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United States · Election results history · 1978 Senate · Illinois
Election 1978 Results

Each election opens in its own mode: the forecast before the votes are counted, the live count while races are still too close to call, and the results once every race is decided.

1978 US Senate election in Illinois

Charles H. Percy (Republican) beat Alex Seith (Democrat) in Illinois in 1978, 53.3% to 45.5%, a margin of 7.9 points and 250,524 votes.

The Republican hold continued from 1972, when Charles H. Percy also won.

Republicans led in 63 of the 102 counties as they stood then and Democrats in 39. The largest, Cook, cast 1,530,684 votes and went to the Republican by 4.7 points. The closest was Bond, where 5 votes separated the two parties.

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Early projection, based on early and incomplete polling: the likely matchups, each weighted by the betting markets' odds of both nominations, not a result. Each county is its 2024 presidential margin moved by its state's projected swing; set a national vote and every state, district and county moves by the same amount from our projection. Colours run in 100 steps from a safe Republican to a safe Democratic margin. Boundaries: US Census Bureau.

Senate

CandidatePartyVotesShare
Charles H. Percy won Republican 1,698,711 53.3%
Alex Seith Democratic 1,448,187 45.5%
All other candidates 37,866 1.2%
Total3,184,764

Every county

CountyDemocratRepublicanOthersTotalMargin
Cook 719,986 47.0% 791,501 51.7% 19,197 1,530,684 R+4.7
Du Page 49,606 29.6% 115,197 68.8% 2,573 167,376 R+39.2
Lake 35,400 33.6% 68,435 64.9% 1,590 105,425 R+31.3
Will 33,302 44.3% 41,219 54.8% 664 75,185 R+10.5
Kane 24,749 38.7% 37,887 59.3% 1,296 63,932 R+20.5
Sangamon 31,892 50.4% 30,991 48.9% 436 63,319 D+1.4
Winnebago 27,684 44.5% 33,491 53.9% 977 62,152 R+9.3
St. Clair 37,040 60.7% 23,074 37.8% 935 61,049 D+22.9
Madison 31,102 55.5% 24,589 43.9% 344 56,035 D+11.6
Peoria 20,604 41.9% 27,640 56.2% 907 49,151 R+14.3
Rock Island 18,370 44.3% 22,641 54.6% 483 41,494 R+10.3
Champaign 11,867 31.9% 24,699 66.4% 655 37,221 R+34.5
McHenry 11,460 32.6% 23,158 65.9% 515 35,133 R+33.3
Tazewell 14,873 44.2% 18,278 54.3% 510 33,661 R+10.1
Macon 15,629 47.8% 16,807 51.4% 269 32,705 R+3.6
La Salle 15,445 47.6% 16,685 51.4% 345 32,475 R+3.8
McLean 11,632 37.8% 18,991 61.7% 167 30,790 R+23.9
Kankakee 12,862 43.8% 16,100 54.8% 404 29,366 R+11.0
Vermilion 14,428 52.5% 12,600 45.9% 428 27,456 D+6.7
Adams 9,452 47.8% 10,092 51.1% 213 19,757 R+3.2
De Kalb 5,512 31.3% 11,839 67.2% 254 17,605 R+35.9
Knox 7,478 44.2% 9,118 53.9% 319 16,915 R+9.7
Williamson 8,389 50.5% 8,096 48.7% 127 16,612 D+1.8
Macoupin 9,393 58.0% 6,684 41.3% 116 16,193 D+16.7
Whiteside 6,677 45.2% 7,928 53.7% 152 14,757 R+8.5
Jackson 6,127 42.2% 8,188 56.4% 199 14,514 R+14.2
Henry 5,999 42.5% 7,983 56.5% 144 14,126 R+14.0
Coles 6,739 50.2% 6,530 48.6% 164 13,433 D+1.6
Morgan 6,118 46.4% 6,975 52.8% 105 13,198 R+6.5
Franklin 7,639 59.0% 5,280 40.8% 33 12,952 D+18.2
Randolph 7,355 57.2% 5,498 42.7% 12 12,865 D+14.4
Fulton 6,169 48.4% 6,465 50.7% 122 12,756 R+2.3
Bureau 5,599 44.6% 6,849 54.5% 109 12,557 R+10.0
Iroquois 5,235 44.0% 6,645 55.8% 29 11,909 R+11.8
Montgomery 6,809 57.3% 5,050 42.5% 28 11,887 D+14.8
Stephenson 4,467 38.5% 7,042 60.6% 108 11,617 R+22.2
Marion 6,240 54.3% 5,060 44.0% 198 11,498 D+10.3
Livingston 3,862 35.7% 6,871 63.6% 78 10,811 R+27.8
Ogle 4,674 43.6% 5,846 54.6% 190 10,710 R+10.9
Christian 6,319 59.3% 4,252 39.9% 79 10,650 D+19.4
Grundy 4,650 44.7% 5,674 54.6% 76 10,400 R+9.8
Logan 4,653 45.7% 5,526 54.2% 13 10,192 R+8.6
Jefferson 5,104 50.4% 4,808 47.5% 214 10,126 D+2.9
Clinton 5,469 54.2% 4,518 44.8% 97 10,084 D+9.4
Lee 4,872 51.8% 4,392 46.7% 146 9,410 D+5.1
Effingham 4,938 54.0% 4,157 45.4% 57 9,152 D+8.5
Saline 4,659 51.3% 4,343 47.8% 75 9,077 D+3.5
Perry 4,292 47.6% 4,715 52.3% 5 9,012 R+4.7
Woodford 3,640 40.4% 5,229 58.0% 140 9,009 R+17.6
Kendall 3,785 42.3% 5,112 57.2% 45 8,942 R+14.8
Fayette 4,705 55.0% 3,823 44.7% 20 8,548 D+10.3
Shelby 4,584 56.8% 3,418 42.4% 64 8,066 D+14.5
Crawford 3,224 40.2% 4,771 59.5% 18 8,013 R+19.3
Edgar 3,599 45.4% 4,313 54.4% 15 7,927 R+9.0
McDonough 2,947 37.3% 4,849 61.4% 107 7,903 R+24.1
Wayne 3,556 49.1% 3,658 50.5% 26 7,240 R+1.4
Boone 2,962 42.0% 3,997 56.7% 89 7,048 R+14.7
Monroe 3,334 48.0% 3,573 51.5% 37 6,944 R+3.4
White 3,266 47.5% 3,574 52.0% 38 6,878 R+4.5
Jersey 3,391 50.5% 3,259 48.6% 59 6,709 D+2.0
Pike 3,600 54.6% 2,954 44.8% 42 6,596 D+9.8
Mercer 2,955 44.8% 3,611 54.8% 23 6,589 R+10.0
Piatt 2,847 44.6% 3,509 55.0% 23 6,379 R+10.4
Union 3,505 55.6% 2,748 43.6% 55 6,308 D+12.0
Jo Daviess 2,502 40.6% 3,594 58.4% 59 6,155 R+17.7
Hancock 2,848 46.3% 3,276 53.3% 26 6,150 R+7.0
Douglas 2,926 48.4% 3,104 51.3% 16 6,046 R+2.9
Clark 2,842 47.7% 3,071 51.5% 49 5,962 R+3.8
Bond 2,854 50.0% 2,849 49.9% 4 5,707 D+0.1
Washington 2,529 44.9% 3,085 54.8% 19 5,633 R+9.9
Lawrence 2,122 38.3% 3,405 61.4% 19 5,546 R+23.1
Massac 3,226 58.3% 2,304 41.6% 5 5,535 D+16.7
Richland 2,312 42.0% 3,178 57.7% 17 5,507 R+15.7
Greene 2,684 50.5% 2,602 48.9% 34 5,320 D+1.5
Warren 1,954 37.1% 3,183 60.4% 132 5,269 R+23.3
Clay 2,553 48.7% 2,675 51.0% 16 5,244 R+2.3
Carroll 2,160 42.7% 2,862 56.5% 41 5,063 R+13.9
Cass 2,677 53.6% 2,309 46.2% 10 4,996 D+7.4
De Witt 2,244 45.3% 2,678 54.0% 36 4,958 R+8.8
Mason 2,394 49.3% 2,412 49.6% 54 4,860 R+0.4
Ford 1,928 39.7% 2,919 60.1% 9 4,856 R+20.4
Moultrie 2,584 55.2% 2,082 44.5% 11 4,677 D+10.7
Marshall 2,045 43.8% 2,581 55.3% 44 4,670 R+11.5
Alexander 2,612 58.1% 1,833 40.8% 48 4,493 D+17.3
Jasper 2,422 55.3% 1,949 44.5% 6 4,377 D+10.8
Cumberland 2,299 53.0% 2,011 46.4% 28 4,338 D+6.6
Wabash 1,564 36.5% 2,684 62.6% 37 4,285 R+26.1
Hamilton 2,235 52.6% 2,006 47.2% 12 4,253 D+5.4
Menard 2,036 48.6% 2,134 51.0% 18 4,188 R+2.3
Johnson 1,897 50.6% 1,852 49.4% 3 3,752 D+1.2
Schuyler 1,917 51.3% 1,817 48.6% 6 3,740 D+2.7
Henderson 1,799 48.3% 1,894 50.8% 35 3,728 R+2.5
Pulaski 1,722 50.2% 1,696 49.5% 11 3,429 D+0.8
Edwards 1,240 38.0% 2,015 61.7% 10 3,265 R+23.7
Gallatin 1,605 55.4% 1,280 44.2% 10 2,895 D+11.2
Stark 1,098 40.3% 1,602 58.9% 22 2,722 R+18.5
Putnam 1,358 51.4% 1,252 47.4% 30 2,640 D+4.0
Scott 1,280 48.6% 1,351 51.3% 5 2,636 R+2.7
Hardin 1,366 52.9% 1,208 46.8% 8 2,582 D+6.1
Brown 1,373 57.5% 1,010 42.3% 4 2,387 D+15.2
Calhoun 1,244 52.4% 1,122 47.3% 6 2,372 D+5.1
Pope 1,016 49.7% 1,021 49.9% 8 2,045 R+0.2

Counties as they stood in 1978; some have since been split, merged or renamed. Margin: the Democrat's share of all votes minus the Republican's. Sources and how the results were checked.

Illinois Senate elections we hold

YearWinnerMargin
2022 Tammy Duckworth (D) D+15.3
2020 Richard J Durbin (D) D+16.0
2016 Tammy Duckworth (D) D+15.1
2014 Dick Durbin (D) D+10.9
2010 Mark Kirk (R) R+1.6
2008 Richard J. Durbin (D) D+39.3
2004 Barack Obama (D) D+42.9
2002 Richard J. Durbin (D) D+22.3
1998 Peter G. Fitzgerald (R) R+2.9
1996 Richard J. Durbin (D) D+15.4
1992 Carol Moseley-Braun (D) D+10.2
1990 Paul Simon (D) D+30.1
1986 Alan J. Dixon (D) D+31.4
1984 Paul Simon (D) D+1.9
1980 Alan J. Dixon (D) D+13.5
1978 Charles H. Percy (R) R+7.9
1974 Adlai Stevenson III (D) D+24.9
1972 Charles H. Percy (R) R+24.9
1968 Everett Dirksen (R) R+6.4
1966 Charles H. Percy (R) R+11.0
1962 Everett Dirksen (R) R+5.7
1960 Paul H. Douglas (D) D+9.4
1956 Everett Dirksen (R) R+8.4
1954 Paul H. Douglas (D) D+7.1
1950 Everett Dirksen (R) R+8.1
1948 Paul H. Douglas (D) D+10.5
1944 Scott W. Lucas (D) D+5.6
1942 C. Wayland Brooks (R) R+6.8
1938 Scott W. Lucas (D) D+3.0
1936 James H. Lewis (D) D+15.8
1932 William H. Dieterich (D) D+6.2
1930 James H. Lewis (D) D+33.3
1926 Frank L. Smith (R) R+3.7
1924 Charles S. Deneen (R) R+28.2
1920 William B. McKinley (R) R+40.0
1918 Medill McCormick (R) R+5.6
1914 Lawrence Y. Sherman (R) R+1.7