The 1990 Senate map

35 Senate contests were decided in 1990: Democrats won 18, Republicans 17. 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

35

Democratic wins

18

Republican wins

17

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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	−34.6%	61,152	125,806	186,958
Alabama	D	+21.1%	717,814	467,190	1,185,004
Arkansas	D	+100.0%	493,910	0	493,910
Colorado	R	−14.0%	425,746	569,048	1,022,027
Delaware	D	+26.8%	112,918	64,554	180,152
Georgia	D	+100.0%	1,033,439	0	1,033,439
Hawaii	D	+9.4%	188,901	155,978	349,666
Iowa	D	+9.1%	535,975	446,869	983,933
Idaho	R	−22.6%	122,295	193,641	315,936
Illinois	D	+30.1%	2,115,377	1,135,628	3,251,005
Indiana	R	−7.3%	696,639	806,048	1,502,687
Kansas	R	−47.2%	207,491	578,605	786,096
Kentucky	R	−4.4%	437,976	478,034	916,010
Louisiana	D	+100.0%	1	0	1
Massachusetts	D	+13.6%	1,321,712	992,917	2,424,579
Maine	R	−22.7%	201,053	319,167	520,320
Michigan	D	+16.3%	1,471,753	1,055,695	2,560,244
Minnesota	D	+2.6%	911,999	864,375	1,806,194
Mississippi	R	−100.0%	0	274,244	274,244
Montana	D	+38.7%	217,563	93,836	319,336
North Carolina	R	−5.1%	981,573	1,087,331	2,068,904
Nebraska	D	+18.0%	349,779	243,013	592,792
New Hampshire	R	−33.9%	91,299	189,792	290,808
New Jersey	D	+3.0%	977,810	918,874	1,938,454
New Mexico	R	−45.9%	110,033	296,712	406,745
Oklahoma	D	+66.4%	735,684	148,814	884,498
Oregon	R	−7.5%	507,743	590,095	1,099,255
Rhode Island	D	+23.7%	225,105	138,947	364,052
South Carolina	R	−31.7%	244,112	482,032	750,266
South Dakota	R	−7.3%	116,727	135,682	258,976
Tennessee	D	+37.9%	530,898	233,703	783,813
Texas	R	−22.8%	1,429,986	2,302,357	3,821,432
Virginia	R	−81.7%	0	876,782	1,073,537
West Virginia	D	+36.6%	276,234	128,071	404,305
Wyoming	R	−27.9%	56,848	100,784	157,632