Allen County, Indiana
County seat: Fort Wayne · Population 402,329 (2025) · 657 sq mi
Allen County is the 3rd most populous of Indiana's 92 counties, with 402,329 people (2025 estimate). Its county seat is Fort Wayne. It is part of the Northeast (Region 3) region, one of the 12 Indiana economic growth regions (DWD / WorkOne regions). The map shows its 8 cities and towns and the 9 neighboring counties.
Allen County facts
- County seat
- Fort Wayne
- Population (2025 estimate)
- 402,329 +4.4% since 2020
- Land area
- 657 sq mi 1st largest of 92
- Water area
- 3 sq mi
- Population density
- 612 per sq mi
- Established
- 1824
- Named after
- John Allen American politician and army officer (1771–1813)
- Largest city
- Fort Wayne 275,203
- Median household income
- $70,737
- Cities and towns
- 8 plus 6 CDPs
- ZIP codes
- 33
- Time zone
- Eastern
- FIPS code
- 18003
Cities and towns in Allen County
Allen County has 8 incorporated cities, towns and villages. Populations count the people living inside Allen County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Fort Wayne (county seat) | City | 275,203 | |
| New Haven | City | 16,337 | |
| Huntertown | Town | 11,600 | |
| Leo-Cedarville | Town | 3,790 | |
| Woodburn | City | 1,628 | |
| Monroeville | Town | 1,355 | |
| Grabill | Town | 1,168 | |
| Zanesville | Town | 118 | Wells County |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Harlan | 1,254 | |
| Hoagland | 845 | |
| Lake Everett | 368 | |
| Hessen Cassel | 261 | |
| Arcola | 201 | |
| Maples | 44 |
ZIP codes in Allen County
33 ZIP codes reach into Allen County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 46704
- 46706 also DeKalb County
- 46723 also Whitley and Noble counties
- 46733 also Adams County
- 46741
- 46743
- 46745
- 46748 also Noble and DeKalb counties
- 46765
- 46773 also Adams County
- 46774
- 46777 also Wells and Adams counties
- 46783 also Huntington, Whitley and Wells counties
- 46788 also DeKalb County
- 46797
- 46798 also Wells County
- 46799 also Wells County
- 46802
- 46803
- 46804
- 46805
- 46806
- 46807
- 46808
- 46809
- 46814 also Whitley County
- 46815
- 46816
- 46818 also Whitley County
- 46819
- 46825
- 46835
- 46845
Population of Allen County, 2020–2025
Allen County grew by 16,912 people (+4.4%) between April 2020 and July 2025: 7,099 more births than deaths and a net gain of 9,702 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 386,107 |
| 2021 | 389,023 |
| 2022 | 391,751 |
| 2023 | 394,845 |
| 2024 | 399,094 |
| 2025 | 402,329 |
Neighboring counties
- DeKalb County north · 44,535 people
- Whitley County west · 35,046 people
- Paulding County, Ohio east · 18,727 people
- Adams County south · 36,650 people
- Wells County south · 28,883 people
- Huntington County southwest · 37,224 people
- Noble County northwest · 47,937 people
- Van Wert County, Ohio southeast · 29,013 people
- Defiance County, Ohio northeast · 38,292 people
Printable Allen 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) (90 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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