Guernsey County, Ohio
County seat: Cambridge · Population 38,379 (2025) · 522 sq mi
Guernsey County is the 64th most populous of Ohio's 88 counties, with 38,379 people (2025 estimate). Its county seat is Cambridge. The map shows its 9 cities and towns and the 6 neighboring counties.
Guernsey County facts
- County seat
- Cambridge
- Population (2025 estimate)
- 38,379 −0.2% since 2020
- Land area
- 522 sq mi 22nd largest of 88
- Water area
- 6 sq mi
- Population density
- 74 per sq mi
- Established
- 1810
- Named after
- Guernsey one of the Channel Islands, part of the Bailiwick of Guernsey, which is one of the British Crown Dependencies
- Largest city
- Cambridge 10,055
- Median household income
- $58,478
- Cities and towns
- 9 plus 3 CDPs
- ZIP codes
- 20
- Time zone
- Eastern
- FIPS code
- 39059
Cities and towns in Guernsey County
Guernsey County has 9 incorporated cities, towns and villages. Populations count the people living inside Guernsey County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Cambridge (county seat) | City | 10,055 | |
| Byesville | Village | 2,359 | |
| Senecaville | Village | 407 | |
| Pleasant City | Village | 396 | |
| Quaker City | Village | 375 | |
| Cumberland | Village | 314 | |
| Lore City | Village | 280 | |
| Old Washington | Village | 227 | |
| Fairview | Village | 68 | Belmont County |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Buffalo | 936 | |
| Kimbolton | 135 | |
| Salesville | 100 |
ZIP codes in Guernsey County
20 ZIP codes reach into Guernsey County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 43722
- 43723
- 43724 also Noble and Morgan counties
- 43725
- 43732 also Noble and Muskingum counties
- 43733
- 43736
- 43749 also Coshocton and Tuscarawas counties
- 43750
- 43755
- 43762 also Muskingum County
- 43768
- 43772 also Noble County
- 43773 also Noble and Monroe counties
- 43778 also Noble County
- 43780 also Noble County
- 43832 also Tuscarawas and Coshocton counties
- 43837 also Tuscarawas County
- 43973 also Harrison and Tuscarawas counties
- 43983 also Belmont and Harrison counties
Population of Guernsey County, 2020–2025
Guernsey County shrank by 60 people (−0.2%) between April 2020 and July 2025: 708 more deaths than births and a net gain of 635 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 38,426 |
| 2021 | 38,298 |
| 2022 | 38,056 |
| 2023 | 38,132 |
| 2024 | 38,329 |
| 2025 | 38,379 |
Neighboring counties
- Noble County south · 14,276 people
- Muskingum County west · 87,014 people
- Belmont County east · 64,434 people
- Tuscarawas County north · 92,373 people
- Coshocton County northwest · 37,188 people
- Harrison County northeast · 14,070 people
Printable Guernsey County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (108 KB)
- PNG (2400 px) (76 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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