Hamilton County, Illinois

county in Illinois, United States

Hamilton County is a county in the U.S. state of Illinois. According to the 2020 census, it has a population of 7,993.[1] Its county seat is McLeansboro.[2] Hamilton County was founded in 1821 and named for Alexander Hamilton, Revolutionary War hero and the first United States Secretary of the Treasury.[3]


  1. "QuickFacts: Hamilton County, Illinois". United States Census Bureau. Retrieved August 11, 2023.
  2. "Find a County". National Association of Counties. Retrieved June 7, 2011.
  3. Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. p. 147.