Voter file loaded June 4, 2026 · figures are from that file, held as a fixed record
Butler County, Ohio has 208,818 active registered voters across 292 precincts, as of June 2026.
Party registration
Ohio doesn't register voters by party, so there's no party breakdown to show. Party lean is usually inferred from primary participation; that data is in the voter file and available inside Motion51.
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | MIDD3WD1 | 551 | 452 | 82.03% |
| 2 | FAIRFIELD TWP 17 | 622 | 494 | 79.42% |
| 3 | HAM18WD1 | 1,409 | 1,083 | 76.86% |
| 4 | OXFORD TWP 3 | 883 | 669 | 75.76% |
| 5 | ROSS TWP 2 | 1,119 | 847 | 75.69% |
| 6 | MIDD1WD3 | 590 | 446 | 75.59% |
| 7 | HANOVER TWP 3 | 494 | 373 | 75.51% |
| 8 | SHARON2 | 532 | 401 | 75.38% |
| 9 | WEST CHESTER TWP 41 | 859 | 647 | 75.32% |
| 10 | FAIR11WD3 | 671 | 505 | 75.26% |
Supervoters are active registered voters who cast a ballot in at least 3 of the last 4 November general elections (2018–2024). Percentages are precinct totals from the official state voter file — no individual voter information is shown. Precincts with fewer than 400 active voters are excluded.
How Butler County voted for president
Election results are public records.
Butler County at a glance.
Butler County had an estimated 399,542 residents in July 2024, the seventh most populous of Ohio's 88 counties, up 2.4% since the 2020 census. Of those, 308,520 are 18 or older, the voting-age population, and 16.6% are 65 or older. Its 208,818 active registered voters equal about 67.7% of that voting-age population.
It covers 466 square miles of land (856 people per square mile). The largest cities and towns are Hamilton (63,953), Middletown (part) (48,332), Fairfield (part) (45,094), Oxford (22,585) and Monroe (part) (15,828). The American Community Survey (2020-2024) puts it at a median age of 37.2, a median household income of $81,590, 32.8% of adults 25 and older holding a bachelor's degree or higher and 69.9% of occupied homes owned by the people living in them.
In 2024, 183,142 votes were cast for president, about 59.4% of the voting-age population; the Democratic ticket took 36.4% and the Republican ticket 62.7%. The two-party margin moved from R+22.6 in 2008 to R+26.3 in 2024.
- Population (2024 estimate)
- 399,542
- Population (2020 census base)
- 390,352
- Voting-age population (18+)
- 308,520
- Active voters per 100 adults
- 67.7
- Residents 65 and older
- 16.6%
- People per square mile
- 856
- Land area
- 466 sq mi
- Median age
- 37.2
- Median household income
- $81,590
- Adults 25+ with a bachelor's degree
- 32.8%
- Owner-occupied homes
- 69.9%
Largest cities and towns
- Hamilton 63,953
- Middletown (part) 48,332
- Fairfield (part) 45,094
- Oxford 22,585
- Monroe (part) 15,828
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 36.4% | 62.7% | R+26.3 | 183,142 |
| 2020 | 37.3% | 61.3% | R+24.0 | 186,737 |
| 2016 | 33.7% | 62.0% | R+28.3 | 168,422 |
| 2012 | 36.1% | 62.3% | R+26.2 | 164,020 |
| 2008 | 38.0% | 60.6% | R+22.6 | 173,777 |
Sources: U.S. Census Bureau Vintage 2024 population estimates and 2024 Gazetteer; American Community Survey 2020–2024 5-year estimates; certified county presidential returns. Growth, density and turnout are simple arithmetic on those figures.
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