Jefferson County, Illinois

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Jefferson County is a county located in the southern part of the U.S. state of Illinois. As of 2000, the population was 40,045. The county seat is Mount Vernon[1].

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



According to the U.S. Census Bureau, the county has a total area of 584 square miles (1,512.6 km2), of which 571 square miles (1,478.9 km2) is land and 13 square miles (33.7 km2) (2.19%) is water.

Major highways

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