Union County, Illinois
Union County is a county in Illinois. Its county FIPS code is 17181. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 17181
- Representative coordinates
- 37.485652, -89.244639
- County type
- County
- County seat or government
- Jonesboro
- Resident population, July 2025
- 16,656
- Land area
- 1,070.733 km²
- Water area
- 22.539 km²
- State
- Illinois
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in Union 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
62902 · 62905 · 62906 · 62912 · 62920 · 62923 · 62926 · 62939 · 62952 · 62957 · 62958 · 62961 · 62998
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Union County government website ↗ is the next stop for county offices, tax, voting, jury and records information. 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.
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