Ronald Reagan carried Illinois R+12.9.

Walter Mondale (D) vs Ronald Reagan (R) in Illinois, 1984. The state ran 5.3 points more Democratic than the nation (R+18.2 nationally). A US Senate contest shared the 1984 ballot here.

Nominees: Walter Mondale (D) · Ronald Reagan (R)

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Illinois result

4,819,088 votes counted

Mondale (D)

2,086,499

43.3%

Reagan (R)

2,707,103

56.2%

All others

25,486

0.5%

Margin

R+12.9

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1984 presidential election

Illinois, 1984

ReaganR+12.9

How it voted

Share of the 1984 vote

Ronald Reagan ✓Republican	56.2%	2,707,103
Walter MondaleDemocratic	43.3%	2,086,499
OtherAll other candidates	0.5%	25,486

D+60

R+60

102 counties, each filled by 1984 D-vs-R margin. Hover any county for its result.

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Illinois's presidential margins

1892–2024, the 1984 contest in context

Illinois's presidential margins

Year	Margin (D minus R)
1892	+3.1%
1896	−13.0%
1900	−8.4%
1904	−28.3%
1908	−15.5%
1912	+13.2%
1916	−9.2%
1920	−42.3%
1924	−35.5%
1928	−14.7%
1932	+13.2%
1936	+18.0%
1940	+2.4%
1944	+3.5%
1948	+0.8%
1952	−9.9%
1956	−19.2%
1960	+0.2%
1964	+18.9%
1968	−2.9%
1972	−18.5%
1976	−2.0%
1980	−7.9%
1984	−12.9%
1988	−2.1%
1992	+14.2%
1996	+17.5%
2000	+12.0%
2004	+10.3%
2008	+25.1%
2012	+16.8%
2016	+16.9%
2020	+16.9%
2024	+10.9%

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County results — 1984

102 counties; every row links to the county's full page.

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County	Won	Margin	Democratic	Republican	Total
Adams County	R	−32.3%	10,336	20,225	30,649
Alexander County	D	+5.5%	2,872	2,574	5,467
Bond County	R	−19.2%	2,870	4,240	7,131
Boone County	R	−33.8%	3,717	7,536	11,306
Brown County	R	−21.2%	959	1,478	2,446
Bureau County	R	−25.7%	6,925	11,741	18,765
Calhoun County	R	−6.6%	1,443	1,648	3,107
Carroll County	R	−37.1%	2,398	5,237	7,658
Cass County	R	−7.8%	2,937	3,435	6,399
Champaign County	R	−17.9%	27,266	39,224	66,925
Christian County	R	−6.1%	7,541	8,534	16,152
Clark County	R	−27.3%	3,032	5,318	8,382
Clay County	R	−28.7%	2,524	4,562	7,104
Clinton County	R	−33.1%	4,628	9,233	13,899
Coles County	R	−32.3%	7,156	14,044	21,295
Cook County	D	+2.6%	1,112,641	1,055,558	2,180,735
Crawford County	R	−33.2%	3,130	6,261	9,424
Cumberland County	R	−26.6%	1,733	3,002	4,762
De Witt County	R	−31.6%	2,352	4,534	6,915
DeKalb County	R	−29.7%	10,942	20,294	31,465
Douglas County	R	−32.6%	2,886	5,691	8,604
DuPage County	R	−51.9%	71,430	227,141	300,215
Edgar County	R	−35.4%	3,241	6,821	10,099
Edwards County	R	−44.8%	1,057	2,778	3,845
Effingham County	R	−42.8%	3,841	9,617	13,504
Fayette County	R	−26.4%	3,844	6,607	10,473
Ford County	R	−46.6%	1,763	4,871	6,663
Franklin County	D	+5.0%	10,667	9,656	20,377
Fulton County	R	−0.1%	9,131	9,147	18,377
Gallatin County	D	+5.5%	2,164	1,939	4,112
Greene County	R	−22.4%	2,563	4,057	6,655
Grundy County	R	−34.4%	4,671	9,595	14,325
Hamilton County	R	−15.4%	2,251	3,074	5,346
Hancock County	R	−25.4%	3,713	6,251	10,001
Hardin County	R	−16.7%	1,205	1,689	2,899
Henderson County	R	−7.5%	1,969	2,289	4,278
Henry County	R	−15.1%	10,679	14,504	25,262
Iroquois County	R	−54.7%	3,300	11,327	14,685
Jackson County	R	−5.8%	12,105	13,609	25,896
Jasper County	R	−35.3%	1,750	3,673	5,454
Jefferson County	R	−14.5%	7,200	9,642	16,885
Jersey County	R	−15.5%	3,762	5,146	8,934
Jo Daviess County	R	−27.2%	3,348	5,877	9,302
Johnson County	R	−35.0%	1,647	3,424	5,083
Kane County	R	−38.8%	31,875	72,655	105,159
Kankakee County	R	−21.6%	15,246	23,807	39,665
Kendall County	R	−48.1%	3,789	10,872	14,730
Knox County	R	−10.9%	12,027	14,974	27,122
Lake County	R	−37.2%	53,947	118,401	173,224
LaSalle County	R	−14.2%	20,532	27,388	48,139
Lawrence County	R	−23.1%	2,924	4,686	7,638
Lee County	R	−47.9%	3,919	11,178	15,155
Livingston County	R	−45.7%	4,567	12,291	16,919
Logan County	R	−41.9%	4,052	9,932	14,046
Macon County	R	−8.9%	25,463	30,457	56,112
Macoupin County	R	−7.3%	10,602	12,282	22,953
Madison County	R	−8.2%	48,352	57,021	105,713
Marion County	R	−19.5%	7,599	11,300	18,945
Marshall County	R	−25.8%	2,386	4,060	6,493
Mason County	R	−10.1%	3,354	4,109	7,486
Massac County	R	−9.0%	3,194	3,827	7,049
McDonough County	R	−34.4%	4,561	9,383	14,001
McHenry County	R	−53.0%	14,420	47,282	62,042
McLean County	R	−33.8%	15,880	32,221	48,349
Menard County	R	−36.4%	1,826	3,925	5,766
Mercer County	R	−10.4%	3,982	4,907	8,927
Monroe County	R	−36.0%	3,256	6,936	10,217
Montgomery County	R	−12.5%	6,360	8,191	14,605
Morgan County	R	−33.1%	5,361	10,683	16,097
Moultrie County	R	−18.7%	2,458	3,593	6,072
Ogle County	R	−47.3%	4,803	13,503	18,396
Peoria County	R	−10.6%	36,830	45,607	82,899
Perry County	R	−12.1%	4,584	5,852	10,472
Piatt County	R	−27.4%	2,840	5,000	7,879
Pike County	R	−14.3%	3,965	5,295	9,285
Pope County	R	−24.3%	940	1,545	2,492
Pulaski County	R	−5.4%	1,724	1,923	3,664
Putnam County	R	−12.5%	1,487	1,912	3,413
Randolph County	R	−19.3%	6,355	9,415	15,829
Richland County	R	−44.2%	2,182	5,665	7,874
Rock Island County	D	+6.7%	40,208	35,121	75,672
Saline County	R	−8.6%	6,038	7,176	13,251
Sangamon County	R	−22.6%	34,059	54,086	88,523
Schuyler County	R	−24.2%	1,533	2,515	4,061
Scott County	R	−35.2%	943	1,976	2,935
Shelby County	R	−19.2%	4,317	6,372	10,730
St. Clair County	D	+1.2%	52,294	51,046	104,148
Stark County	R	−34.8%	1,072	2,228	3,318
Stephenson County	R	−35.6%	6,723	14,237	21,131
Tazewell County	R	−18.7%	23,095	33,782	57,115
Union County	R	−10.6%	3,815	4,721	8,564
Vermilion County	R	−16.2%	16,530	22,932	39,611
Wabash County	R	−33.8%	1,795	3,639	5,453
Warren County	R	−27.5%	3,318	5,846	9,193
Washington County	R	−36.8%	2,363	5,129	7,516
Wayne County	R	−41.1%	2,621	6,298	8,951
White County	R	−22.7%	3,457	5,500	8,983
Whiteside County	R	−19.6%	11,226	16,743	28,096
Will County	R	−26.9%	45,193	78,684	124,397
Williamson County	R	−12.5%	11,614	14,930	26,630
Winnebago County	R	−17.9%	44,629	64,203	109,451
Woodford County	R	−41.5%	4,425	10,758	15,272