The 1986 Senate map

34 Senate contests were decided in 1986: Democrats won 20, Republicans 14. 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

20

Republican wins

14

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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	−9.9%	79,727	97,674	180,562
Alabama	D	+0.6%	609,360	602,537	1,211,897
Arkansas	D	+24.6%	433,122	262,313	695,435
Arizona	R	−21.0%	340,965	521,850	862,815
California	D	+1.4%	3,646,672	3,541,804	7,398,462
Colorado	D	+1.6%	529,449	512,994	1,060,765
Connecticut	D	+29.9%	632,695	340,438	976,933
Florida	D	+9.5%	1,877,543	1,552,376	3,429,919
Georgia	D	+1.8%	623,707	601,241	1,224,948
Hawaii	D	+47.1%	241,887	86,910	328,797
Iowa	R	−32.5%	299,406	588,880	891,762
Idaho	R	−3.1%	185,066	196,958	382,024
Illinois	D	+31.4%	2,033,783	1,053,734	3,122,883
Indiana	R	−22.1%	595,192	936,143	1,545,563
Kansas	R	−40.1%	246,664	576,902	823,566
Kentucky	D	+48.8%	503,775	173,330	677,105
Louisiana	D	+5.6%	723,586	646,311	1,369,897
Maryland	D	+21.4%	675,225	437,411	1,112,636
Missouri	R	−5.3%	699,624	777,612	1,477,327
North Carolina	D	+1.8%	780,967	753,881	1,534,848
North Dakota	D	+0.7%	143,932	141,812	289,013
New Hampshire	R	−30.6%	79,222	154,090	244,735
Nevada	D	+5.5%	130,955	116,606	261,932
New York	R	−6.8%	1,723,216	2,030,260	4,484,859
Ohio	D	+24.9%	1,949,208	1,171,893	3,121,101
Oklahoma	R	−10.4%	400,230	493,436	893,666
Oregon	R	−26.9%	375,735	656,317	1,042,555
Pennsylvania	R	−13.6%	1,448,219	1,906,537	3,378,226
South Carolina	D	+27.5%	465,500	262,886	737,763
South Dakota	D	+3.2%	152,657	143,173	295,830
Utah	R	−45.8%	115,523	314,608	435,017
Vermont	D	+28.7%	124,123	67,798	196,532
Washington	D	+2.0%	677,471	650,931	1,337,367
Wisconsin	R	−3.5%	702,963	754,573	1,483,174