McDonough County
Also known as McDonough County, Illinois, McDonough County, IL
county in Illinois, United States
Key facts
- Country
- United States
- State
- Illinois
- Founded
- January 25, 1826
- Named after
- Thomas Macdonough
- Seat
- Macomb
- Largest city
- Macomb
- Total
- 590 sq mi (1,500 km )
- Land
- 589 sq mi (1,530 km )
- Water
- 0.8 sq mi (2.1 km ) 0.1%
- Estimate 2025
- 25,916
- Density
- 46.2/sq mi (17.9/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
~8 min read
Article
McDonough County is a county in the U.S. state of Illinois. According to the 2020 census, it had a population of 27,238. Its county seat is Macomb, which is also the home of Western Illinois University.
McDonough County is part of the Macomb, IL Micropolitan Statistical Area.