Alteration of Signature Requirements, Question 5 (1982)
2. Maryland Amendment 4, Establish Veto Referendum Amendment (1915)
3. Maryland Change the Number of Signatures Required on a Petition, Amendment 2 (1962)
4. Maryland Petition Filing Requirements, Question 13 (1976)

Massachusetts

1. Massachusetts Question 1, Initiative and Referendum Process Amendment (1918)
2. Massachusetts Question 1, Require Summary for Ballot Measures Amendment (1944)
3. Massachusetts Question 2, Percentage-Based Signature Requirement for Citizen-Initiated Ballot Measures Amendment (1950)

Michigan

1. Michigan Constitution Revision Measure (1908)
2. Michigan Initiatives and Referendums for Statutes Amendment (April 1913)
3. Michigan Initiatives for Constitutional Amendments Amendment (April 1913)
4. Michigan Proposal 1, Initiated Constitutional Amendment Signature Verification and Fraud Penalties Amendment (April 1941)
5. Michigan Proposal 2, Initiated Statute and Referendum Signature Verification and Fraud Penalties Amendment (April 1941)

Minnesota

1. Minnesota Amendment 1, Initiative and Referendum Measure (1914)
2. Minnesota Amendment 5, Initiative and Referendum Amendment (1980)
3. Minnesota Amendment 7, Initiative and Referendum Measure (1916)

Mississippi

1. Mississippi Amendment 8, Establish Initiated Constitutional Amendments Measure (1992)
2. Mississippi Initiative and Referendum Amendment (1912)
3. Mississippi Initiative and Referendum Amendment (1914)
4. Mississippi Resident Only Initiative Petition Circulation, Amendment 1 (1998)

Missouri

1. Missouri Amendment 1, Change Signature Deadline for Ballot Initiatives Measure (1998)
2. Missouri Amendment 1, Initiative and Referendum Tax-Related Subject Restrictions Measure (1914)
3. Missouri Amendment 2, Initiative and Referendum Process Measure (1904)
4. Missouri Amendment 2, Initiative and Referendum Signature Requirement Increase Measure (February 1924)
5. Missouri Amendment 3, Initiative and Referendum Process Measure (1908)
6. Missouri Amendment 4, Change Signature Requirement Basis for Initiative Petitions Measure (1940)
7. Missouri Amendment 4, Require Congressional District Approval for Initiated Constitutional Amendments, Prohibit Foreign Contributions, and Penalize Petition Fraud Amendment (2026) - On the ballot
8. Missouri Electronic Signatures for Citizen Initiatives Measure (2026) - Potential
9. Missouri Initiative Process, Foreign Campaign Funds, and Prohibition of Certain Activities by Legislators Amendment (2026) - Potential

Montana

1. Montana Amendment 1, Initiative and Referendum Amendment (1906)
2. Montana C-46, Initiated Amendment Distribution Requirements Measure (2020)
3. Montana C-47, Initiated Statute and Referendum Distribution Requirements Amendment (2020)
4. Montana Distribution Requirements for Constitutional Initiatives, C-37 (2002)
5. Montana Distribution Requirements for Statutory Initiatives, C-38 (2002)

Nebraska

1. Nebraska Amendment 1, Initiative and Referendum Amendment (1912)
2. Nebraska Amendment 39, Constitutional Amendment Vote Requirements Amendment (September 1920)
3. Nebraska Amendment 3A, Require Constitutional Amendments to Pass Twice Measure (2000)
4. Nebraska Amendment 3A, Signature Requirements for Signers of Initiatives Measure (1988)
5. Nebraska Amendment 3B, Initiative and Referendum Definition Measure (2000)
6. Nebraska Amendment 3C, Changes to Initiative Filing Requirements Measure (2000)
7. Nebraska Amendment 4, Initiative and Referendum Signature Requirements Amendment (September 1920)
8. Nebraska Amendment 5A, Single Subject Requirement for Initiatives Measure (May 1998)
9. Nebraska Amendment 5B, Single Subject Requirement for Veto Referendums Measure (May 1998)
10. Nebraska Initiative Measure 410, Changes to Initiative Signature Requirements Amendment (1996)
11. Nebraska Initiative Measure 417, Authorize Gambling Laws by Initiative Amendment (2004)
12. Nebraska Initiative Measure 418, Legislative Supermajority to Modify Initiatives Amendment (2004)
13. Nebraska Require a Four-Fifths Vote for Legislative Ballot Initiative Changes Amendment (2026) - Potential

Nevada

1. Nevada Question 1, Conflicting Voter-Approved Laws Resolution Amendment (1998)
2. Nevada Question 1, Filing Deadlines for Initiatives and Referendums Amendment (1988)
3. Nevada Question 1, Signature Increase and Distribution Requirement for Initiatives Amendment (1958)
4. Nevada Question 1, Veto Referendum Process Amendment (1904)
5. Nevada Question 10, Limits of Initiative Questions Amendment (1976)
6. Nevada Question 2, Replace Indirect Process and Require Initiated Constitutional Amendments to Pass Twice Initiative (1962)
7. Nevada Question 5, Require Initiatives Proposing Spending Include Funding Source Amendment (1972)
8. Nevada State Question 1, Nevada Initiative and Referendum Amendment (1912)

North Dakota

1. North Dakota 60% Vote Requirement for Constitutional Amendments Measure (2026) - On the ballot
2. North Dakota Constitutional Amendments Referendum (1942)
3. North Dakota Constitutional Measure 2, Require Initiated Constitutional Amendments to be Approved by the Legislature or Passed Twice Amendment (2020)
4. North Dakota Constitutional Measure 2, Single-Subject Requirement for Initiatives and Require Constitutional Initiatives to be Passed Twice Amendment (2024)
5. North Dakota Direct Democracy Referendum, Amendment 3 (1978)
6. North Dakota Direct Democracy Referendum (1942)
7. North Dakota Direct Democracy Signature Requirements, Alternate Proposition 2 (1972)
8. North Dakota Direct Democracy and Publicity Pamphlet, Referendum 2 (1958)
9. North Dakota Election Law Revision Referendum, Measure 8 (1980)
10. North Dakota Establish Initiated Constitutional Amendments Measure (1914)
11. North Dakota Future Constitutional Amendments Referendum (1932)
12. North Dakota Initiative Filing Deadline Amendment, Measure 1 (June 2014)
13. North Dakota Initiative Measure Fiscal Impact Referendum, Constitutional Measure 2 (2004)
14. North Dakota Initiative and Referendum Measure (1914)
15. North Dakota Legislative Power and Direct Democracy Referendum (1932)
16. North Dakota Legislative Power and Direct Democracy Referendum (1936)
17. North Dakota Legislative Power and Direct Democracy Referendum (1940)
18. North Dakota Referral and Initiative Reform Amendment, Measure 4 (2014)
19. North Dakota Requirements for Constitutional Amendment Passage Initiative (1918)
20. North Dakota Simplified Initiative and Referendum Process Initiative (1918)
21. North Dakota Single-Subject Requirement for Constitutional Amendments Measure (June 2026) - On the ballot
22. North Dakota Suspension of Tax Measures Referendum, Measure 1 (1988)

Ohio

1. Ohio Initiative and Referendum Process Amendment (September 1912)
2. Ohio Initiative and Referendum Signature Requirements Initiative (1939)
3. Ohio Issue 1, 60% Vote Requirement to Approve Constitutional Amendments Measure (2023)
4. Ohio Issue 1, Ballot Board to Write Measure Language Amendment (June 1978)
5. Ohio Issue 1, Ballot Initiative Signature Deadline Amendment (2008)
6. Ohio Issue 2, Ballot Initiatives to Create Monopolies Amendment (2015)
7. Ohio Issue 3, Ohio Ballot Board and Constitutional Amendments Measure (May 1974)
8. Ohio Issue 7, Initiative and Referendum Signature Requirements Initiative (1976)
9. Ohio Prohibit Re-Submitting Twice Rejected Constitutional Amendments for Six Years Initiative (1915)
10. Ohio Simple Majority Vote for Constitutional Amendments Measure (September 1912)
11. Ohio Veto Referendums on Legislative Ratification of Federal Constitutional Amendments Initiative (1918)

Oklahoma

1. Oklahoma State Question 353, Single-Subject Rule and Separate-Vote Requirement for Constitutional Amendments Measure (July 1952)
2. Oklahoma State Question 495, Simple Majority Vote for Citizen Initiatives Measure (August 1974)
3. Oklahoma State Question 496, Simple Majority Vote for Constitutional Amendments Measure (August 1974)
4. Oklahoma State Question 698, Initiative Signature Requirements Amendment (2002)
5. Oklahoma State Question 750, Initiative and Referendum Signature Requirements Amendment (2010)

Oregon

1. Oregon Measure 1, Initiative and Referendum Requirements for County Home Rule Amendment (May 1978)
2. Oregon Measure 2, Change Initiative and Referendum Signature Requirements from Based on Supreme Court to Gubernatorial Election Turnout Amendment (May 1968)
3. Oregon Measure 24, Requirements for Initiative Petition Signatures Amendment (May 1996)
4. Oregon Measure 26, Prohibit Payment Based On Per Signature Gathered Initiative (2002)
5. Oregon Measure 3, Verification of Initiative and Referendum Petition Signatures Amendment (May 1986)
6. Oregon Measure 33, Legislative Limits on Changing Voter Approved Statutes Initiative (1996)
7. Oregon Measure 4, Increase Signature Requirement for Citizen-Initiated Constitutional Amendments Measure (1954)
8. Oregon Measure 46, Require Majority of Registered Voters to Approve Tax Increase Ballot Measures Initiative (1996)
9. Oregon Measure 62, Campaign Finance and Signature Gathering Regulation Initiative (1998)
10. Oregon Measure 63, Supermajority Vote for Ballot Measures Proposing Supermajority Requirements Initiative (1998)
11. Oregon Measure 78, Lengthened Period for Verifying Petition Signatures Amendment (May 2000)
12. Oregon Measure 79, Increase Signature Requirement for Citizen-Initiated Constitutional Amendments Measure (May 2000)
13. Oregon Measure 96, Prohibit Legislature from Making Initiative Process Harder Initiative (2000)
14. Oregon Measure Nos. 105-106, Initiative and Referendum Process Amendment (June 1902)
15. Oregon Measure Nos. 310-311, Require Majority of Votes Cast in Election to Approve Constitutional Amendments Measure (1912)
16. Oregon Measure Nos. 314-315, Local Initiative and Referendum Process Initiative (June 1906)
17. Oregon Measure Nos. 322-323, Require Majority of Votes Cast in Election to Approve Ballot Initiatives Measure (1912)
18. Oregon Measure Nos. 360-361, Direct Democracy, Electoral System, and Legislature Changes Initiative (1910)

Rhode Island

1. Rhode Island Question 5, Citizen-Initiated Ballot Measure Process and Nonpartisan Constitutional Convention Candidates Amendment (1986)
2. Rhode Island Question 8, Initiative Process Advisory Question (1996)

South Dakota

1. South Dakota Amendment 4, Municipal Initiative and Referendum Measure (1914)
2. South Dakota Amendment A, Remove Legislature from Initiative Process Measure (1988)
3. South Dakota Amendment A, Restructure of Legislative Department Measure (1974)
4. South Dakota Amendment B, Authorize Citizen Initiatives for Local Government Consolidation Measure (2000)
5. South Dakota Amendment B, Initiative and Referendum Requirements Measure (1970)
6. South Dakota Amendment B, Initiative and Referendum Signature Increase Measure (1922)
7. South Dakota Amendment B, Voting Rights Expansion Measure (1974)
8. South Dakota Amendment C, Prohibit Legislature from Changing Initiated Laws Measure (1980)
9. South Dakota Amendment D, Legislative Restrictions to Amend Initiated Laws (1980)
10. South Dakota Amendment E, Initiated Constitutional Amendment and Constitution Revision Measure (1972)
11. South Dakota Amendment I, Constitutional Revision Measure (1970)
12. South Dakota Constitutional Amendment C, 60% Vote Requirement for Ballot Measures Increasing Taxes or Appropriating $10 Million Measure (June 2022)
13. South Dakota Constitutional Amendment L, 60% Vote Requirement for Constitutional Amendments Measure (2026) - On the ballot
14. South Dakota Constitutional Amendment W, State Campaign Finance and Lobbying Laws, Government Accountability Board, and Initiative Process Amendment (2018)
15. South Dakota Constitutional Amendment X, 55% Vote Requirement to Approve Constitutional Amendments Measure (2018)
16. South Dakota Constitutional Amendment Z, Single-Subject Rule for Constitutional Amendments (2018)
17. South Dakota Initiated Measure 24, Ban Out-of-State Contributions to Ballot Question Committees Initiative (2018)
18. South Dakota Initiative and Referendum Process Amendment (1898)
19. South Dakota Referred Law 3, Primary Elections Law Referendum (1924)
20. South Dakota Require Three-Fourths Legislative Vote and Voter Approval to Amend Initiated Laws Initiative (2026) - Potential
21. South Dakota Require Voter Approval for Legislative Changes to Initiative and Referendum Process Amendment (2026) - Potential

Texas

1. Texas Proposition 1, Initiative and Referendum Process Amendment (1914)

Utah

1. Utah 60% Vote Requirement for Ballot Initiatives to Increase or Expand Taxes Amendment (2026) - On the ballot
2. Utah Initiative A, Prohibit Fluoridation of Public Water Without Voter-Approved Initiative Measure (1976)
3. Utah Initiative and Referendum Amendment (1900)
4. Utah Proposition 5, Two-Thirds Vote Requirement for Hunting-Related Initiatives Amendment (1998)

Washington

1. Washington "Protect the Initiative Act", Initiative 517 (2013)
2. Washington Initiative and Referendum Process Amendment (1912)
3. Washington Referendum 3, Require Initiative and Referendum Petition Signers to Sign in Presence of Registration Officer Measure (1916)
4. Washington SJR 133, Initiatives to the Legislature Signature Submission and Verification Timeline Amendment (1981)
5. Washington SJR 4, Change Signature Requirements for Initiatives and Referendums Amendment (1956)
6. Washington Substitute SJR 7, Limits on Legislative Alteration of Voter-Approved Ballot Measures Amendment (1952)

Wisconsin

1. Wisconsin Question 2, Initiative and Referendum Amendment (1914)
2. Wisconsin Question 8, Provide for Initiated Constitutional Amendments Measure (1914)

Wyoming

1. Wyoming Amendment 1, Initiative and Referendum Measure (1912)
2. Wyoming Amendment 2, Initiative and Referendum Process Measure (1968)
3. Wyoming Constitutional Amendment B, Initiative Signature Distribution Requirement Measure (2008)
4. Wyoming Initiative and Referendum, Amendment 1 (1986)
5. Wyoming Signature Distribution Requirements, Amendment B (1998)

See also

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Footnotes

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