Mercer County, Illinois
AkashicMercer County, ILTrumpR+27.1
2024 precinct map of Mercer CountyPrecinct-level 2024 presidential results for Mercer 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
| Donald Trump ✓Republican | 62.5% | 5,215 |
|---|---|---|
| Kamala HarrisDemocratic | 35.3% | 2,950 |
| Robert F Kennedy Jr.Independent | 2.2% | 180 |
Harris +50Trump +50
24 precincts · 8,346 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 |
|---|---|---|---|---|---|---|
| R | 35.3%Harris2,950 | 62.5%Trump5,215 | 2.2%Kennedy180 | 8,346 | ||
| R | 36.8%Biden3,280 | 60.8%Trump5,418 | 1.5%Jorgensen134 | 8,914 | ||
| R | 36.0%Clinton3,071 | 56.4%Trump4,807 | 5.6%Johnson475 | 8,525 | ||
| D | 52.6%Obama4,507 | 45.2%Romney3,876 | 1.3%JOHNSON108 | 8,568 | ||
| D | 55.2%Obama4,887 | 43.3%McCain3,833 | 1.4%Nader128 | 8,848 | ||
| D | 50.3%Kerry4,512 | 49.1%Bush4,405 | 0.6%Badnarik57 | 8,974 | ||
| D | 52.9%Gore4,400 | 44.3%Bush3,688 | 1.9%Nader156 | 8,318 | ||
| D | 54.2%Clinton4,278 | 34.0%Dole2,688 | 11.3%Perot889 | 7,897 | ||
| D | 46.7%Clinton3,990 | 34.9%Bush2,983 | 18.0%Perot1,535 | 8,540 | ||
| D | 53.0%Dukakis4,204 | 46.4%Bush3,683 | 0.5%Paul42 | 7,929 | ||
| R | 44.6%Mondale3,982 | 55.0%Reagan4,907 | 0.4%Bergland38 | 8,927 | ||
| R | 36.7%Carter3,361 | 56.2%Reagan5,144 | 7.1%Anderson651 | 9,156 | ||
| R | 45.5%Carter4,090 | 53.6%Ford4,816 | 0.8%McCarthy76 | 8,982 | ||
| R | 38.9%McGovern3,477 | 61.0%Nixon5,452 | 0.1%Schmitz11 | 8,940 | ||
| R | 36.5%Humphrey3,143 | 56.3%Nixon4,844 | 7.1%Wallace613 | 8,600 | ||
| D | 51.1%Johnson4,410 | 48.9%Goldwater4,220 | 0.0% | 8,630 | ||
| R | 38.4%Kennedy3,476 | 61.6%Nixon5,582 | 0.0%Byrd3 | 9,061 | ||
| R | 34.1%Stevenson2,969 | 65.8%Eisenhower5,732 | 0.1%Andrews7 | 8,708 | ||
| R | 29.4%Stevenson2,679 | 70.5%Eisenhower6,416 | 0.0%Hallinan2 | 9,097 | ||
| R | 37.0%Truman3,117 | 62.6%Dewey5,267 | 0.4%Thurmond36 | 8,420 | ||
| R | 36.5%Roosevelt3,277 | 63.1%Dewey5,667 | 0.4%Thomas34 | 8,978 | ||
| R | 37.5%Roosevelt3,830 | 62.1%Willkie6,336 | 0.4%Thomas38 | 10,204 | ||
| R | 48.1%Roosevelt4,751 | 50.9%Landon5,028 | 1.1%Lemke105 | 9,884 | ||
| R | 48.8%Roosevelt4,309 | 50.2%Hoover4,436 | 1.0%Thomas90 | 8,835 | ||
| R | 28.7%Smith2,316 | 70.6%Hoover5,699 | 0.7%Thomas58 | 8,073 | ||
| R | 20.7%Davis1,699 | 68.3%Coolidge5,618 | 11.0%La Follette908 | 8,225 | ||
| R | 21.2%Cox1,574 | 74.6%Harding5,531 | 4.2%Debs311 | 7,416 | ||
| R | 38.1%Wilson3,430 | 58.9%Hughes5,308 | 3.0%Benson268 | 9,006 | ||
| O | 32.1%Wilson1,602 | 19.2%Taft959 | 48.7%Roosevelt2,435 | 4,996 | ||
| R | 35.6%Bryan1,777 | 57.5%Taft2,871 | 6.9%Debs344 | 4,992 | ||
| R | 27.3%Parker1,386 | 63.6%Roosevelt3,230 | 9.0%Debs459 | 5,075 | ||
| R | 37.9%Bryan2,110 | 59.4%McKinley3,304 | 2.7%Woolley149 | 5,563 | ||
| R | 42.2%Bryan2,329 | 56.5%McKinley3,120 | 1.4%Palmer75 | 5,524 | ||
| R | 42.1%Cleveland1,975 | 52.7%Harrison2,470 | 5.2%Weaver242 | 4,687 | ||
| — | — | — | — | — | ||
| — | — | — | — | — | ||
| — | — | — | — | — | ||
| — | — | — | — | — |
presidential history
Presidential margin, 1892–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1892 | −10.6% |
| 1896 | −14.3% |
| 1900 | −21.5% |
| 1904 | −36.3% |
| 1908 | −21.9% |
| 1912 | +12.9% |
| 1916 | −20.9% |
| 1920 | −53.4% |
| 1924 | −47.6% |
| 1928 | −41.9% |
| 1932 | −1.4% |
| 1936 | −2.8% |
| 1940 | −24.6% |
| 1944 | −26.6% |
| 1948 | −25.5% |
| 1952 | −41.1% |
| 1956 | −31.7% |
| 1960 | −23.2% |
| 1964 | +2.2% |
| 1968 | −19.8% |
| 1972 | −22.1% |
| 1976 | −8.1% |
| 1980 | −19.5% |
| 1984 | −10.4% |
| 1988 | +6.6% |
| 1992 | +11.8% |
| 1996 | +20.1% |
| 2000 | +8.6% |
| 2004 | +1.2% |
| 2008 | +11.9% |
| 2012 | +7.4% |
| 2016 | −20.4% |
| 2020 | −24.0% |
| 2024 | −27.1% |
DemocraticRepublican
voter registration
Registered voters
Total registered voters, over time
Registered voters
| Year | Total registered |
|---|---|
| 2016 | 12,621 |
| 2018 | 12,777 |
| 2020 | 13,069 |
| 2022 | 12,921 |
| 2024 | 13,021 |
Source: U.S. Election Assistance Commission (EAVS)
Mercer County's 2024 presidential margin of R+27.1 reflects a broader rural realignment across western Illinois, where small agricultural communities have moved decisively away from their mid-20th-century Democratic leanings.
Across the recorded series it reached a Democratic high of 20.1 points in 1996 and a Republican high of 53.4 points in 1920. Between 2020 and 2024 the county moved 3.2 points toward the Republican candidate; the 2024 margin was 27.1 points.
A population of 15,495, a 93% non-Hispanic-white share, and a median household income of $74,182 describe the county. The county's voting pattern over the last decade is most similar to that of Adams County and Henderson County.
Most similar counties
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Mercer County, Illinois. Akashic. https://akashic.app/county/17131/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
Embed this page
A live widget for your site — no API key, attribution built in, CC BY 4.0. All widgets & sizes →
Illinois at the ballot boxAll elections →
Frequently asked questions
How did Mercer County, Illinois vote in 2024?
In 2024, Mercer County, Illinois voted Republican by 27.1 points (R+27.1), carried by the Republican candidate. Out of 8,346 votes cast, 2,950 went Democratic and 5,215 went Republican.
When did Mercer County, Illinois last vote Democratic?
The most recent presidential election in which Mercer County, Illinois voted Democratic was 2012.
How many people live in Mercer County, Illinois?
Mercer County, Illinois has a population of 15,495 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Mercer County, Illinois?
Median household income in Mercer County, Illinois is $74,182 — below the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Mercer County, Illinois?
Akashic tracks 38 presidential elections in Mercer County, Illinois from 1876 to 2024. Of those, 8 went Democratic and 25 went Republican.