Warren County, Illinois
Precinct data
Results by precinct
56 precincts · 7,512 votes
Precinct boundaries and identifiers are cycle-specific. This table does not join rows across years without a validated crosswalk.
| Precinct -MONMOUTH 12-2/5MONMOUTH 12-2/5 | 200 | 374 | 19 | 593 | 33.7% | 63.1% | R+29.3 |
|---|---|---|---|---|---|---|---|
| Precinct -TOMPKINS 1-6TOMPKINS 1-6 | 123 | 294 | 9 | 426 | 28.9% | 69.0% | R+40.1 |
| Precinct -MONMOUTH 6-3MONMOUTH 6-3 | 184 | 193 | 21 | 398 | 46.2% | 48.5% | R+2.3 |
| Precinct -MONMOUTH 4-3MONMOUTH 4-3 | 188 | 185 | 11 | 384 | 49.0% | 48.2% | D+0.8 |
| Precinct -MONMOUTH 3-3MONMOUTH 3-3 | 156 | 202 | 17 | 375 | 41.6% | 53.9% | R+12.3 |
| Precinct -MONMOUTH 9-4MONMOUTH 9-4 | 145 | 200 | 16 | 361 | 40.2% | 55.4% | R+15.2 |
| Precinct -ROSEVILLE 1-1ROSEVILLE 1-1 | 125 | 210 | 13 | 348 | 35.9% | 60.3% | R+24.4 |
| Precinct -MONMOUTH 5-4MONMOUTH 5-4 | 115 | 193 | 13 | 321 | 35.8% | 60.1% | R+24.3 |
| Precinct -GREENBUSH 1-1GREENBUSH 1-1 | 86 | 229 | 4 | 319 | 27.0% | 71.8% | R+44.8 |
| Precinct -MONMOUTH 11-3MONMOUTH 11-3 | 157 | 153 | 6 | 316 | 49.7% | 48.4% | D+1.3 |
| Precinct -SPRING GROVE-ALEXIS 1-2SPRING GROVE-ALEXIS 1-2 | 84 | 185 | 4 | 273 | 30.8% | 67.8% | R+37.0 |
| Precinct -COLDBROOK 1-2COLDBROOK 1-2 | 85 | 170 | 6 | 261 | 32.6% | 65.1% | R+32.6 |
| Precinct -MONMOUTH 10-4MONMOUTH 10-4 | 110 | 141 | 6 | 257 | 42.8% | 54.9% | R+12.1 |
| Precinct -FLOYD 1-1FLOYD 1-1 | 81 | 160 | 4 | 245 | 33.1% | 65.3% | R+32.2 |
| Precinct -MONMOUTH 7-4MONMOUTH 7-4 | 107 | 120 | 15 | 242 | 44.2% | 49.6% | R+5.4 |
| Precinct -KELLY 1-2KELLY 1-2 | 91 | 145 | 5 | 241 | 37.8% | 60.2% | R+22.4 |
| Precinct -ROSEVILLE 2-1ROSEVILLE 2-1 | 58 | 177 | 6 | 241 | 24.1% | 73.4% | R+49.4 |
| Precinct -SPRING GROVE-GERLAW 2-2SPRING GROVE-GERLAW 2-2 | 63 | 161 | 11 | 235 | 26.8% | 68.5% | R+41.7 |
| Precinct -SUMNER 1-7/8SUMNER 1-7/8 | 76 | 148 | 9 | 233 | 32.6% | 63.5% | R+30.9 |
| Precinct -MONMOUTH 2-4MONMOUTH 2-4 | 106 | 102 | 3 | 211 | 50.2% | 48.3% | D+1.9 |
| Precinct -HALE 1-7HALE 1-7 | 52 | 147 | 4 | 203 | 25.6% | 72.4% | R+46.8 |
| Precinct -LENOX 1-1LENOX 1-1 | 29 | 144 | 2 | 175 | 16.6% | 82.3% | R+65.7 |
| Precinct -BERWICK 1-1BERWICK 1-1 | 40 | 131 | 3 | 174 | 23.0% | 75.3% | R+52.3 |
| Precinct -MONMOUTH 8-5MONMOUTH 8-5 | 81 | 88 | 5 | 174 | 46.6% | 50.6% | R+4.0 |
| Precinct -MONMOUTH 1-3MONMOUTH 1-3 | 72 | 85 | 4 | 161 | 44.7% | 52.8% | R+8.1 |
| Precinct -ELLISON 1-6ELLISON 1-6 | 36 | 109 | 5 | 150 | 24.0% | 72.7% | R+48.7 |
| Precinct -SWAN 1-1SWAN 1-1 | 39 | 77 | 2 | 118 | 33.1% | 65.3% | R+32.2 |
| Precinct -POINT PLEASANT 1-6POINT PLEASANT 1-6 | 19 | 55 | 3 | 77 | 24.7% | 71.4% | R+46.8 |
| BERWICK Voting District17_17187BE01 | 0 | 0 | 0 | 0 | — | — | Even |
| COLDBROOK Voting District17_17187CO01 | 0 | 0 | 0 | 0 | — | — | Even |
| ELLISON Voting District17_17187EL01 | 0 | 0 | 0 | 0 | — | — | Even |
| FLOYD Voting District17_17187FL01 | 0 | 0 | 0 | 0 | — | — | Even |
| GREENBUSH Voting District17_17187GR01 | 0 | 0 | 0 | 0 | — | — | Even |
| HALE Voting District17_17187HA01 | 0 | 0 | 0 | 0 | — | — | Even |
| KELLY Voting District17_17187KE01 | 0 | 0 | 0 | 0 | — | — | Even |
| LENOX Voting District17_17187LE01 | 0 | 0 | 0 | 0 | — | — | Even |
| MONMOUTH 1 Voting District17_17187MN01 | 0 | 0 | 0 | 0 | — | — | Even |
| MONMOUTH 10 Voting District17_17187MN10 | 0 | 0 | 0 | 0 | — | — | Even |
| MONMOUTH 11 Voting District17_17187MN11 | 0 | 0 | 0 | 0 | — | — | Even |
| MONMOUTH 12 Voting District17_17187MN12 | 0 | 0 | 0 | 0 | — | — | Even |
| MONMOUTH 2 Voting District17_17187MN02 | 0 | 0 | 0 | 0 | — | — | Even |
| MONMOUTH 3 Voting District17_17187MN03 | 0 | 0 | 0 | 0 | — | — | Even |
| MONMOUTH 4 Voting District17_17187MN04 | 0 | 0 | 0 | 0 | — | — | Even |
| MONMOUTH 5 Voting District17_17187MN05 | 0 | 0 | 0 | 0 | — | — | Even |
| MONMOUTH 6 Voting District17_17187MN06 | 0 | 0 | 0 | 0 | — | — | Even |
| MONMOUTH 7 Voting District17_17187MN07 | 0 | 0 | 0 | 0 | — | — | Even |
| MONMOUTH 8 Voting District17_17187MN08 | 0 | 0 | 0 | 0 | — | — | Even |
| MONMOUTH 9 Voting District17_17187MN09 | 0 | 0 | 0 | 0 | — | — | Even |
| POINT PLEASANT Voting District17_17187PP01 | 0 | 0 | 0 | 0 | — | — | Even |
| ROSEVILLE 1 Voting District17_17187RO01 | 0 | 0 | 0 | 0 | — | — | Even |
| ROSEVILLE 2 Voting District17_17187RO02 | 0 | 0 | 0 | 0 | — | — | Even |
| SPRING GROVE-ALEXIS Voting District17_17187SA01 | 0 | 0 | 0 | 0 | — | — | Even |
| SPRING GROVE-GERLAW Voting District17_17187SG01 | 0 | 0 | 0 | 0 | — | — | Even |
| SUMNER Voting District17_17187SU01 | 0 | 0 | 0 | 0 | — | — | Even |
| SWAN Voting District17_17187SW01 | 0 | 0 | 0 | 0 | — | — | Even |
| TOMPKINS Voting District17_17187TO01 | 0 | 0 | 0 | 0 | — | — | Even |
Presidential margin, 1892–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1892 | −8.0% |
| 1896 | −12.9% |
| 1900 | −17.6% |
| 1904 | −34.5% |
| 1908 | −15.8% |
| 1912 | +19.5% |
| 1916 | −16.1% |
| 1920 | −44.8% |
| 1924 | −42.1% |
| 1928 | −48.7% |
| 1932 | +1.0% |
| 1936 | −12.1% |
| 1940 | −22.9% |
| 1944 | −28.6% |
| 1948 | −33.1% |
| 1952 | −45.9% |
| 1956 | −43.3% |
| 1960 | −30.6% |
| 1964 | −5.9% |
| 1968 | −28.5% |
| 1972 | −40.5% |
| 1976 | −20.5% |
| 1980 | −32.1% |
| 1984 | −27.5% |
| 1988 | −11.7% |
| 1992 | +4.0% |
| 1996 | +7.3% |
| 2000 | −4.9% |
| 2004 | −6.3% |
| 2008 | +8.1% |
| 2012 | +5.4% |
| 2016 | −16.5% |
| 2020 | −20.0% |
| 2024 | −25.1% |
U.S. Senate
| Year | Won | Democratic | Republican | Total |
|---|---|---|---|---|
| 2022 | R | 37.5%2,198 | 60.6%3,545 | 5,854 |
| 2020 | R | 39.1%3,049 | 58.4%4,552 | 7,797 |
Registered voters
Total registered voters, over time
| Year | Total registered |
|---|---|
| 2016 | 12,457 |
| 2018 | 11,814 |
| 2020 | 12,159 |
| 2022 | 12,054 |
| 2024 | 11,011 |
Who moves in and out
Net migration over time, and who arrivals are — where they came from and what those places vote
+82 net domestic migration · 2025
Net −2,259 over 2011–2025 · gain loss
Arrivals reported $45,654 in average income, against $68,210 for residents who stayed — 33% lower. (IRS SOI, 2022–23)
The places arrivals came from lean R+19.8 on average — 5.3 points more Democratic-leaning than Warren County, IL itself (R+25.1).
Where arrivals came from lean of each source
- Knox County, IL62R+9.4
- Mercer County, IL26R+27.1
- Henderson County, IL24R+38.8
Where departures went households, 2022–23
- Knox County, IL88
- McDonough County, IL29
- Rock Island County, IL21
Migration is one input to a place’s political change, not its cause — a shift can also come from residents changing their minds, generational turnover, or turnout. These figures describe the places people moved between; they do not measure how any mover voted.
| Year | Net domestic migration |
|---|---|
| 2011 | +80 |
| 2012 | −168 |
| 2013 | −168 |
| 2014 | −25 |
| 2015 | −331 |
| 2016 | −246 |
| 2017 | −234 |
| 2018 | −212 |
| 2019 | −212 |
| 2021 | −183 |
| 2022 | −360 |
| 2023 | −186 |
| 2024 | −96 |
| 2025 | +82 |
Warren County's population has declined steadily as agriculture consolidates, leaving a smaller, older, and more reliably Republican electorate. In 2024 the GOP presidential margin reached 25 points, up sharply from the single-digit gaps of two decades ago.
Across the recorded series it reached a Democratic high of 19.5 points in 1912 and a Republican high of 48.7 points in 1928. Between 2020 and 2024 the county moved 5.1 points toward the Republican candidate; the 2024 margin was 25.1 points.
A population of 16,447, a 81% non-Hispanic-white share, and a median household income of $67,385 describe the county. The county's voting pattern over the last decade is most similar to that of Knox County and Mercer County.
The counties whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
Browse places by community — income, education, race & ethnicity, language — all community cuts →
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 →
Warren County, Illinois. Akashic. https://akashic.app/county/17187/. Accessed May 20, 2026. License: CC BY 4.0.