The 2020 Senate map

34 Senate contests were decided in 2020: Democrats won 13, Republicans 21. 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

13

Republican wins

21

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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	−12.7%	146,068	191,112	353,986
Alabama	R	−20.4%	920,478	1,392,076	2,312,554
Arkansas	R	−66.5%	0	793,871	1,193,261
Arizona	D	+2.3%	1,716,634	1,638,060	3,355,307
Colorado	D	+9.3%	1,731,114	1,429,492	3,235,790
Delaware	D	+21.5%	291,804	186,054	490,935
Georgia	R	−1.8%	2,374,519	2,462,617	4,952,175
Iowa	R	−6.6%	754,859	864,997	1,670,617
Idaho	R	−29.4%	285,864	538,446	859,827
Illinois	D	+16.1%	3,278,930	2,319,870	5,968,901
Kansas	R	−11.4%	571,530	727,962	1,367,755
Kentucky	R	−19.5%	816,257	1,233,315	2,135,057
Louisiana	R	−25.9%	730,989	1,267,291	2,071,543
Massachusetts	D	+33.2%	2,357,809	1,177,765	3,556,708
Maine	R	−8.6%	347,223	417,645	818,955
Michigan	D	+1.7%	2,734,568	2,642,233	5,479,720
Minnesota	D	+5.2%	1,566,522	1,398,145	3,211,995
Mississippi	R	−10.0%	578,691	709,511	1,311,354
Montana	R	−10.0%	272,463	333,174	605,637
North Carolina	R	−1.7%	2,569,965	2,665,598	5,474,952
Nebraska	R	−38.6%	227,191	583,507	924,224
New Hampshire	D	+15.7%	450,778	326,229	795,428
New Jersey	D	+16.3%	2,541,178	1,817,052	4,440,440
New Mexico	D	+6.1%	474,483	418,483	917,237
Oklahoma	R	−30.2%	509,763	979,140	1,556,361
Oregon	D	+17.6%	1,321,047	912,814	2,318,847
Rhode Island	D	+33.2%	328,574	164,855	493,429
South Carolina	R	−10.3%	1,110,828	1,369,137	2,512,810
South Dakota	R	−31.5%	143,987	276,232	420,219
Tennessee	R	−27.0%	1,040,691	1,840,926	2,959,761
Texas	R	−9.6%	4,888,764	5,962,983	11,144,040
Virginia	D	+12.1%	2,466,500	1,934,199	4,400,699
West Virginia	R	−43.3%	210,309	547,454	778,918
Wyoming	R	−46.3%	72,766	198,100	270,866