Putnam County, Ohio
County seat: Ottawa · Population 34,380 (2025) · 483 sq mi
Putnam County is the 70th most populous of Ohio's 88 counties, with 34,380 people (2025 estimate). Its county seat is Ottawa. The map shows its 15 cities and towns and the 7 neighboring counties.
Putnam County facts
- County seat
- Ottawa
- Population (2025 estimate)
- 34,380 −0.2% since 2020
- Land area
- 483 sq mi 31st largest of 88
- Water area
- 2 sq mi
- Population density
- 71 per sq mi
- Established
- 1820
- Named after
- Israel Putnam American Revolutionary War general (1718–1790)
- Largest city
- Ottawa 4,437
- Median household income
- $84,928
- Cities and towns
- 15 plus 1 CDPs
- ZIP codes
- 20
- Time zone
- Eastern
- FIPS code
- 39137
Cities and towns in Putnam County
Putnam County has 15 incorporated cities, towns and villages. Populations count the people living inside Putnam County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Ottawa (county seat) | Village | 4,437 | |
| Leipsic | Village | 2,167 | |
| Columbus Grove | Village | 2,132 | |
| Kalida | Village | 1,481 | |
| Pandora | Village | 1,149 | |
| Continental | Village | 1,103 | |
| Glandorf | Village | 985 | |
| Ottoville | Village | 975 | |
| Fort Jennings | Village | 532 | |
| West Leipsic | Village | 218 | |
| Dupont | Village | 208 | |
| Cloverdale | Village | 170 | |
| Gilboa | Village | 168 | |
| Miller City | Village | 132 | |
| Belmore | Village | 63 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Vaughnsville | 160 |
ZIP codes in Putnam County
20 ZIP codes reach into Putnam County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 43516 also Henry, Wood and Hancock counties
- 43548 also Henry and Defiance counties
- 45815
- 45817 also Allen and Hancock counties
- 45827 also Paulding County
- 45830 also Allen County
- 45831 also Defiance and Paulding counties
- 45833 also Allen and Van Wert counties
- 45844 also Van Wert and Allen counties
- 45848
- 45849 also Paulding and Van Wert counties
- 45853
- 45856 also Henry and Hancock counties
- 45864
- 45868 also Hancock County
- 45873 also Paulding County
- 45875
- 45876
- 45877 also Allen and Hancock counties
- 45893
Population of Putnam County, 2020–2025
Putnam County shrank by 61 people (−0.2%) between April 2020 and July 2025: 269 more births than deaths and a net loss of 329 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 34,392 |
| 2021 | 34,343 |
| 2022 | 34,277 |
| 2023 | 34,240 |
| 2024 | 34,160 |
| 2025 | 34,380 |
Neighboring counties
- Allen County south · 100,881 people
- Henry County north · 27,598 people
- Hancock County east · 75,034 people
- Paulding County west · 18,727 people
- Van Wert County southwest · 29,013 people
- Defiance County northwest · 38,292 people
- Wood County northeast · 134,176 people
Printable Putnam 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) (104 KB)
- PNG (2400 px) (69 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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