Marion County, Ohio
County seat: Marion · Population 65,115 (2025) · 404 sq mi
Marion County is the 37th most populous of Ohio's 88 counties, with 65,115 people (2025 estimate). Its county seat is Marion. The map shows its 8 cities and towns and the 6 neighboring counties.
Marion County facts
- County seat
- Marion
- Population (2025 estimate)
- 65,115 −0.4% since 2020
- Land area
- 404 sq mi 75th largest of 88
- Water area
- 0 sq mi
- Population density
- 161 per sq mi
- Established
- 1820
- Named after
- Francis Marion American politician, Continental Army officer (1732-1795)
- Largest city
- Marion 35,587
- Median household income
- $59,371
- Cities and towns
- 8
- ZIP codes
- 14
- Time zone
- Eastern
- FIPS code
- 39101
Cities and towns in Marion County
Marion County has 8 incorporated cities, towns and villages. Populations count the people living inside Marion County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Marion (county seat) | City | 35,587 | |
| Prospect | Village | 1,056 | |
| La Rue | Village | 674 | |
| Caledonia | Village | 559 | |
| New Bloomington | Village | 418 | |
| Morral | Village | 367 | |
| Waldo | Village | 320 | |
| Green Camp | Village | 305 |
ZIP codes in Marion County
14 ZIP codes reach into Marion County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 43302 also Crawford and Union counties
- 43314 also Crawford and Morrow counties
- 43315 also Morrow County
- 43322
- 43323 also Wyandot County
- 43326 also Hardin County
- 43332 also Hardin and Wyandot counties
- 43337 also Wyandot County
- 43341
- 43342 also Union and Delaware counties
- 43344 also Union and Delaware counties
- 43356 also Delaware and Morrow counties
- 44833 also Morrow, Crawford and Richland counties
- 44849 also Wyandot and Crawford counties
Population of Marion County, 2020–2025
Marion County shrank by 237 people (−0.4%) between April 2020 and July 2025: 912 more deaths than births and a net gain of 602 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 65,385 |
| 2021 | 65,285 |
| 2022 | 64,538 |
| 2023 | 64,768 |
| 2024 | 64,877 |
| 2025 | 65,115 |
Neighboring counties
- Morrow County east · 36,305 people
- Wyandot County northwest · 21,567 people
- Union County southwest · 73,446 people
- Crawford County northeast · 41,896 people
- Hardin County west · 30,072 people
- Delaware County south · 242,032 people
Printable Marion 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) (84 KB)
- PNG (2400 px) (59 KB)
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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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