The 1998 Senate map

34 Senate contests were decided in 1998: Democrats won 18, Republicans 16. 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

18

Republican wins

16

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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	−54.9%	43,743	165,227	221,142
Alabama	R	−26.6%	474,568	817,973	1,292,541
Arkansas	D	+12.8%	385,878	295,870	700,644
Arizona	R	−41.6%	275,224	696,577	1,013,093
California	D	+10.0%	4,410,056	3,575,078	8,311,905
Colorado	R	−27.5%	464,754	829,370	1,327,235
Connecticut	D	+32.8%	628,306	312,177	964,457
Florida	D	+24.9%	2,436,407	1,463,755	3,900,162
Georgia	R	−7.2%	791,904	918,540	1,753,911
Hawaii	D	+61.4%	315,252	70,964	398,124
Iowa	R	−37.9%	289,049	648,480	947,632
Idaho	R	−41.1%	107,375	262,966	378,174
Illinois	R	−2.9%	1,610,496	1,709,041	3,394,521
Indiana	D	+28.9%	1,012,244	552,732	1,588,617
Kansas	R	−33.7%	229,718	474,639	727,236
Kentucky	R	−0.6%	563,051	569,817	1,145,414
Louisiana	D	+32.6%	630,395	314,580	969,165
Maryland	D	+41.0%	1,062,810	444,637	1,507,447
Missouri	R	−8.9%	690,208	830,625	1,576,857
North Carolina	D	+4.1%	1,029,237	945,943	2,012,143
North Dakota	D	+28.0%	134,747	75,013	213,358
New Hampshire	R	−39.6%	88,883	213,477	314,696
Nevada	D	+0.1%	208,621	208,220	435,864
New York	D	+15.1%	2,386,314	1,680,203	4,670,805
Ohio	R	−12.9%	1,482,054	1,922,087	3,404,141
Oklahoma	R	−35.1%	268,898	570,682	859,713
Oregon	D	+27.3%	682,425	377,739	1,117,747
Pennsylvania	R	−26.6%	1,028,839	1,814,180	2,957,499
South Carolina	D	+7.0%	563,377	488,238	1,068,606
South Dakota	D	+25.7%	162,884	95,431	262,111
Utah	R	−31.0%	163,172	316,652	494,897
Vermont	D	+49.9%	154,567	48,051	213,407
Washington	D	+16.8%	1,103,184	785,377	1,888,561
Wisconsin	D	+2.1%	890,059	852,272	1,760,130