The 2004 Senate map

34 Senate contests were decided in 2004: Democrats won 15, Republicans 19. Every contest below links to its page with the state's full Senate history.

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Cycle summary

Wins by party — seats decided this cycle, not the resulting chamber balance.

Contests

34

Democratic wins

15

Republican wins

19

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Every contest

Statewide totals; candidate-level detail joins when the raw store is re-fetched with names.

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State	Won	Margin	Democratic	Republican	Total
Alaska	R	−3.0%	140,424	149,773	307,892
Alabama	R	−35.2%	595,018	1,242,200	1,837,218
Arkansas	D	+11.8%	580,973	458,036	1,039,221
Arizona	R	−56.1%	404,507	1,505,372	1,961,677
California	D	+19.9%	6,955,728	4,555,922	12,053,242
Colorado	D	+4.8%	1,081,188	980,668	2,107,472
Connecticut	D	+34.2%	945,347	457,749	1,424,726
Florida	R	−1.1%	3,590,201	3,672,864	7,429,707
Georgia	R	−17.9%	1,287,690	1,864,202	3,220,943
Hawaii	D	+54.5%	313,629	87,172	415,347
Iowa	R	−42.3%	412,365	1,038,175	1,478,753
Idaho	R	−100.0%	0	499,796	499,796
Illinois	D	+42.9%	3,597,456	1,390,690	5,138,563
Indiana	D	+24.4%	1,496,976	903,913	2,428,233
Kansas	R	−41.7%	310,337	780,863	1,129,022
Kentucky	R	−1.3%	850,855	873,507	1,724,362
Louisiana	R	−3.5%	877,482	943,014	1,848,056
Maryland	D	+31.1%	1,504,691	783,055	2,321,571
Missouri	R	−13.3%	1,158,261	1,518,089	2,706,402
North Carolina	R	−4.6%	1,632,527	1,791,450	3,471,720
North Dakota	D	+36.6%	212,143	98,553	310,696
New Hampshire	R	−32.5%	221,549	434,847	656,396
Nevada	D	+25.9%	494,805	284,640	810,068
New York	D	+41.2%	4,384,907	1,625,069	6,702,875
Ohio	R	−27.7%	1,961,171	3,464,356	5,425,527
Oklahoma	R	−11.5%	596,750	763,433	1,446,846
Oregon	D	+31.6%	1,128,728	565,254	1,780,550
Pennsylvania	R	−10.6%	2,334,126	2,925,080	5,558,525
South Carolina	R	−9.6%	704,384	857,167	1,595,935
South Dakota	R	−1.2%	193,340	197,848	391,188
Utah	R	−40.7%	258,955	626,640	902,884
Vermont	D	+46.1%	216,972	75,398	307,034
Washington	D	+12.2%	1,549,708	1,204,584	2,818,651
Wisconsin	D	+11.2%	1,632,697	1,301,183	2,948,909