Auglaize County, Ohio
County seat: Wapakoneta · Population 45,909 (2025) · 401 sq mi
Auglaize County is the 53rd most populous of Ohio's 88 counties, with 45,909 people (2025 estimate). Its county seat is Wapakoneta. The map shows its 8 cities and towns and the 6 neighboring counties.
Auglaize County facts
- County seat
- Wapakoneta
- Population (2025 estimate)
- 45,909 −1.1% since 2020
- Land area
- 401 sq mi 79th largest of 88
- Water area
- 1 sq mi
- Population density
- 114 per sq mi
- Established
- 1848
- Named after
- Auglaize River river in Ohio, United States
- Largest city
- Wapakoneta 9,711
- Median household income
- $78,660
- Cities and towns
- 8 plus 3 CDPs
- ZIP codes
- 18
- Time zone
- Eastern
- FIPS code
- 39011
Cities and towns in Auglaize County
Auglaize County has 8 incorporated cities, towns and villages. Populations count the people living inside Auglaize County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Wapakoneta (county seat) | City | 9,711 | |
| St. Marys | City | 8,398 | |
| Minster | Village | 3,062 | Shelby County |
| New Bremen | Village | 3,017 | |
| Cridersville | Village | 1,767 | |
| New Knoxville | Village | 912 | |
| Waynesfield | Village | 739 | |
| Buckland | Village | 228 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| New Hampshire | 445 | |
| Uniopolis | 166 | |
| St. Johns | 163 |
ZIP codes in Auglaize County
18 ZIP codes reach into Auglaize County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 43331 also Logan and Hardin counties
- 45306 also Shelby County
- 45334 also Shelby and Logan counties
- 45806 also Allen County
- 45819
- 45845 also Shelby and Mercer counties
- 45850 also Allen and Hardin counties
- 45862 also Mercer County
- 45865 also Shelby and Mercer counties
- 45869 also Shelby and Mercer counties
- 45870
- 45871 also Shelby County
- 45884
- 45885 also Mercer County
- 45887 also Allen, Van Wert and Mercer counties
- 45888
- 45895 also Logan and Allen counties
- 45896 also Hardin and Allen counties
Population of Auglaize County, 2020–2025
Auglaize County shrank by 512 people (−1.1%) between April 2020 and July 2025: 271 more deaths than births and a net loss of 270 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 46,466 |
| 2021 | 46,245 |
| 2022 | 45,896 |
| 2023 | 45,980 |
| 2024 | 45,936 |
| 2025 | 45,909 |
Neighboring counties
- Shelby County south · 48,065 people
- Allen County northeast · 100,881 people
- Mercer County west · 42,737 people
- Logan County southeast · 46,302 people
- Hardin County east · 30,072 people
- Van Wert County northwest · 29,013 people
Printable Auglaize 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) (100 KB)
- PNG (2400 px) (70 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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