Jersey County, Illinois
Jersey County is a county located in the U.S. state of Illinois. At the 2020 census, it had a population of 21,512. The county seat and largest community is Jerseyville, with a population of 8,337 in 2010. The county's smallest incorporated community is Otterville, with a population of 87.
Jersey County | |
|---|---|
Jersey County Courthouse in Jerseyville | |
Location within the U.S. state of Illinois | |
Illinois's location within the U.S. | |
| Coordinates: 39°05′N 90°22′W | |
| Country | United States |
| State | Illinois |
| Founded | February 28, 1839 |
| Named for | New Jersey |
| Seat | Jerseyville |
| Largest city | Jerseyville |
| Area | |
| • Total | 377 sq mi (980 km2) |
| • Land | 369 sq mi (960 km2) |
| • Water | 7.9 sq mi (20 km2) 2.1% |
| Population (2020) | |
| • Total | 21,512 |
| • Density | 57/sq mi (22/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | 15th |
| Website | www |
Jersey County is included in the St. Louis, MO-IL Metropolitan Statistical Area.
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