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Jefferson County, Illinois

US county information
NameJefferson County
SeatMount Vernon
Largest cityMount Vernon
US Area
Total Area583.71 sq mi (1511.8 km2)
Land Area570.96 sq mi (1478.8 km2)
Water Area12.76 sq mi (33 km2)
Population38827 (2010)
Density27/km2 (70/sq mi)
Time zoneCentral
Time zoneCentral: UTC-6/-5: -6/-5

     Home | County | Jefferson County Illinois

Jefferson County is a county located in the southern part of the U.S. state of Illinois. As of 2010, the population was 38,827. The county seat is Mount Vernon .

Jefferson County is part of the Mount Vernon Micropolitan Statistical Area.

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