Hancock County, Illinois

Hancock County
Hancock County Courthouse in Carthage
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Coordinates: 40°24′N 91°10′W / 40.4°N 91.17°W / 40.4; -91.17
Country United States
State Illinois
Founded1825
Named afterJohn Hancock
SeatCarthage
Largest cityHamilton
Area
  Total
814 sq mi (2,110 km2)
  Land794 sq mi (2,060 km2)
  Water21 sq mi (50 km2)  2.5%
Population
 (2020)
  Total
17,620
  Estimate 
(2023)
17,186
  Density22/sq mi (8.4/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district15th
Websitewww.hancockcounty-il.gov

Hancock County is a county in the U.S. state of Illinois. According to the 2020 census, it has a population of 17,620. Its county seat is Carthage, and its largest city is Hamilton. The county is composed of rural towns with many farmers.

Hancock County is part of the Fort Madison-Keokuk, IA-IL-MO Micropolitan Statistical Area.