Elections to the 109th United States House of Representatives were held on November 2, 2004. The House of Representatives has 435 seats; in the 108th Congress, Republicans held 227 seats, Democrats held 205, with two Republican vacancies and one independent. As a consequence of this election, the 109th United States House of Representatives will be composed of 232 Republicans, 202 Democrats and one independent, Bernard Sanders of Vermont (who usually votes with the Democrats). The Republicans built up their House majority by 3 seats (gaining 7 but losing 4).

Of the seven gross seats the Republicans gained, five can be attributed to a special redistricting plan in Texas led by Republican Representative Tom DeLay. His redistricting plan was put into action, turning five Democratic seats Republican. A mid-decade redistricting like this was unprecedented and controversial.

Outside of Texas, Democrats gained two seats net, gaining open seats in Colorado and New York and ousting incumbents in Georgia and Illinois. Republicans gained an open seat in Kentucky and ousted an incumbent in Indiana. A pair of seats in Louisiana swapped party control.

On the same date occurred:

• the U.S. Presidential election, 2004
• the U.S. Senate election, 2004

Table showing incumbents for each district by party

Voting members

Key to party abbreviations: C=Constitution, D=Democrat, G=Green, I=Independent, IP=Independence Party, L=Libertarian, R=Republican

Alabama

Alaska

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

Florida

Georgia

Hawaii

Idaho

Illinois

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