Union County, Illinois
7 ZIP codes · 413.41 sq mi of land · FIPS 17181
| Population | 16,997 |
|---|---|
| State | Illinois |
| FIPS code | 17181 |
| Time zone | Central |
| Land area | 413.41 sq mi |
| Center (lat, long) | 37.4857, -89.2446 |
Area codes in this area
These are the area codes that most often serve Union County (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.
Cities and towns (largest first)
Alto PassAnnaCobdenDongolaJonesboroMillcreekWolf Lake
ZIP codes in Union County
Population: U.S. Census Bureau, ACS 5-year estimates, 2024.