Knox County, Ohio
County seat: Mount Vernon · Population 64,002 (2025) · 526 sq mi
Knox County is the 39th most populous of Ohio's 88 counties, with 64,002 people (2025 estimate). Its county seat is Mount Vernon. The map shows its 8 cities and towns and the 7 neighboring counties.
Knox County facts
- County seat
- Mount Vernon
- Population (2025 estimate)
- 64,002 +2.1% since 2020
- Land area
- 526 sq mi 21st largest of 88
- Water area
- 4 sq mi
- Population density
- 122 per sq mi
- Established
- 1808
- Named after
- Henry Knox American general and Secretary of War (1750–1806)
- Largest city
- Mount Vernon 17,287
- Median household income
- $73,878
- Cities and towns
- 8 plus 4 CDPs
- ZIP codes
- 16
- Time zone
- Eastern
- FIPS code
- 39083
Cities and towns in Knox County
Knox County has 8 incorporated cities, towns and villages. Populations count the people living inside Knox County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Mount Vernon (county seat) | City | 17,287 | |
| Fredericktown | Village | 2,658 | |
| Gambier | Village | 2,233 | |
| Centerburg | Village | 1,691 | |
| Danville | Village | 1,025 | |
| Martinsburg | Village | 222 | |
| Brinkhaven | Village | 110 | |
| Utica | Village | 19 | Licking County |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Apple Valley | 5,548 | |
| South Mount Vernon | 589 | |
| Bladensburg | 300 | |
| Howard | 269 |
ZIP codes in Knox County
16 ZIP codes reach into Knox County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 43005
- 43006 also Coshocton and Holmes counties
- 43011 also Licking, Morrow and Delaware counties
- 43014 also Coshocton and Ashland counties
- 43019 also Morrow and Richland counties
- 43022
- 43028
- 43037
- 43050 also Morrow County
- 43080 also Licking County
- 43822 also Muskingum, Licking and Coshocton counties
- 43843 also Coshocton County
- 44628 also Holmes County
- 44813 also Richland and Morrow counties
- 44822 also Richland County
- 44842 also Ashland and Holmes counties
Population of Knox County, 2020–2025
Knox County grew by 1,283 people (+2.1%) between April 2020 and July 2025: 190 more deaths than births and a net gain of 1,429 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 62,804 |
| 2021 | 62,505 |
| 2022 | 63,103 |
| 2023 | 63,186 |
| 2024 | 63,564 |
| 2025 | 64,002 |
Neighboring counties
- Licking County south · 185,564 people
- Morrow County northwest · 36,305 people
- Richland County north · 124,893 people
- Coshocton County east · 37,188 people
- Holmes County northeast · 44,970 people
- Ashland County north · 52,523 people
- Delaware County west · 242,032 people
Printable Knox 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) (106 KB)
- PNG (2400 px) (75 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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