Hancock County
Also known as Hancock County, Illinois, Hancock County, IL
county in Illinois, United States
Key facts
- Country
- United States
- State
- Illinois
- Named after
- John Hancock
- Seat
- Carthage
- Largest city
- Hamilton
- Total
- 814 sq mi (2,110 km )
- Land
- 794 sq mi (2,060 km )
- Water
- 21 sq mi (54 km ) 2.5%
- Estimate 2025
- 16,803
- Density
- 22.2/sq mi (8.57/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
- Congressional district
- 15th
Article
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.