county in Illinois, United States From Wikipedia, the free encyclopedia
Jefferson County is a county located in the southern part of the U.S. state of Illinois. In the 2020 census, the population was 37,113.[1] The county seat is Mount Vernon.[2]
Jefferson County | |
|---|---|
Jefferson County Courthouse in Mount Vernon | |
 Location within the U.S. state of Illinois | |
 Illinois's location within the U.S. | |
| Coordinates: 38°18′N 88°55′W | |
| Country |  United States |
| State |  Illinois |
| Founded | 1819 |
| Named for | Thomas Jefferson |
| Seat | Mount Vernon |
| Largest city | Mount Vernon |
| Area | |
| • Total | 584 sq mi (1,510 km2) |
| • Land | 571 sq mi (1,480 km2) |
| • Water | 13 sq mi (30 km2) 2.2% |
| Population | |
| • Total | 37,113 |
| • Density | 64/sq mi (25/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Website | www |
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