St. Clair County, Illinois
AkashicSt. Clair County, ILHarrisD+7.8
2024 precinct map of St. Clair CountyPrecinct-level 2024 presidential results for St. Clair County, with each precinct boundary colored by Democratic-vs-Republican margin, and gold where an independent or third-party candidate carried the precinct.
How it voted
Share of the 2024 vote
| Kamala Harris ✓Democratic | 52.9% | 63,433 |
|---|---|---|
| Donald TrumpRepublican | 45.0% | 54,021 |
| Robert F Kennedy Jr.Independent | 1.8% | 2,201 |
Harris +50Trump +50
162 precincts · 119,962 votes. Hover any precinct for its result.
The precinct map shows the 2024 presidential vote; the timeline scrubs the county’s overall result across 1892–2024.
38 presidential elections
| Year | Won | Democratic | Republican | Other | Margin | Total |
|---|---|---|---|---|---|---|
| D | 52.9%Harris63,433 | 45.0%Trump54,021 | 1.8%Kennedy2,201 | 119,962 | ||
| D | 52.8%Biden68,325 | 44.2%Trump57,150 | 1.2%Jorgensen1,615 | 129,405 | ||
| D | 50.0%Clinton60,756 | 44.4%Trump53,857 | 3.4%Johnson4,181 | 121,436 | ||
| D | 56.2%Obama67,285 | 41.8%Romney50,125 | 1.2%JOHNSON1,383 | 119,827 | ||
| D | 60.6%Obama76,160 | 38.1%McCain47,958 | 1.3%Nader1,626 | 125,744 | ||
| D | 55.1%Kerry62,410 | 44.4%Bush50,203 | 0.5%Badnarik576 | 113,189 | ||
| D | 55.7%Gore55,961 | 42.1%Bush42,299 | 1.6%Nader1,569 | 100,393 | ||
| D | 56.6%Clinton53,405 | 35.0%Dole33,066 | 7.4%Perot7,027 | 94,429 | ||
| D | 53.6%Clinton57,625 | 29.7%Bush31,951 | 16.4%Perot17,592 | 107,541 | ||
| D | 57.0%Dukakis55,465 | 42.6%Bush41,439 | 0.4%Paul409 | 97,313 | ||
| D | 50.2%Mondale52,294 | 49.0%Reagan51,046 | 0.8%Bergland808 | 104,148 | ||
| D | 49.7%Carter50,046 | 45.8%Reagan46,063 | 4.5%Anderson4,564 | 100,673 | ||
| D | 58.6%Carter59,177 | 39.9%Ford40,333 | 1.5%McCarthy1,555 | 101,065 | ||
| R | 47.5%McGovern46,636 | 51.5%Nixon50,519 | 1.0%Schmitz942 | 98,097 | ||
| D | 50.3%Humphrey50,726 | 34.1%Nixon34,442 | 15.6%Wallace15,706 | 100,874 | ||
| D | 72.4%Johnson74,005 | 27.6%Goldwater28,226 | 0.0% | 102,231 | ||
| D | 61.4%Kennedy67,367 | 38.3%Nixon42,046 | 0.3%Byrd338 | 109,751 | ||
| D | 56.9%Stevenson55,295 | 42.8%Eisenhower41,528 | 0.3%Andrews283 | 97,106 | ||
| D | 60.0%Stevenson60,311 | 39.5%Eisenhower39,713 | 0.5%Hallinan479 | 100,503 | ||
| D | 63.4%Truman54,260 | 36.1%Dewey30,883 | 0.6%Thurmond474 | 85,617 | ||
| D | 58.8%Roosevelt48,325 | 40.8%Dewey33,557 | 0.4%Thomas327 | 82,209 | ||
| D | 59.5%Roosevelt53,482 | 40.0%Willkie35,998 | 0.5%Thomas411 | 89,891 | ||
| D | 64.8%Roosevelt54,238 | 31.9%Landon26,684 | 3.4%Lemke2,840 | 83,762 | ||
| D | 65.2%Roosevelt47,305 | 31.3%Hoover22,744 | 3.5%Thomas2,522 | 72,571 | ||
| D | 53.5%Smith36,374 | 45.6%Hoover31,026 | 0.9%Thomas637 | 68,037 | ||
| R | 29.3%Davis14,921 | 45.8%Coolidge23,380 | 24.9%La Follette12,693 | 50,994 | ||
| R | 33.2%Cox14,032 | 51.3%Harding21,681 | 15.4%Debs6,518 | 42,231 | ||
| D | 48.8%Wilson22,622 | 47.8%Hughes22,134 | 3.4%Benson1,575 | 46,331 | ||
| D | 41.9%Wilson10,826 | 31.5%Taft8,156 | 26.6%Roosevelt6,884 | 25,866 | ||
| R | 43.7%Bryan11,342 | 48.7%Taft12,619 | 7.6%Debs1,973 | 25,934 | ||
| R | 38.0%Parker8,200 | 55.3%Roosevelt11,926 | 6.7%Debs1,435 | 21,561 | ||
| D | 49.0%Bryan9,827 | 48.7%McKinley9,764 | 2.4%Woolley472 | 20,063 | ||
| R | 47.5%Bryan8,345 | 51.0%McKinley8,960 | 1.6%Palmer278 | 17,583 | ||
| D | 51.4%Cleveland7,207 | 44.7%Harrison6,276 | 3.9%Weaver551 | 14,034 | ||
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presidential history
Presidential margin, 1892–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1892 | +6.6% |
| 1896 | −3.5% |
| 1900 | +0.3% |
| 1904 | −17.3% |
| 1908 | −4.9% |
| 1912 | +10.3% |
| 1916 | +1.1% |
| 1920 | −18.1% |
| 1924 | −16.6% |
| 1928 | +7.9% |
| 1932 | +33.8% |
| 1936 | +32.9% |
| 1940 | +19.5% |
| 1944 | +18.0% |
| 1948 | +27.3% |
| 1952 | +20.5% |
| 1956 | +14.2% |
| 1960 | +23.1% |
| 1964 | +44.8% |
| 1968 | +16.1% |
| 1972 | −4.0% |
| 1976 | +18.6% |
| 1980 | +4.0% |
| 1984 | +1.2% |
| 1988 | +14.4% |
| 1992 | +23.9% |
| 1996 | +21.5% |
| 2000 | +13.6% |
| 2004 | +10.8% |
| 2008 | +22.4% |
| 2012 | +14.3% |
| 2016 | +5.7% |
| 2020 | +8.6% |
| 2024 | +7.8% |
DemocraticRepublican
voter registration
Registered voters
Total registered voters, over time
Registered voters
| Year | Total registered |
|---|---|
| 2016 | 182,814 |
| 2018 | 180,207 |
| 2020 | 4,030 |
| 2022 | 183,411 |
| 2024 | 188,339 |
Source: U.S. Election Assistance Commission (EAVS)
St. Clair County anchors Illinois's Metro East region across the Mississippi from St. Louis, with a diverse population and urban-suburban mix that has returned Democratic presidential margins in the single to low double digits for over two decades.
Across the recorded series it reached a Democratic high of 44.8 points in 1964 and a Republican high of 18.1 points in 1920. Between 2020 and 2024 the county moved 0.8 points toward the Republican candidate; the 2024 margin was 7.8 points.
A population of 253,694, a 59% non-Hispanic-white share, and a median household income of $73,854 describe the county. The county's voting pattern over the last decade is most similar to that of Marquette County and Rock Island County.
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Compare two places, side by side
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All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
St. Clair County, Illinois. Akashic. https://akashic.app/county/17163/. Accessed May 20, 2026. License: CC BY 4.0.
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Cities & towns in St. Clair County
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Frequently asked questions
How did St. Clair County, Illinois vote in 2024?
In 2024, St. Clair County, Illinois voted Democratic by 7.8 points (D+7.8), carried by the Democratic candidate. Out of 119,962 votes cast, 63,433 went Democratic and 54,021 went Republican.
When did St. Clair County, Illinois last vote Republican?
The most recent presidential election in which St. Clair County, Illinois voted Republican was 1972.
How many people live in St. Clair County, Illinois?
St. Clair County, Illinois has a population of 253,694 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in St. Clair County, Illinois?
Median household income in St. Clair County, Illinois is $73,854 — below the national median of $80,734. The Illinois state median is $83,390.
What is the political history of St. Clair County, Illinois?
Akashic tracks 38 presidential elections in St. Clair County, Illinois from 1876 to 2024. Of those, 28 went Democratic and 6 went Republican.