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Williamson County, IL


Metropolitan Statistical Area: Carbondale-Marion, IL
Designated Market Area: Paducah-Cape Girardeau-Harrisburg, KY-MO-IL-TN
USDA County Type (2025): Government
American Communities Project County Type (2023): Rural Middle America

Places in Williamson County, IL     [Sort places by name]

 

Tracts in Williamson County, IL

   



Click here to view demographic data for Williamson County, IL

2024 population: 67,064   ( 90 from 2020)
Land area: 420.2 square miles
Population density: 159.6 persons per square mile

2024 Census data
White:58,804 87.68% 1.8%
Black:3,4205.10% 8.6%
Indian:2340.35% 6.8%
Asian:1,1111.66% 24.1%
2+ races:1,4082.10% 15.3%
Hispanic:2,0873.11% 15.6%
Total non-White:8,26012.32% 13.3%

2020-2024 ComponentsNumberRate
Births:2,645 9.8
Deaths:3,70313.8
Net Migration: 5652.1
Net Immigration: 3631.4
Change in White population:-1,062 -1.6
Change in Non-White pop.:972 1.4



Historical Presidential Election Results for Williamson County, IL

Recent Trends
VotesΔ MarginSwing %
2024 vs. 2020 R -115 R +201 R + 1.1%
D -316
2024 vs. 2016 R +1,116 D +193 D + 3.8%
D +1,309
2020 vs. 2016 R +1,231 D +394 D + 4.9%
D +1,625
2024 vs. 2012 R +4,777 R +5,534 R + 13.8%
D -757
2016 vs. 2008 R +4,531 R +8,539 R + 28.1%
D -4,008
How to interpret this table


Click on the Year to view county-level data for that election.

YearTurnout WinnerRunner-Up OtherTotal Votes Diff
(St) 		Diff
(US) 		PSV
2024 63% Donald Trump (R) 22,686 68.4% Kamala Harris (D) 9,890 29.8% 598 [+] 1.8% 33,174 25 19 0.59%
2020 64% Donald Trump* (R) 22,801 67.6% Joe Biden (D) 10,206 30.3% 723 [+] 2.1% 33,730 27 21 0.56%
2016 61% Donald Trump (R) 21,570 67.7% Hillary Clinton (D) 8,581 26.9% 1,701 [+] 5.3% 31,852 29 22 0.57%
2012 56% Mitt Romney (R) 17,909 61.2% Barack Obama* (D) 10,647 36.4% 698 [+] 2.4% 29,254 21 14 0.56%
2008 60% John McCain (R) 17,039 56.3% Barack Obama (D) 12,589 41.6% 638 [+] 2.1% 30,266 20 11 0.55%
2004 61% George W. Bush* (R) 18,086 60.4% John Kerry (D) 11,685 39.0% 189 [+] 0.6% 29,960 16 10 0.57%
2000 57% George W. Bush (R) 14,012 52.0% Albert Gore, Jr. (D) 12,192 45.3% 735 [+] 2.7% 26,939 9 4 0.57%
1996 55% Bill Clinton* (D) 12,510 49.5% Robert Dole (R) 9,734 38.5% 3,028 [+] 12.0% 25,272 2 -2 0.59%
1992 65% Bill Clinton (D) 14,361 49.9% George Bush* (R) 9,462 32.9% 4,937 [+] 17.2% 28,760 -1 -5 0.57%
1988 58% Michael Dukakis (D) 12,712 50.6% George Bush (R) 12,274 48.8% 144 [+] 0.6% 25,130 -2 -5 0.55%
1984 62% Ronald Reagan* (R) 14,930 56.1% Walter Mondale (D) 11,614 43.6% 86 0.3% 26,630 0 -3 0.55%
1980 63% Ronald Reagan (R) 14,451 55.1% Jimmy Carter* (D) 10,779 41.1% 998 [+] 3.8% 26,228 5 4 0.55%
1976 66% Jimmy Carter (D) 13,600 55.4% Gerald Ford* (R) 10,703 43.6% 250 [+] 1.0% 24,553 -7 -4 0.52%
1972 66% Richard Nixon* (R) 14,101 60.4% George McGovern (D) 9,202 39.4% 26 [+] 0.1% 23,329 1 0 0.49%
1968 76% Richard Nixon (R) 11,886 50.4% Hubert Humphrey (D) 9,660 41.0% 2,042 [+] 8.7% 23,588 3 7 0.51%
1964 78% Lyndon Johnson* (D) 14,613 61.5% Barry Goldwater (R) 9,130 38.5% 0 0.0% 23,743 -2 0 0.50%
1960 85% Richard Nixon (R) 13,732 54.7% John Kennedy (D) 11,335 45.2% 29 0.1% 25,096 5 5 0.53%
1956 72% Dwight Eisenhower* (R) 13,438 56.4% Adlai Stevenson (D) 10,345 43.4% 27 0.1% 23,810 -3 -1 0.54%
1952 72% Dwight Eisenhower (R) 13,348 55.1% Adlai Stevenson (D) 10,838 44.7% 37 0.2% 24,223 0 0 0.54%
1948 59% Thomas Dewey (R) 10,386 51.0% Harry Truman* (D) 9,841 48.3% 130 [+] 0.6% 20,357 2 6 0.51%
1944 64% Thomas Dewey (R) 12,594 55.6% Franklin Roosevelt* (D) 9,974 44.0% 103 0.5% 22,671 8 10 0.56%
1940 81% Franklin Roosevelt* (D) 14,645 50.1% Wendell Willkie (R) 14,433 49.4% 139 0.5% 29,217 1 5 0.69%
1936 80% Franklin Roosevelt* (D) 14,663 53.6% Alf Landon (R) 12,319 45.1% 352 [+] 1.3% 27,334 5 9 0.69%
1932 64% Franklin Roosevelt (D) 12,961 58.2% Herbert Hoover* (R) 8,714 39.1% 590 [+] 2.6% 22,265 -3 0 0.65%
1928 62% Herbert Hoover (R) 10,913 51.2% Al Smith (D) 10,139 47.6% 257 [+] 1.2% 21,309 -6 -7 0.69%
1924 57% Calvin Coolidge (R) 9,366 45.3% John Davis (D) 6,117 29.6% 5,206 [+] 25.2% 20,689 -14 -9 0.84%
1920 47% Warren Harding (R) 10,118 56.7% James Cox (D) 4,728 26.5% 2,988 [+] 16.8% 17,834 -11 -4 0.85%
1916 57% Charles Evans Hughes (R) 10,262 53.5% Woodrow Wilson* (D) 8,172 42.6% 746 [+] 3.9% 19,180 1 7 0.87%
1912 31% Woodrow Wilson (D) 3,258 35.2% William Taft* (R) 3,209 34.6% 2,800 [+] 30.2% 9,267 13 11 0.81%
1908 37% William Taft (R) 4,786 52.6% William J. Bryan (D) 3,513 38.6% 794 [+] 8.7% 9,093 -2 1 0.79%
1904 34% Theodore Roosevelt (R) 4,044 59.0% Alton Parker (D) 1,996 29.1% 819 [+] 11.9% 6,859 0 3 0.64%
1900 40% William McKinley* (R) 3,723 56.9% William J. Bryan (D) 2,760 42.2% 57 [+] 0.9% 6,540 4 5 0.58%
* incumbent         PSV: percent of state vote

Historical Statewide Election Results for Williamson County, IL

Click on the Year to view county-level data for that election.

YearTypeTurnout WinnerRunner-Up OtherTotal VotesDiff PSV
2022 S3 48% Kathy Salvi (R) 16,665 66.4% Tammy Duckworth* (D) 8,067 32.1% 380 [+] 1.5% 25,112 25 0.61%
2022 G 48% Darren Bailey (R) 17,723 70.5% J.B. Pritzker* (D) 6,821 27.1% 589 [+] 2.3% 25,133 28 0.61%
2020 S2 63% Mark Curran (R) 20,679 62.4% Richard Durbin* (D) 11,473 34.6% 964 [+] 2.9% 33,116 24 0.55%
2018 G 52% Bruce Rauner* (R) 14,471 53.7% J.B. Pritzker (D) 9,440 35.0% 3,023 [+] 11.2% 26,934 15 0.59%
2016 S3 60% Mark Kirk* (R) 16,075 51.6% Tammy Duckworth (D) 13,518 43.4% 1,543 [+] 5.0% 31,136 12 0.57%
2014 S2 39% Jim Oberweis (R) 11,880 58.5% Richard Durbin* (D) 7,686 37.8% 754 [+] 3.7% 20,320 16 0.56%
2014 G 39% Bruce Rauner (R) 13,081 64.2% Pat Quinn* (D) 6,177 30.3% 1,129 [+] 5.5% 20,387 14 0.56%
2010 S3 43% Mark Kirk (R) 13,197 59.8% Alexi Giannoulias (D) 7,320 33.2% 1,560 [+] 7.1% 22,077 12 0.60%
2010 G 43% Bill Brady (R) 12,240 54.6% Pat Quinn* (D) 8,654 38.6% 1,527 [+] 6.8% 22,421 9 0.60%
2008 S2 57% Richard Durbin* (D) 16,002 55.1% Steve Sauerberg (R) 11,564 39.8% 1,454 [+] 5.0% 29,020 11 0.54%
2006 G 41% Rod Blagojevich* (D) 8,493 41.6% Judy Baar Topinka (R) 8,198 40.2% 3,721 [+] 18.2% 20,412 1 0.59%
2004 S3 59% Barack Obama (D) 17,113 58.9% Alan Keyes (R) 10,902 37.6% 1,018 [+] 3.5% 29,033 11 0.56%
2002 S2 43% Richard Durbin* (D) 11,498 55.6% Jim Durkin (R) 8,856 42.8% 327 [+] 1.6% 20,681 5 0.59%
2002 G 44% Jim Ryan (R) 11,054 52.1% Rod Blagojevich (D) 9,627 45.4% 516 [+] 2.4% 21,197 7 0.60%
1998 S3 49% Peter Fitzgerald (R) 13,317 58.7% Carol Moseley-Braun* (D) 8,792 38.7% 588 [+] 2.6% 22,697 8 0.67%
1998 G 51% Glenn Poshard (D) 19,510 82.2% George Ryan (R) 4,110 17.3% 129 [+] 0.5% 23,749 -34 0.71%
1996 S2 54% Richard Durbin (D) 13,096 52.9% Al Salvi (R) 10,973 44.3% 707 [+] 2.9% 24,776 4 0.58%
1994 G 44% Jim Edgar* (R) 13,737 69.4% Dawn Clark Netsch (D) 5,603 28.3% 443 [+] 2.2% 19,783 6 0.64%
1992 S3 63% Carol Moseley-Braun (D) 14,037 50.1% Richard Williamson (R) 12,587 44.9% 1,418 [+] 5.1% 28,042 2 0.57%
1990 S2 49% Paul Simon* (D) 16,000 74.8% Lynn Martin (R) 5,394 25.2% 0 0.0% 21,394 -10 0.66%
1990 G 49% Neil Hartigan (D) 11,937 55.7% Jim Edgar (R) 9,304 43.4% 196 [+] 0.9% 21,437 -7 0.66%
1986 S3 48% Alan Dixon* (D) 14,210 68.3% Judy Koehler (R) 6,418 30.9% 169 [+] 0.8% 20,797 -3 0.67%
1986 G 49% James Thompson* (R) 10,467 49.8% Adlai Stevenson III (Illinois Solidarity) 8,941 42.6% 1,598 [+] 7.6% 21,006 -3 0.67%
1984 S2 62% Paul Simon (D) 15,501 58.3% Charles Percy* (R) 10,954 41.2% 151 [+] 0.6% 26,606 -7 0.56%
1982 G 50% Adlai Stevenson III (D) 11,060 52.5% James Thompson* (R) 9,851 46.7% 175 [+] 0.8% 21,086 -3 0.57%
1980 S3 57% Alan Dixon (D) 12,690 53.1% David O'Neal (R) 10,987 46.0% 209 [+] 0.9% 23,886 4 0.52%
1978 S2 43% Alex Seith (D) 8,389 50.5% Charles Percy* (R) 8,096 48.7% 127 [+] 0.8% 16,612 -5 0.52%
1978 G 44% James Thompson* (R) 8,512 50.3% Michael Bakalis (D) 8,310 49.1% 94 [+] 0.6% 16,916 -9 0.54%
1976 G 65% James Thompson (R) 14,936 61.9% Michael Howlitt (D) 9,114 37.8% 69 [+] 0.3% 24,119 -3 0.52%
1974 S3 49% Adlai Stevenson III* (D) 10,630 60.4% George Burditt (R) 6,932 39.4% 48 [+] 0.3% 17,610 2 0.60%
1972 S2 64% Charles Percy* (R) 13,614 60.9% Roman Pucinski (D) 8,661 38.7% 85 [+] 0.4% 22,360 -1 0.49%
1972 G 66% Daniel Walker (D) 12,766 54.7% Richard Ogilvie* (R) 10,562 45.2% 17 [+] 0.1% 23,345 -4 0.50%
1970 S3 61% Adlai Stevenson III (D) 9,691 50.4% Ralph Smith* (R) 9,529 49.5% 22 [+] 0.1% 19,242 7 0.53%
1968 S3 72% Everett Dirksen* (R) 13,119 58.5% William Clark (D) 9,282 41.4% 12 [+] 0.1% 22,413 6 0.50%
1968 G 73% Richard Ogilvie (R) 11,947 52.4% Samuel Shapiro* (D) 10,854 47.6% 16 [+] 0.1% 22,817 1 0.51%
1966 S2 68% Charles Percy (R) 11,190 53.7% Paul Douglas* (D) 9,658 46.3% 0 0.0% 20,848 -1 0.55%
1964 G 78% Otto Kerner* (D) 12,514 52.9% Charles Percy (R) 11,126 47.1% 0 0.0% 23,640 -1 0.51%
1962 S3 70% Sidney Yates (D) 10,875 52.2% Everett Dirksen* (R) 9,954 47.8% 0 0.0% 20,829 -5 0.56%
1960 S2 83% Paul Douglas* (D) 13,350 54.5% Samuel Witwer (R) 11,125 45.4% 14 [+] 0.1% 24,489 0 0.53%
1960 G 84% William Stratton* (R) 12,540 50.3% Otto Kerner (D) 12,351 49.6% 25 [+] 0.1% 24,916 6 0.53%
*: incumbent               +: ran on additional party lines               Type: G: Governor; S1,S2,S3: Senate Class 1, 2 or 3
italics: special election           RO: runoff election           PSV: percent of state vote


Historical U.S. House Election Results for Williamson County, IL

Click on the District to view county-level data for that election (where available).

DateDistrictWinnerRunner-Up OtherTotal Votes
2024-11-05 IL12Mike Bost* (R) 23,539 71.9% Brian Roberts (D) 9,202 28.1% 0 0.0% 32,741
County Total for 2024-11-05:   32,741
2022-11-08 IL12Mike Bost* (R) 18,274 72.8% Chip Markel (D) 6,812 27.2% 0 0.0% 25,086
County Total for 2022-11-08:   25,086
2020-11-03 IL12Mike Bost* (R) 23,965 72.4% Raymond Lenzi (D) 9,121 27.6% 0 0.0% 33,086
County Total for 2020-11-03:   33,086
2018-11-06 IL12Mike Bost* (R) 17,728 64.6% Brendan Kelly (D) 8,996 32.8% 705 2.6% 27,429
County Total for 2018-11-06:   27,429
2016-11-08 IL12Mike Bost* (R) 21,497 68.9% C.J. Baricevic (D) 8,061 25.8% 1,632 5.2% 31,190
County Total for 2016-11-08:   31,190
2014-11-04 IL12Mike Bost (R) 13,938 67.4% William Enyart* (D) 5,668 27.4% 1,065 5.2% 20,671
County Total for 2014-11-04:   20,671
2012-11-06 IL12Jason Plummer (R) 14,981 52.3% William Enyart (D) 11,632 40.6% 2,048 7.1% 28,661
County Total for 2012-11-06:   28,661
2010-11-02 IL12Jerry Costello* (D) 10,229 49.6% Teri Davis-Newman (R) 9,506 46.1% 891 4.3% 20,626
2010-11-02 IL19John Shimkus* (R) 972 71.0% Tim Bagwell (D) 397 29.0% 0 0.0% 1,369
County Total for 2010-11-02:   21,995
2008-11-04 IL12Jerry Costello* (D) 16,492 61.4% Timmy Richardson (R) 9,164 34.1% 1,196 4.5% 26,852
2008-11-04 IL19John Shimkus* (R) 1,152 68.2% Daniel Davis (D) 492 29.1% 46 2.7% 1,690
County Total for 2008-11-04:   28,542
2006-11-07 IL12Jerry Costello* (D) 14,523 100.0% 0 0.0% 14,523
2006-11-07 IL19John Shimkus* (R) 794 60.7% Danny Stover (D) 514 39.3% 0 0.0% 1,308
County Total for 2006-11-07:   15,831
2004-11-02 IL12Jerry Costello* (D) 16,191 59.8% Erin Zweigert (R) 10,470 38.7% 411 1.5% 27,072
2004-11-02 IL19John Shimkus* (R) 1,090 65.4% Tim Bagwell (D) 577 34.6% 0 0.0% 1,667
County Total for 2004-11-02:   28,739
2002-11-05 IL12Jerry Costello* (D) 11,757 60.3% David Sadler (R) 7,746 39.7% 0 0.0% 19,503
2002-11-05 IL19David Phelps* (D) 758 58.0% John Shimkus* (R) 549 42.0% 0 0.0% 1,307
County Total for 2002-11-05:   20,810
2000-11-07 IL12Jerry Costello* (D) 3,725 100.0% 0 0.0% 3,725
2000-11-07 IL19David Phelps* (D) 14,653 68.8% Jim Eatherly (R) 6,638 31.2% 0 0.0% 21,291
County Total for 2000-11-07:   25,016
1998-11-03 IL12Jerry Costello* (D) 2,807 68.1% William Price (R) 1,313 31.9% 0 0.0% 4,120
1998-11-03 IL19David Phelps (D) 12,461 64.9% Brent Winters (R) 6,733 35.1% 0 0.0% 19,194
County Total for 1998-11-03:   23,314
1996-11-05 IL12Jerry Costello* (D) 2,810 65.7% Shapley Hunter (R) 1,373 32.1% 95 2.2% 4,278
1996-11-05 IL19Glenn Poshard* (D) 15,556 75.5% Brent Winters (R) 4,885 23.7% 173 0.8% 20,614
County Total for 1996-11-05:   24,892
1994-11-08 IL12Jerry Costello* (D) 1,848 54.5% Jan Morris (R) 1,543 45.5% 0 0.0% 3,391
1994-11-08 IL19Glenn Poshard* (D) 10,855 64.7% Brent Winters (R) 5,934 35.3% 0 0.0% 16,789
County Total for 1994-11-08:   20,180
1992-11-03 IL12Jerry Costello* (D) 3,156 64.9% Mike Starr (R) 1,706 35.1% 0 0.0% 4,862
County Total for 1992-11-03:   4,862
*: incumbent           sp: special election           RO: runoff election

Voter Registration Data for Williamson County, IL

Party registration is not used in this state, however as of 2022 registrations in Williamson County, IL were estimated to be 33% Republican and 24% Democrat.

YearTotalRepublicanDemocratOtherR/D EdgeR/D Edge %VAPOP %
2024 47,696 0 0.0% 0 0.0% 47,696 100.0% n/a n/a 91%
2022 45,841 0 0.0% 0 0.0% 45,841 100.0% n/a n/a 88%
2020 47,393 0 0.0% 0 0.0% 47,393 100.0% n/a n/a 91%
2018 45,877 0 0.0% 0 0.0% 45,877 100.0% n/a n/a 88%
2016 45,844 0 0.0% 0 0.0% 45,844 100.0% n/a n/a 88%
2012 43,614 0 0.0% 0 0.0% 43,614 100.0% n/a n/a 84%
2010 43,569 0 0.0% 0 0.0% 43,569 100.0% n/a n/a 84%
2008 43,676 0 0.0% 0 0.0% 43,676 100.0% n/a n/a 86%
2006 42,900 0 0.0% 0 0.0% 42,900 100.0% n/a n/a 86%
2004 44,417 0 0.0% 0 0.0% 44,417 100.0% n/a n/a 91%
2000 40,266 0 0.0% 0 0.0% 40,266 100.0% n/a n/a 85%
1994 37,523 0 0.0% 0 0.0% 37,523 100.0% n/a n/a 83%
1986 37,285 0 0.0% 0 0.0% 37,285 100.0% n/a n/a 87%
VAPOP% is the estimated percentage of voting age population that is registered.
Registration data may include "inactive" voters.   Data for each year pertains to the November elections.