Jefferson County, Illinois
Jefferson County is a county located in the southern part of the U.S. state of Illinois. In the 2010 census, the population was 38,827.[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 (2010) | |
| • Total | 38,827 |
| • Estimate (2018) | 37,820 |
| • Density | 66/sq mi (26/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | 12th |
| Website | www |
References
- "State & County QuickFacts". United States Census Bureau. Archived from the original on June 6, 2011. Retrieved July 6, 2014.
- "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
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