Jay County, Indiana
County seat: Portland · Population 20,118 (2025) · 384 sq mi
Jay County is the 71st most populous of Indiana's 92 counties, with 20,118 people (2025 estimate). Its county seat is Portland. It is part of the Eastern (Region 6) region, one of the 12 Indiana economic growth regions (DWD / WorkOne regions). The map shows its 6 cities and towns and the 7 neighboring counties.
Jay County facts
- County seat
- Portland
- Population (2025 estimate)
- 20,118 −1.8% since 2020
- Land area
- 384 sq mi 56th largest of 92
- Water area
- 0 sq mi
- Population density
- 52 per sq mi
- Established
- 1835
- Named after
- John Jay Founding Father, U.S. Chief Justice from 1789 to 1795
- Largest city
- Portland 6,237
- Median household income
- $54,969
- Cities and towns
- 6
- ZIP codes
- 9
- Time zone
- Eastern
- FIPS code
- 18075
Cities and towns in Jay County
Jay County has 6 incorporated cities, towns and villages. Populations count the people living inside Jay County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Portland (county seat) | City | 6,237 | |
| Dunkirk | City | 1,969 | Blackford County |
| Redkey | Town | 1,071 | |
| Pennville | Town | 614 | |
| Bryant | Town | 236 | |
| Salamonia | Town | 149 |
ZIP codes in Jay County
9 ZIP codes reach into Jay County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 47320 also Delaware and Randolph counties
- 47326 also Adams County
- 47336 also Delaware and Blackford counties
- 47369 also Blackford County
- 47371 also Randolph County
- 47373 also Randolph County
- 47380 also Randolph County
- 47381
- 47390 also Randolph County
Population of Jay County, 2020–2025
Jay County shrank by 361 people (−1.8%) between April 2020 and July 2025: 98 more births than deaths and a net loss of 458 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 20,480 |
| 2021 | 20,294 |
| 2022 | 20,138 |
| 2023 | 20,097 |
| 2024 | 20,259 |
| 2025 | 20,118 |
Neighboring counties
- Randolph County south · 24,438 people
- Mercer County, Ohio east · 42,737 people
- Adams County north · 36,650 people
- Blackford County west · 11,730 people
- Wells County northwest · 28,883 people
- Delaware County southwest · 113,106 people
- Darke County, Ohio southeast · 51,520 people
Printable Jay 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) (78 KB)
- PNG (2400 px) (60 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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