Voter file loaded June 5, 2026 · figures are from that file, held as a fixed record
Guernsey County, Ohio has 20,104 active registered voters across 35 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 | PRECINCT RICHLAND | 933 | 646 | 69.24% |
| 2 | PRECINCT LONDONDERRY/WASHINGTON | 535 | 368 | 68.79% |
| 3 | PRECINCT OLD WASHINGTON/WILLS | 816 | 560 | 68.63% |
| 4 | PRECINCT JEFFERSON/MADISON | 579 | 396 | 68.39% |
| 5 | PRECINCT CENTER A | 486 | 331 | 68.11% |
| 6 | PRECINCT CAMBRIDGE 3-A | 647 | 433 | 66.92% |
| 7 | PRECINCT CENTER B | 522 | 348 | 66.67% |
| 8 | PRECINCT QUAKER CITY/MILLWOOD | 537 | 355 | 66.11% |
| 9 | PRECINCT LIBERTY | 561 | 367 | 65.42% |
| 10 | PRECINCT CAMBRIDGE A | 796 | 518 | 65.08% |
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 Guernsey County voted for president
Election results are public records.
Guernsey County at a glance.
Guernsey County had an estimated 38,219 residents in July 2024, the 65th most populous of Ohio's 88 counties, down 0.6% since the 2020 census. Of those, 29,815 are 18 or older, the voting-age population, and 20.7% are 65 or older. Its 20,104 active registered voters equal about 67.4% of that voting-age population.
It covers 522 square miles of land (73 people per square mile). The largest cities and towns are Cambridge (10,036), Byesville (2,347), Senecaville (414), Pleasant City (390) and Quaker City (375). The American Community Survey (2020-2024) puts it at a median age of 42.9, a median household income of $58,478, 15.6% of adults 25 and older holding a bachelor's degree or higher and 72.1% of occupied homes owned by the people living in them.
In 2024, 17,594 votes were cast for president, about 59.0% of the voting-age population; the Democratic ticket took 23.6% and the Republican ticket 75.7%. The two-party margin moved from R+9.1 in 2008 to R+52.1 in 2024.
- Population (2024 estimate)
- 38,219
- Population (2020 census base)
- 38,434
- Voting-age population (18+)
- 29,815
- Active voters per 100 adults
- 67.4
- Residents 65 and older
- 20.7%
- People per square mile
- 73
- Land area
- 522 sq mi
- Median age
- 42.9
- Median household income
- $58,478
- Adults 25+ with a bachelor's degree
- 15.6%
- Owner-occupied homes
- 72.1%
Largest cities and towns
- Cambridge 10,036
- Byesville 2,347
- Senecaville 414
- Pleasant City 390
- Quaker City 375
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 23.6% | 75.7% | R+52.1 | 17,594 |
| 2020 | 25.1% | 73.5% | R+48.4 | 18,230 |
| 2016 | 26.5% | 69.1% | R+42.6 | 16,156 |
| 2012 | 44.1% | 53.7% | R+9.6 | 16,403 |
| 2008 | 44.0% | 53.1% | R+9.1 | 17,325 |
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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