Illinois' 15th Congressional District

Illinois' 15th Congressional District

Incumbent

Mary Miller

Assumed office: January 3, 2021

Illinois' 15th Congressional District in the United States House of Representatives is represented by Mary Miller (R).

As of the 2020 Census, Illinois representatives represented an average of 754,279 residents. After the 2010 Census, each member represented 714,688 residents.

Elections

2024

See also: Illinois' 15th Congressional District election, 2024

Illinois' 15th Congressional District election, 2024 (March 19 Republican primary)

Illinois' 15th Congressional District election, 2024 (March 19 Democratic primary)

General election

General election for U.S. House Illinois District 15

Incumbent Mary Miller won election in the general election for U.S. House Illinois District 15 on November 5, 2024.

		Candidate	%	Votes
✔		Mary Miller (R)	99.5	308,825
		Other/Write-in votes	0.5	1,409

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	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 310,234
= candidate completed the Ballotpedia Candidate Connection survey.
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Democratic primary election

Democratic primary for U.S. House Illinois District 15

No candidate advanced from the primary.

		Candidate	%	Votes
		Kevin Gaither (Write-in)	100.0	259

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Vote totals may be incomplete for this race.
	There were no incumbents in this race. The results have been certified. Source	Total votes: 259
= candidate completed the Ballotpedia Candidate Connection survey.
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Republican primary election

Republican primary for U.S. House Illinois District 15

Incumbent Mary Miller advanced from the Republican primary for U.S. House Illinois District 15 on March 19, 2024.

		Candidate	%	Votes
✔		Mary Miller	100.0	65,205

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	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 65,205
= candidate completed the Ballotpedia Candidate Connection survey.
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2022

See also: Illinois' 15th Congressional District election, 2022

General election

General election for U.S. House Illinois District 15

Incumbent Mary Miller defeated Paul Lange in the general election for U.S. House Illinois District 15 on November 8, 2022.

		Candidate	%	Votes
✔		Mary Miller (R)	71.1	213,007
		Paul Lange (D)	28.9	86,396

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	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 299,403
= candidate completed the Ballotpedia Candidate Connection survey.
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Democratic primary election

Democratic primary for U.S. House Illinois District 15

Paul Lange advanced from the Democratic primary for U.S. House Illinois District 15 on June 28, 2022.

		Candidate	%	Votes
✔		Paul Lange	100.0	21,433

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	There were no incumbents in this race. The results have been certified. Source	Total votes: 21,433
= candidate completed the Ballotpedia Candidate Connection survey.
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Republican primary election

Republican primary for U.S. House Illinois District 15

Incumbent Mary Miller defeated incumbent Rodney Davis in the Republican primary for U.S. House Illinois District 15 on June 28, 2022.

		Candidate	%	Votes
✔		Mary Miller	57.4	64,549
		Rodney Davis	42.6	47,852

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	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 112,401
= candidate completed the Ballotpedia Candidate Connection survey.
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2020

See also: Illinois' 15th Congressional District election, 2020

General election

General election for U.S. House Illinois District 15

Mary Miller defeated Erika Weaver in the general election for U.S. House Illinois District 15 on November 3, 2020.

		Candidate	%	Votes
✔		Mary Miller (R)	73.4	244,947
		Erika Weaver (D)	26.6	88,559

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	There were no incumbents in this race. The results have been certified. Source	Total votes: 333,506
= candidate completed the Ballotpedia Candidate Connection survey.
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Withdrawn or disqualified candidates

• Kathleen McManamon (L)

Democratic primary election

Democratic primary for U.S. House Illinois District 15

Erika Weaver defeated Kevin Gaither, Craig Morton, and John Hursey Jr. in the Democratic primary for U.S. House Illinois District 15 on March 17, 2020.

		Candidate	%	Votes
✔		Erika Weaver	51.9	17,778
		Kevin Gaither	22.3	7,653
		Craig Morton	19.2	6,576
		John Hursey Jr.	6.6	2,244

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	There were no incumbents in this race. The results have been certified. Source	Total votes: 34,251 (100.00% precincts reporting)
= candidate completed the Ballotpedia Candidate Connection survey.
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Republican primary election

Republican primary for U.S. House Illinois District 15

Mary Miller defeated Darren Duncan, Kerry Wolff, and Charles Ellington in the Republican primary for U.S. House Illinois District 15 on March 17, 2020.

		Candidate	%	Votes
✔		Mary Miller	57.4	48,129
		Darren Duncan	21.8	18,309
	Submit photo	Kerry Wolff	13.4	11,208
		Charles Ellington	7.4	6,200

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	There were no incumbents in this race. The results have been certified. Source	Total votes: 83,846 (100.00% precincts reporting)
= candidate completed the Ballotpedia Candidate Connection survey.
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Withdrawn or disqualified candidates

• Kimberly Wade (R)
• Lori Fuller (R)
• Ron McCuan (R)
• Jacob Lane (R)
• Alex Walker (R)
• John Christian Bambenek (R)
• Kent Gray (R)

2018

See also: Illinois' 15th Congressional District election, 2018

General election

General election for U.S. House Illinois District 15

Incumbent John Shimkus defeated Kevin Gaither in the general election for U.S. House Illinois District 15 on November 6, 2018.

		Candidate	%	Votes
✔		John Shimkus (R)	70.9	181,294
		Kevin Gaither (D)	29.1	74,309
		Other/Write-in votes	0.0	5

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	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 255,608
= candidate completed the Ballotpedia Candidate Connection survey.
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Democratic primary election

Democratic primary for U.S. House Illinois District 15

Kevin Gaither defeated Carl Spoerer in the Democratic primary for U.S. House Illinois District 15 on March 20, 2018.

		Candidate	%	Votes
✔		Kevin Gaither	62.1	17,300
		Carl Spoerer	37.9	10,573

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	There were no incumbents in this race. The results have been certified.	Total votes: 27,873
= candidate completed the Ballotpedia Candidate Connection survey.
If you are a candidate and would like to tell readers and voters more about why they should vote for you, complete the Ballotpedia Candidate Connection Survey.
Do you want a spreadsheet of this type of data? Contact our sales team.

Republican primary election

Republican primary for U.S. House Illinois District 15

Incumbent John Shimkus advanced from the Republican primary for U.S. House Illinois District 15 on March 20, 2018.

		Candidate	%	Votes
✔		John Shimkus	100.0	73,825

---

	Incumbents are bolded and underlined. The results have been certified.	Total votes: 73,825
= candidate completed the Ballotpedia Candidate Connection survey.
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2016

See also: Illinois' 15th Congressional District election, 2016

Heading into the election, Ballotpedia rated this race as safely Republican. Incumbent John Shimkus (R) was unopposed in the general election on November 8, 2016. Shimkus defeated Kyle McCarter in the Republican primary on March 15, 2016.

U.S. House, Illinois District 15 General Election, 2016

Party		Candidate	Vote %	Votes
	Republican	John Shimkus Incumbent	100%	274,554
Total Votes				274,554
Source: Illinois State Board of Elections

U.S. House, Illinois District 15 Republican Primary, 2016

Candidate	Vote %	Votes
John Shimkus Incumbent	60.4%	76,547
Kyle McCarter	39.6%	50,245
Total Votes		126,792
Source: Illinois State Board of Elections

2014

See also: Illinois' 15th Congressional District elections, 2014

The 15th Congressional District of Illinois held an election for the U.S. House of Representatives on November 4, 2014. Incumbent John Shimkus (R) defeated challenger Eric Thorsland (D) in the general election.

U.S. House, Illinois District 15 General Election, 2014

Party		Candidate	Vote %	Votes
	Republican	John Shimkus Incumbent	74.9%	166,274
	Democratic	Eric Thorsland	25.1%	55,652
Total Votes				221,926
Source: Illinois State Board of Elections Official Results

General election candidates

• John Shimkus - Incumbent
• Eric Thorsland

March 18, 2014, primary results

Republican Primary

• John Shimkus - Incumbenta

Democratic Primary

• Eric Thorslanda

2012

See also: Illinois' 15th congressional district elections, 2012

The 15th Congressional District of Illinois held an election for the U.S. House of Representatives on November 6, 2012. Incumbent from District 19 John Shimkus won election in the district.

U.S. House, Illinois District 15 General Election, 2012

Party		Candidate	Vote %	Votes
	Republican	John Shimkus Incumbent	68.6%	205,775
	Democratic	Angela Michael	31.4%	94,162
Total Votes				299,937
Source: Illinois Board of Elections "2012 General Election Official Vote Totals"

2010
On November 2, 2010, Timothy V. Johnson won re-election to the United States House. He defeated David Gill (D) in the general election.

U.S. House, Illinois District 15 General Election, 2010
Party		Candidate	Vote %	Votes
	Republican	Timothy V. Johnson incumbent	64.3%	136,915
	Democratic	David Gill	35.7%	75,948
Total Votes				212,863

2008
On November 4, 2008, Timothy V. Johnson won re-election to the United States House. He defeated Steve Cox (D) in the general election.

U.S. House, Illinois District 15 General Election, 2008
Party		Candidate	Vote %	Votes
	Republican	Timothy V. Johnson incumbent	64.2%	187,121
	Democratic	Steve Cox	35.8%	104,393
Total Votes				291,514

2006
On November 7, 2006, Timothy V. Johnson won re-election to the United States House. He defeated David Gill (D) in the general election.

U.S. House, Illinois District 15 General Election, 2006
Party		Candidate	Vote %	Votes
	Republican	Timothy V. Johnson incumbent	57.6%	116,810
	Democratic	David Gill	42.4%	86,025
Total Votes				202,835

2004
On November 2, 2004, Timothy V. Johnson won re-election to the United States House. He defeated David Gill (D) in the general election.

U.S. House, Illinois District 15 General Election, 2004
Party		Candidate	Vote %	Votes
	Republican	Timothy V. Johnson incumbent	61.1%	178,114
	Democratic	David Gill	38.9%	113,625
Total Votes				291,739

2002
On November 5, 2002, Timothy V. Johnson won re-election to the United States House. He defeated Joshua T. Hartke (D) and Carl Estabrook (Illinois Green Party) in the general election.

U.S. House, Illinois District 15 General Election, 2002
Party		Candidate	Vote %	Votes
	Republican	Timothy V. Johnson incumbent	65.2%	134,650
	Democratic	Joshua T. Hartke	31%	64,131
	Green	Carl Estabrook	3.8%	7,836
Total Votes				206,617

2000
On November 7, 2000, Timothy V. Johnson won election to the United States House. He defeated F. Michael "Mike" Kelleher, Jr. (D) in the general election.

U.S. House, Illinois District 15 General Election, 2000
Party		Candidate	Vote %	Votes
	Republican	Timothy V. Johnson	53.2%	125,943
	Democratic	F. Michael "Mike" Kelleher, Jr.	46.8%	110,679
Total Votes				236,622

Redistricting

2020-2021

See also: Redistricting in Illinois after the 2020 census

Illinois enacted a congressional map on November 24, 2021, after Gov. J.B. Pritzker (D) signed the proposal into law. The Illinois State Senate voted 41-18 in favor of the map on October 28, 2021, followed by the Illinois House of Representatives voting 71-43 in favor on October 29, 2021.

How does redistricting in Illinois work? The Illinois General Assembly is responsible for drawing both congressional and state legislative district lines. Both chambers of the state legislature must approve a redistricting plan. The governor may veto the lines drawn by the state legislature.

In the event that both chambers of the state legislature do not approve a legislative redistricting plan, a backup commission must draw the lines. The majority and minority leaders of each chamber must appoint two members each to the commission (one legislator and one general citizen). Of the eight commission members, no more than four may belong to the same political party. In the event that these eight members cannot approve a plan, the Illinois Supreme Court must select two individuals (from different political parties) as potential tiebreakers. The secretary of state must then appoint one of these individuals to the backup commission to break the tie.

The Illinois Constitution requires that state legislative districts be "contiguous and reasonably compact." There are no such requirements in place for the state's congressional districts.

State law also mandates the establishment of state legislative districts "that allow racial or language minority communities to elect--or influence the election of--the candidates of their choice, even if no comparable district would be required by the federal Voting Rights Act."

Illinois District 15
until January 2, 2023

Click a district to compare boundaries.

Illinois District 15
starting January 3, 2023

Click a district to compare boundaries.

2010-2011

This is the 15th Congressional District of Illinois after the 2001 redistricting process.

See also: Redistricting in Illinois after the 2010 census

In 2011, the Illinois State Legislature re-drew the congressional districts based on updated population information from the 2010 census.

District analysis

See also: The Cook Political Report's Partisan Voter Index

See also: FiveThirtyEight's elasticity scores

2026

Heading into the 2026 elections, based on results from the 2024 and 2020 presidential elections, the Cook Partisan Voter Index for this district is R+20. This meant that in those two presidential elections, this district's results were 20 percentage points more Democratic than the national average. This made Illinois' 15th the 32nd most Democratic district nationally.

2024

Heading into the 2024 elections, based on results from the 2020 and 2016 presidential elections, the Cook Partisan Voter Index for this district was R+22. This meant that in those two presidential elections, this district's results were 22 percentage points more Republican than the national average. This made Illinois' 15th the 29th most Republican district nationally.

Daily Kos calculated what the results of the 2020 presidential election in this district would have been following redistricting. Donald Trump (R) would have defeated Joe Biden (D) 68.3%-29.6%.

2022

Heading into the 2022 elections, based on results from the 2020 and 2016 presidential elections, the Cook Partisan Voter Index for this district was R+22. This meant that in those two presidential elections, this district's results were 22 percentage points more Republican than the national average. This made Illinois' 15th the 26th most Republican district nationally.

Daily Kos calculated what the results of the 2020 presidential election in this district would have been following redistricting. Joe Biden (D) would have received 29.6% of the vote in this district and Donald Trump (R) would have received 68.3%.

2018

Heading into the 2018 elections, based on results from the 2016 and 2012 presidential elections, the Cook Partisan Voter Index for this district was R+21. This meant that in those two presidential elections, this district's results were 21 percentage points more Republican than the national average. This made Illinois' 15th Congressional District the 29th most Republican nationally.

FiveThirtyEight's September 2018 elasticity score for states and congressional districts measured "how sensitive it is to changes in the national political environment." This district's elasticity score was 1.10. This means that for every 1 point the national political mood moved toward a party, the district was expected to move 1.10 points toward that party.

See also

• Redistricting in Illinois
• Illinois' 15th Congressional District election, 2024
• Illinois' 15th Congressional District election, 2022
• Illinois' 15th Congressional District election, 2020
• Illinois' 15th Congressional District election, 2018

External links

• GovTrack District 15

Footnotes

[show]

Illinois' current delegation to the United States Congress

Senators

Tammy Duckworth (D)

Dick Durbin (D)

Representatives

District 1

Jonathan Jackson (D)

District 2

Robin Kelly (D)

District 3

Delia Ramirez (D)

District 4

Jesus Garcia (D)

District 5

Mike Quigley (D)

District 6

Sean Casten (D)

District 7

Danny Davis (D)

District 8

Raja Krishnamoorthi (D)

District 9

Jan Schakowsky (D)

District 10

Brad Schneider (D)

District 11

Bill Foster (D)

District 12

Mike Bost (R)

District 13

Nikki Budzinski (D)

District 14

Lauren Underwood (D)

District 15

Mary Miller (R)

District 16

Darin LaHood (R)

District 17

Eric Sorensen (D)

Democratic Party (16)

Republican Party (3)