Jefferson County, Illinois
county in Illinois, United States
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 / 38.3°N 88.92°W | |
Country | ![]() |
State | ![]() |
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 |
References
change- ↑ 1.0 1.1 "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.