Jersey County, Illinois
County seat: Jerseyville · Population 21,160 (2025) · 370 sq mi
Jersey County is the 54th most populous of Illinois's 102 counties, with 21,160 people (2025 estimate). Its county seat is Jerseyville. It is part of the Southwest region, one of the 10 Illinois economic development regions (DCEO). The map shows its 8 cities and towns and the 5 neighboring counties.
Jersey County facts
- County seat
- Jerseyville
- Population (2025 estimate)
- 21,160 −1.7% since 2020
- Land area
- 370 sq mi 81st largest of 102
- Water area
- 8 sq mi
- Population density
- 57 per sq mi
- Established
- 1839
- Named after
- New Jersey state of the United States of America
- Largest city
- Jerseyville 8,409
- Median household income
- $80,361
- Cities and towns
- 8
- ZIP codes
- 11
- Time zone
- Central
- FIPS code
- 17083
Cities and towns in Jersey County
Jersey County has 8 incorporated cities, towns and villages. Populations count the people living inside Jersey County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Jerseyville (county seat) | City | 8,409 | |
| Grafton | City | 773 | |
| Elsah | Village | 539 | |
| Brighton | Village | 298 | Macoupin County |
| Fieldon | Village | 159 | |
| Fidelity | Village | 96 | |
| Otterville | Town | 82 | |
| Medora | Village | 4 | Macoupin County |
ZIP codes in Jersey County
11 ZIP codes reach into Jersey County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 62012 also Macoupin and Madison counties
- 62022
- 62028
- 62030
- 62031
- 62035 also Madison County
- 62037
- 62052 also Greene County
- 62054 also Greene County
- 62063 also Macoupin and Greene counties
- 62079 also Macoupin County
Population of Jersey County, 2020–2025
Jersey County shrank by 356 people (−1.7%) between April 2020 and July 2025: 612 more deaths than births and a net gain of 251 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 21,493 |
| 2021 | 21,363 |
| 2022 | 21,222 |
| 2023 | 21,168 |
| 2024 | 21,155 |
| 2025 | 21,160 |
Neighboring counties
- Greene County north · 11,313 people
- Macoupin County northeast · 43,748 people
- Calhoun County west · 4,300 people
- Madison County southeast · 263,110 people
- St. Charles County, Missouri southwest · 426,499 people
Printable Jersey 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) (85 KB)
- PNG (2400 px) (78 KB)
Paste this code to embed the map on your site:
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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