Voter file loaded June 5, 2026 · figures are from that file, held as a fixed record
Hamilton County, Ohio has 482,589 active registered voters across 563 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 | AMBERLEY C | 598 | 487 | 81.44% |
| 2 | SPRINGFIELD BB | 547 | 444 | 81.17% |
| 3 | EVENDALE A | 1,011 | 804 | 79.53% |
| 4 | NORTH BEND A | 659 | 520 | 78.91% |
| 5 | SHARONVILLE 2-A | 723 | 570 | 78.84% |
| 6 | GREEN W | 1,217 | 958 | 78.72% |
| 7 | MONTGOMERY G | 559 | 440 | 78.71% |
| 8 | AMBERLEY D | 783 | 615 | 78.54% |
| 9 | BLUE ASH 3-B | 677 | 530 | 78.29% |
| 10 | DELHI Q | 1,042 | 814 | 78.12% |
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 Hamilton County voted for president
Election results are public records.
Hamilton County at a glance.
Hamilton County had an estimated 837,359 residents in July 2024, the third most populous of Ohio's 88 counties, up 0.8% since the 2020 census. Of those, 647,619 are 18 or older, the voting-age population, and 17.3% are 65 or older. Its 482,589 active registered voters equal about 74.5% of that voting-age population.
It covers 406 square miles of land (2,065 people per square mile). The largest cities and towns are Cincinnati (314,915), Forest Park (20,033), Norwood (19,455), Blue Ash (13,616) and Harrison (13,526). The American Community Survey (2020-2024) puts it at a median age of 36.9, a median household income of $72,470, 41.8% of adults 25 and older holding a bachelor's degree or higher and 59.3% of occupied homes owned by the people living in them.
In 2024, 409,753 votes were cast for president, about 63.3% of the voting-age population; the Democratic ticket took 57.0% and the Republican ticket 42.1%. The two-party margin moved from D+7.0 in 2008 to D+14.9 in 2024.
- Population (2024 estimate)
- 837,359
- Population (2020 census base)
- 830,636
- Voting-age population (18+)
- 647,619
- Active voters per 100 adults
- 74.5
- Residents 65 and older
- 17.3%
- People per square mile
- 2,065
- Land area
- 406 sq mi
- Median age
- 36.9
- Median household income
- $72,470
- Adults 25+ with a bachelor's degree
- 41.8%
- Owner-occupied homes
- 59.3%
Largest cities and towns
- Cincinnati 314,915
- Forest Park 20,033
- Norwood 19,455
- Blue Ash 13,616
- Harrison 13,526
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 57.0% | 42.1% | D+14.9 | 409,753 |
| 2020 | 57.1% | 41.3% | D+15.8 | 430,929 |
| 2016 | 52.6% | 43.0% | D+9.6 | 395,000 |
| 2012 | 51.8% | 46.9% | D+4.9 | 402,572 |
| 2008 | 53.0% | 46.0% | D+7.0 | 425,086 |
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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