Voter file loaded June 5, 2026 · figures are from that file, held as a fixed record
Warren County, Ohio has 153,870 active registered voters across 185 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 | DEERFIELD TWP O | 684 | 551 | 80.56% |
| 2 | HAMILTON TWP U | 969 | 751 | 77.5% |
| 3 | MASON CITY P | 845 | 648 | 76.69% |
| 4 | SPRINGBORO CITY 1-C | 1,010 | 773 | 76.53% |
| 5 | TURTLECREEK TWP J | 801 | 613 | 76.53% |
| 6 | CLEARCREEK TWP E | 980 | 749 | 76.43% |
| 7 | CLEARCREEK TWP C | 474 | 357 | 75.32% |
| 8 | DEERFIELD TWP BB | 862 | 643 | 74.59% |
| 9 | DEERFIELD TWP T | 821 | 612 | 74.54% |
| 10 | CLEARCREEK TWP F | 753 | 561 | 74.5% |
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 Warren County voted for president
Election results are public records.
Warren County at a glance.
Warren County had an estimated 256,059 residents in July 2024, the tenth most populous of Ohio's 88 counties, up 5.7% since the 2020 census. Of those, 196,435 are 18 or older, the voting-age population, and 16.7% are 65 or older. Its 153,870 active registered voters equal about 78.3% of that voting-age population.
It covers 401 square miles of land (638 people per square mile). The largest cities and towns are Mason (36,046), Lebanon (21,995), Springboro (part) (18,442), Franklin (11,758) and South Lebanon (6,923). The American Community Survey (2020-2024) puts it at a median age of 40.1, a median household income of $110,132, 45.6% of adults 25 and older holding a bachelor's degree or higher and 79.4% of occupied homes owned by the people living in them.
In 2024, 139,593 votes were cast for president, about 71.1% of the voting-age population; the Democratic ticket took 33.8% and the Republican ticket 65.3%. The two-party margin moved from R+36.1 in 2008 to R+31.5 in 2024.
- Population (2024 estimate)
- 256,059
- Population (2020 census base)
- 242,348
- Voting-age population (18+)
- 196,435
- Active voters per 100 adults
- 78.3
- Residents 65 and older
- 16.7%
- People per square mile
- 638
- Land area
- 401 sq mi
- Median age
- 40.1
- Median household income
- $110,132
- Adults 25+ with a bachelor's degree
- 45.6%
- Owner-occupied homes
- 79.4%
Largest cities and towns
- Mason 36,046
- Lebanon 21,995
- Springboro (part) 18,442
- Franklin 11,758
- South Lebanon 6,923
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 33.8% | 65.3% | R+31.5 | 139,593 |
| 2020 | 33.8% | 64.6% | R+30.8 | 136,100 |
| 2016 | 28.9% | 66.5% | R+37.6 | 114,254 |
| 2012 | 29.5% | 69.1% | R+39.6 | 108,008 |
| 2008 | 31.4% | 67.5% | R+36.1 | 106,216 |
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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