Hamilton County, Illinois

Hamilton County
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Coordinates: 38°05′N 88°32′W / 38.08°N 88.54°W / 38.08; -88.54
Country United States
State Illinois
Founded1821
Named afterAlexander Hamilton
SeatMcLeansboro
Largest cityMcLeansboro
Area
  Total
436 sq mi (1,130 km2)
  Land435 sq mi (1,130 km2)
  Water1.2 sq mi (3 km2)
Population
 (2020)
  Total
7,993
  Estimate 
(2023)
7,911
  Density18/sq mi (7.1/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district12th
Websitewww.hamiltoncountyillinois.com

Hamilton County is a county located in the U.S. state of Illinois. As of the 2020 census, its population was 7,993. Its county seat is McLeansboro. It is located in the southern portion of the state, known locally as "Little Egypt".