Mercer County, Illinois
Precinct data
Results by precinct
52 precincts · 8,414 votes
Precinct boundaries and identifiers are cycle-specific. This table does not join rows across years without a validated crosswalk.
| Precinct -RICHLAND GROVE 1RICHLAND GROVE 1 | 223 | 378 | 17 | 618 | 36.1% | 61.2% | R+25.1 |
|---|---|---|---|---|---|---|---|
| Precinct -RIVOLIRIVOLI | 183 | 364 | 20 | 567 | 32.3% | 64.2% | R+31.9 |
| Precinct -NEW BOSTONNEW BOSTON | 192 | 342 | 20 | 554 | 34.7% | 61.7% | R+27.1 |
| Precinct -PREEMPTION 1PREEMPTION 1 | 180 | 305 | 14 | 499 | 36.1% | 61.1% | R+25.1 |
| Precinct -MERCER 1MERCER 1 | 218 | 229 | 14 | 461 | 47.3% | 49.7% | R+2.4 |
| Precinct -RICHLAND GROVE 3RICHLAND GROVE 3 | 146 | 287 | 13 | 446 | 32.7% | 64.3% | R+31.6 |
| Precinct -GREENE 1GREENE 1 | 165 | 258 | 15 | 438 | 37.7% | 58.9% | R+21.2 |
| Precinct -PREEMPTION 2PREEMPTION 2 | 144 | 278 | 11 | 433 | 33.3% | 64.2% | R+30.9 |
| Precinct -GREENE 2GREENE 2 | 144 | 233 | 9 | 386 | 37.3% | 60.4% | R+23.1 |
| Precinct -MERCER 5MERCER 5 | 141 | 211 | 13 | 365 | 38.6% | 57.8% | R+19.2 |
| Precinct -MERCER 2MERCER 2 | 151 | 182 | 21 | 354 | 42.7% | 51.4% | R+8.8 |
| Precinct -MILLERSBURGMILLERSBURG | 95 | 233 | 8 | 336 | 28.3% | 69.3% | R+41.1 |
| Precinct -MERCER 3MERCER 3 | 138 | 171 | 10 | 319 | 43.3% | 53.6% | R+10.3 |
| Precinct -PERRYTONPERRYTON | 90 | 202 | 5 | 297 | 30.3% | 68.0% | R+37.7 |
| Precinct -RICHLAND GROVE 2RICHLAND GROVE 2 | 99 | 187 | 6 | 292 | 33.9% | 64.0% | R+30.1 |
| Precinct -SUEZSUEZ | 96 | 178 | 9 | 283 | 33.9% | 62.9% | R+29.0 |
| Precinct -KEITHSBURGKEITHSBURG | 96 | 172 | 14 | 282 | 34.0% | 61.0% | R+27.0 |
| Precinct -MERCER 4MERCER 4 | 116 | 161 | 4 | 281 | 41.3% | 57.3% | R+16.0 |
| Precinct -MERCER 6MERCER 6 | 66 | 170 | 5 | 241 | 27.4% | 70.5% | R+43.2 |
| Precinct -NORTH HENDERSONNORTH HENDERSON | 89 | 142 | 8 | 239 | 37.2% | 59.4% | R+22.2 |
| Precinct -ELIZAELIZA | 42 | 185 | 1 | 228 | 18.4% | 81.1% | R+62.7 |
| Precinct -ABINGTONABINGTON | 56 | 135 | 11 | 202 | 27.7% | 66.8% | R+39.1 |
| Precinct -DUNCANDUNCAN | 37 | 122 | 6 | 165 | 22.4% | 73.9% | R+51.5 |
| Precinct -OHIO GROVEOHIO GROVE | 40 | 85 | 3 | 128 | 31.3% | 66.4% | R+35.2 |
| ABINGTON Voting District17_1713101001 | 0 | 0 | 0 | 0 | — | — | Even |
| DUNCAN Voting District17_1713101201 | 0 | 0 | 0 | 0 | — | — | Even |
| ELIZA Voting District17_1713101501 | 0 | 0 | 0 | 0 | — | — | Even |
| GREENE 1 Voting District17_1713100501 | 0 | 0 | 0 | 0 | — | — | Even |
| GREENE 2 Voting District17_1713100502 | 0 | 0 | 0 | 0 | — | — | Even |
| KEITHSBURG 1 Voting District17_1713101301 | 0 | 0 | 0 | 0 | — | — | Even |
| KEITHSBURG 2 Voting District17_1713101302 | 0 | 0 | 0 | 0 | — | — | Even |
| MERCER 1 Voting District17_1713100801 | 0 | 0 | 0 | 0 | — | — | Even |
| MERCER 2 Voting District17_1713100802 | 0 | 0 | 0 | 0 | — | — | Even |
| MERCER 3 Voting District17_1713100803 | 0 | 0 | 0 | 0 | — | — | Even |
| MERCER 4 Voting District17_1713100804 | 0 | 0 | 0 | 0 | — | — | Even |
| MERCER 5 Voting District17_1713100805 | 0 | 0 | 0 | 0 | — | — | Even |
| MERCER 6 Voting District17_1713100806 | 0 | 0 | 0 | 0 | — | — | Even |
| MILLERSBURG Voting District17_1713101101 | 0 | 0 | 0 | 0 | — | — | Even |
| NEW BOSTON 1 Voting District17_1713101401 | 0 | 0 | 0 | 0 | — | — | Even |
| NEW BOSTON 2 Voting District17_1713101402 | 0 | 0 | 0 | 0 | — | — | Even |
| NORTH HENDERSON Voting District17_1713100101 | 0 | 0 | 0 | 0 | — | — | Even |
| OHIO GROVE Voting District17_1713100701 | 0 | 0 | 0 | 0 | — | — | Even |
| PERRYTON Voting District17_1713100901 | 0 | 0 | 0 | 0 | — | — | Even |
| PREEMPTION 1 Voting District17_1713100601 | 0 | 0 | 0 | 0 | — | — | Even |
| PREEMPTION 2 Voting District17_1713100602 | 0 | 0 | 0 | 0 | — | — | Even |
| RICHLAND GROVE 1 Voting District17_1713100301 | 0 | 0 | 0 | 0 | — | — | Even |
| RICHLAND GROVE 2 Voting District17_1713100302 | 0 | 0 | 0 | 0 | — | — | Even |
| RICHLAND GROVE 3 Voting District17_1713100303 | 0 | 0 | 0 | 0 | — | — | Even |
| RIVOLI 1 Voting District17_1713100201 | 0 | 0 | 0 | 0 | — | — | Even |
| RIVOLI 2 Voting District17_1713100202 | 0 | 0 | 0 | 0 | — | — | Even |
| SUEZ 1 Voting District17_1713100401 | 0 | 0 | 0 | 0 | — | — | Even |
| SUEZ 2 Voting District17_1713100402 | 0 | 0 | 0 | 0 | — | — | Even |
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% |
U.S. Senate
| Year | Won | Democratic | Republican | Total |
|---|---|---|---|---|
| 2022 | R | 38.0%2,559 | 58.6%3,945 | 6,732 |
| 2020 | R | 39.1%3,420 | 58.0%5,068 | 8,744 |
Registered voters
Total registered voters, over time
| Year | Total registered |
|---|---|
| 2016 | 12,621 |
| 2018 | 12,777 |
| 2020 | 13,069 |
| 2022 | 12,921 |
| 2024 | 13,021 |
Who moves in and out
Net migration over time, and who arrivals are — where they came from and what those places vote
−13 net domestic migration · 2025
Net −683 over 2011–2025 · gain loss
Arrivals reported $54,912 in average income, against $80,649 for residents who stayed — 32% lower. (IRS SOI, 2022–23)
The places arrivals came from lean D+1.0 on average — 28 points more Democratic-leaning than Mercer County, IL itself (R+27.1).
Where arrivals came from lean of each source
- Rock Island County, IL125D+9.6
- Scott County, IA38R+3.9
- Henry County, IL27R+24.4
- Knox County, IL20R+9.4
Where departures went households, 2022–23
- Rock Island County, IL108
- Scott County, IA40
- Knox County, IL29
- Warren County, IL26
- Henry County, IL25
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 | −81 |
| 2012 | −139 |
| 2013 | −51 |
| 2014 | −149 |
| 2015 | −121 |
| 2016 | −85 |
| 2017 | +41 |
| 2018 | +6 |
| 2019 | −60 |
| 2021 | +26 |
| 2022 | +40 |
| 2023 | +23 |
| 2024 | −120 |
| 2025 | −13 |
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 Henry County and Henderson 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 →
Mercer County, Illinois. Akashic. https://akashic.app/county/17131/. Accessed May 20, 2026. License: CC BY 4.0.