Marshall County
Also known as Marshall County, Illinois, Marshall County, IL
county in Illinois, United States
Key facts
- Country
- United States
- State
- Illinois
- Founded
- January 19, 1839
- Named after
- John Marshall
- Seat
- Lacon
- Largest city
- Henry
- Total
- 399 sq mi (1,030 km )
- Land
- 387 sq mi (1,000 km )
- Water
- 12 sq mi (31 km ) 2.9%
- Estimate 2025
- 11,473
- Density
- 30.3/sq mi (11.7/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
Article
Marshall County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 11,742. Its county seat is Lacon. Marshall County is part of the Peoria metropolitan area.
History