Hamilton County, Illinois

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Hamilton County is a county located in the U.S. state of Illinois. As of 2000, the population was 8,621. Its county seat is McLeansboro, Illinois[1].

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



According to the U.S. Census Bureau, the county has a total area of 436 square miles (1,129.2 km2), of which 435 square miles (1,126.6 km2) is land and 1 square mile (2.6 km2) (0.15%) is water.

Major highways

Adjacent counties


Hamilton County was formed out of White County in 1821. It is named for Alexander Hamilton, Revolutionary War hero and the first United States Secretary of the Treasury.

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