Rock Island County, Illinois
AkashicRock Island County, ILHarrisD+9.6
2024 precinct map of Rock Island CountyPrecinct-level 2024 presidential results for Rock Island 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 | 53.8% | 34,126 |
|---|---|---|
| Donald TrumpRepublican | 44.2% | 28,061 |
| Robert F Kennedy Jr.Independent | 1.7% | 1,080 |
Harris +50Trump +50
120 precincts · 63,458 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 | 53.8%Harris34,126 | 44.2%Trump28,061 | 1.7%Kennedy1,080 | 63,458 | ||
| D | 54.8%Biden36,691 | 42.7%Trump28,603 | 1.4%Jorgensen959 | 66,947 | ||
| D | 50.5%Clinton32,298 | 42.2%Trump26,998 | 4.7%Johnson3,015 | 63,994 | ||
| D | 60.0%Obama39,157 | 38.2%Romney24,934 | 1.0%JOHNSON651 | 65,217 | ||
| D | 61.7%Obama42,210 | 37.1%McCain25,364 | 1.2%Nader827 | 68,401 | ||
| D | 57.0%Kerry39,880 | 42.4%Bush29,663 | 0.6%Badnarik429 | 69,972 | ||
| D | 58.3%Gore37,957 | 38.7%Bush25,194 | 2.1%Nader1,364 | 65,095 | ||
| D | 57.1%Clinton34,822 | 33.8%Dole20,626 | 8.4%Perot5,135 | 60,955 | ||
| D | 51.9%Clinton37,412 | 32.2%Bush23,212 | 14.5%Perot10,416 | 72,039 | ||
| D | 59.2%Dukakis40,174 | 40.4%Bush27,412 | 0.5%Paul315 | 67,901 | ||
| D | 53.1%Mondale40,208 | 46.4%Reagan35,121 | 0.5%Bergland343 | 75,672 | ||
| R | 41.9%Carter30,045 | 48.5%Reagan34,788 | 9.7%Anderson6,942 | 71,775 | ||
| D | 50.5%Carter35,994 | 47.7%Ford34,007 | 1.8%McCarthy1,260 | 71,261 | ||
| R | 46.3%McGovern32,529 | 53.4%Nixon37,548 | 0.4%Schmitz253 | 70,330 | ||
| D | 49.2%Humphrey34,506 | 43.3%Nixon30,404 | 7.5%Wallace5,230 | 70,140 | ||
| D | 63.8%Johnson41,759 | 36.2%Goldwater23,714 | 0.0% | 65,473 | ||
| D | 50.9%Kennedy33,812 | 49.0%Nixon32,534 | 0.2%Byrd108 | 66,454 | ||
| R | 48.1%Stevenson29,145 | 51.7%Eisenhower31,342 | 0.2%Andrews118 | 60,605 | ||
| R | 45.8%Stevenson27,879 | 54.1%Eisenhower32,933 | 0.2%Hallinan100 | 60,912 | ||
| D | 52.0%Truman24,542 | 47.0%Dewey22,192 | 1.0%Thurmond477 | 47,211 | ||
| D | 55.5%Roosevelt30,102 | 44.2%Dewey23,980 | 0.3%Thomas180 | 54,262 | ||
| D | 57.7%Roosevelt35,240 | 41.9%Willkie25,629 | 0.4%Thomas232 | 61,101 | ||
| D | 61.7%Roosevelt32,741 | 36.7%Landon19,487 | 1.5%Lemke799 | 53,027 | ||
| D | 53.0%Roosevelt24,676 | 45.6%Hoover21,205 | 1.4%Thomas668 | 46,549 | ||
| R | 34.3%Smith14,334 | 65.2%Hoover27,246 | 0.5%Thomas196 | 41,776 | ||
| R | 10.2%Davis3,631 | 57.7%Coolidge20,563 | 32.1%La Follette11,453 | 35,647 | ||
| R | 17.0%Cox5,208 | 71.3%Harding21,908 | 11.7%Debs3,603 | 30,719 | ||
| R | 36.0%Wilson10,914 | 53.3%Hughes16,169 | 10.7%Benson3,239 | 30,322 | ||
| O | 26.1%Wilson3,997 | 15.7%Taft2,394 | 58.2%Roosevelt8,898 | 15,289 | ||
| R | 32.1%Bryan4,739 | 55.4%Taft8,196 | 12.5%Debs1,846 | 14,781 | ||
| R | 16.3%Parker2,156 | 61.7%Roosevelt8,152 | 21.9%Debs2,895 | 13,203 | ||
| R | 35.3%Bryan4,786 | 61.2%McKinley8,299 | 3.5%Woolley471 | 13,556 | ||
| R | 38.5%Bryan4,692 | 60.1%McKinley7,323 | 1.4%Palmer176 | 12,191 | ||
| R | 41.8%Cleveland4,034 | 52.4%Harrison5,052 | 5.8%Weaver559 | 9,645 | ||
| — | — | — | — | — | ||
| — | — | — | — | — | ||
| — | — | — | — | — | ||
| — | — | — | — | — |
presidential history
Presidential margin, 1892–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1892 | −10.6% |
| 1896 | −21.6% |
| 1900 | −25.9% |
| 1904 | −45.4% |
| 1908 | −23.4% |
| 1912 | +10.5% |
| 1916 | −17.3% |
| 1920 | −54.4% |
| 1924 | −47.5% |
| 1928 | −30.9% |
| 1932 | +7.5% |
| 1936 | +25.0% |
| 1940 | +15.7% |
| 1944 | +11.3% |
| 1948 | +5.0% |
| 1952 | −8.3% |
| 1956 | −3.6% |
| 1960 | +1.9% |
| 1964 | +27.6% |
| 1968 | +5.8% |
| 1972 | −7.1% |
| 1976 | +2.8% |
| 1980 | −6.6% |
| 1984 | +6.7% |
| 1988 | +18.8% |
| 1992 | +19.7% |
| 1996 | +23.3% |
| 2000 | +19.6% |
| 2004 | +14.6% |
| 2008 | +24.6% |
| 2012 | +21.8% |
| 2016 | +8.3% |
| 2020 | +12.1% |
| 2024 | +9.6% |
DemocraticRepublican
voter registration
Registered voters
Total registered voters, over time
Registered voters
| Year | Total registered |
|---|---|
| 2016 | 100,163 |
| 2018 | 100,163 |
| 2020 | 91,852 |
| 2022 | 87,406 |
| 2024 | 90,276 |
Source: U.S. Election Assistance Commission (EAVS)
Rock Island anchors Illinois's Quad Cities metro along the Iowa border, where a unionized manufacturing heritage and a diverse urban core in Rock Island and Moline have kept the county reliably left of center in statewide contests.
Across the recorded series it reached a Democratic high of 27.6 points in 1964 and a Republican high of 54.4 points in 1920. Between 2020 and 2024 the county moved 2.5 points toward the Republican candidate; the 2024 margin was 9.6 points.
A population of 142,757, a 67% non-Hispanic-white share, and a median household income of $67,159 describe the county. The county's voting pattern over the last decade is most similar to that of Costilla County and Genesee 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.
Rock Island County, Illinois. Akashic. https://akashic.app/county/17161/. 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 →
Cities & towns in Rock Island County
Illinois at the ballot boxAll elections →
Frequently asked questions
How did Rock Island County, Illinois vote in 2024?
In 2024, Rock Island County, Illinois voted Democratic by 9.6 points (D+9.6), carried by the Democratic candidate. Out of 63,458 votes cast, 34,126 went Democratic and 28,061 went Republican.
When did Rock Island County, Illinois last vote Republican?
The most recent presidential election in which Rock Island County, Illinois voted Republican was 1980.
How many people live in Rock Island County, Illinois?
Rock Island County, Illinois has a population of 142,757 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Rock Island County, Illinois?
Median household income in Rock Island County, Illinois is $67,159 — below the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Rock Island County, Illinois?
Akashic tracks 38 presidential elections in Rock Island County, Illinois from 1876 to 2024. Of those, 20 went Democratic and 13 went Republican.