Greene County, Illinois

Greene County
Greene County Courthouse
Greene County Courthouse
Map of Illinois highlighting Greene County
Location within the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location within the U.S.
Coordinates: 39°21′N 90°23′W / 39.35°N 90.39°W / 39.35; -90.39
Country United States
State Illinois
Founded1821
Named forNathanael Greene
SeatCarrollton
Largest cityCarrollton
Area
 • Total546 sq mi (1,410 km2)
 • Land543 sq mi (1,410 km2)
 • Water3.3 sq mi (9 km2)  0.6%
Population
 (2020)
 • Total11,843
 • Density22/sq mi (8.4/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district15th
Websitehttps://

Greene County is a county located in the U.S. state of Illinois. According to the 2020 United States Census, it has a population of 11,843.[1] Its county seat is Carrollton.[2]

A notable archaeological area, the Koster Site, has produced evidence of more than 7,000 years of human habitation. Artifacts from the site are displayed at the Center for American Archeology in Kampsville, Illinois.

  1. ^ "U.S. Census Bureau QuickFacts: Greene County, Illinois".
  2. ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.