Jefferson County, Missouri

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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. A 2008 estimate showed the county's population to be 217,679.[1] 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.

Contents

Geography

According to the U.S. Census Bureau, the county has a total area of 664 square miles (1,719.8 km2), of which 657 square miles (1,701.6 km2) is land and 7 square miles (18.1 km2) (1.10%) is water. Much of Jefferson County will be in the totality path of the solar eclipse of August 21, 2017.

Adjacent counties

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