McDonough County IL United States
| County FIPS | 17109 |
| Largest City | Macomb |
| State | Illinois |
| Latitude | 40.4562 |
| Longitude | -90.6779 |
| Population | 26,920 |
| Density | 45.7 people per square mile |
| Time Zone | America/Chicago |
Median household: $52,795
Median individual: $29,722
Mode: 86.4% White
Median house value: $106,805.0
Median: 34.9 years old
With at least college degree: 31.4%
With STEM degree: 40.1%
Never married: 40.9%
Unemployed: 7.9%
All data comes from the SimpleMaps US Counties Database, 2026.
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