McDonough County, Illinois
McDonough County, Illinois | |
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Flag | |
Location within the U.S. state of Illinois | |
| Coordinates: 40°28′N 90°41′W / 40.46°N 90.68°W | |
| Country | United States |
| State | Illinois |
| Founded | January 25, 1826 |
| Named after | Thomas Macdonough |
| Seat | Macomb |
| Largest city | Macomb |
| Area | |
• Total | 590 sq mi (1,500 km2) |
| • Land | 589 sq mi (1,530 km2) |
| • Water | 0.8 sq mi (2.1 km2) 0.1% |
| Population (2020) | |
• Total | 27,238 |
• Estimate (2024) | 26,662 |
| • Density | 46.2/sq mi (17.9/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional districts | 15th, 17th |
| Website | mcg |
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.