Comparison of state delegations to Congress, 2018-present

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Congressional Analysis Archive
Margins of victory
Congressional margin of victory analyses Congressional elections decided by 10 percentage points or fewer Minor-party candidates who won more than the margin of victory
Incumbents
U.S. Congress incumbents who did not run for re-election Incumbents defeated in congressional elections Incumbent win rates by state Results of federal elected officials seeking other offices
Battlegrounds
U.S. Senate battlegrounds U.S. House battlegrounds
Other analysis
New members elected in congressional elections U.S. House elections without a Democratic or Republican candidate States with both gubernatorial and U.S. Senate elections • Comparison of state delegations to Congress
2024 Election Analysis Hub

This page compiles yearly analysis of state delegations to Congress, including the percentage of new members, partisan composition, and partisan shifts. Both U.S. Senate and U.S. House members are included in each state's congressional delegation.

Incumbents defeated in elections, appointments to state and executive offices, resignations, and retirements all contribute to changes in the composition of congressional delegations. This page contains excerpts of and links to each analysis since 2018.

Click a year below to read analysis from that year:

• 2024
• 2022
• 2020
• 2018

2024

See also: Election results, 2024: Comparison of state delegations to the 118th and 119th Congresses

This chart shows the percentage of new U.S. Senate and U.S. House members in each state's delegation in the 119th Congress compared to the end of the 118th Congress. Independents who caucused with Democrats were counted as Democrats.

This chart compares the partisan composition of each state delegation at the end of the 118th Congress to the beginning of the 119th Congress. Independents who caucused with Democrats were counted as Democrats. At the end of the 118th Congress, Republicans controlled 270 congressional seats to Democrats' 265. At the beginning of the 119th Congress, Republicans held 273 total congressional seats to Democrats' 262.

Click here to read more from the 2024 analysis.

2022

See also: Election results, 2022: Comparison of state delegations to the 117th and 118th Congresses

This chart below compares the partisan composition of each state delegation at the end of the 117th Congress and the start of the 118th Congress.

This chart shows the percentage of new U.S. Senate and U.S. House members in each state's delegation at the start of the 118th Congress compared to the end of the 117th Congress. Independents who caucused with Democrats were counted as Democrats. The chart also shows the districts states gained or lost due to apportionment after the 2020 census.

Click here to read more from the 2022 analysis.

2020

See also: Election results, 2020: Comparison of state delegations to the 116th and 117th Congresses

This chart shows the percentage of new U.S. Senate and U.S. House members in each state's delegation in the 117th Congress compared to the start of the 116th Congress. Independents who caucused with Democrats were counted as Democrats.

This chart compares the partisan composition of each state delegation at the start of the 116th Congress to the 117th Congress. Independents who caucused with Democrats were counted as Democrats. At the opening of the 117th Congress, Democrats controlled 273 congressional seats to Republicans' 262. At the beginning of the 116th Congress, Democrats held 282 total congressional seats to Republicans' 253.

Click here to read more from the 2020 analysis.

2018

See also: Election results, 2018: Comparison of state delegations to the 115th and 116th Congresses

This chart shows the percentage of new U.S. Senate and U.S. House members in each state's delegation in the 116th Congress compared to the start of the 115th Congress. Independents who caucused with Democrats were counted as Democrats.

This chart compares the partisan composition of each state delegation at the start of the 115th Congress to the 116th Congress. Independents who caucused with Democrats were counted as Democrats.

Click here to read more from the 2018 analysis.

See also

• Congressional Analysis Archive
• Ballotpedia's Election Analysis Hub, 2024

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