McDonough County, Illinois
McDonough County is a county in Illinois. Its county FIPS code is 17109. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 17109
- Representative coordinates
- 40.455808, -90.678954
- County type
- County
- County seat or government
- Macomb
- Resident population, July 2025
- 25,916
- Land area
- 1,526.292 km²
- Water area
- 2.06 km²
- State
- Illinois
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in McDonough County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
61411 · 61416 · 61420 · 61422 · 61438 · 61440 · 61450 · 61452 · 61455 · 61459 · 61470 · 61475 · 61482 · 61484 · 62326 · 62367 · 62374
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Use the US government local-office directory ↗ to find the office responsible for your address. A county website has not been confidently matched here. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county at your current point, check its ZIP area, or find its physical time zone.