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Jefferson County, Missouri

US county information
NameJefferson County
StateMissouri
SeatHillsboro
Largest cityArnold
US Area
Total Area664.09 sq mi (1720 km2)
Land Area656.80 sq mi (1701.1 km2)
Water Area7.29 sq mi (18.9 km2)
Population218733 (2010)
Density128.52/km2 (332.9/sq mi)
Founded1818

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Jefferson County is a county located in East Central Missouri in the United States. The county was included as the mean center of U.S. population in 1980. It is the sixth most-populous county in Missouri. Census 2010 put the population at 218,733 Its county seat is Hillsboro. The county was organized in 1818 and named in honor of former President Thomas Jefferson.

Jefferson County is part of the St. Louis Metro Area and consists of many of the southern suburbs of St. Louis.


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