Jefferson County, Illinois
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, Illinois | |
| Map | |
 Location in the state of Illinois | |
 Illinois's location in the U.S. | |
| Statistics | |
| Founded | 1819 |
|---|---|
| Seat | Mount Vernon |
| Largest City | Mount Vernon |
| Area - Total - Land - Water |
584 sq mi (1,513 km²) 571 sq mi (1,479 km²) 13 sq mi (34 km²), 2.2 |
| Population - Density |
|
| Time zone | Central: UTC-6/-5 |
| Website: http://www.jeffersoncountyillinois.com/ | |
| Named for: Thomas Jefferson | |
Jefferson County, Illinois Media
Jefferson County between the time of its creation and 1821
Jefferson County between 1821 and 1823
Jefferson County in 1823, reduced to its current size
References
- ↑ "QuickFacts: Jefferson County, Illinois". United States Census Bureau. Retrieved August 14, 2023.
- ↑ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
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