Union County | |
|---|---|
 Union County Courthouse in Jonesboro | |
 Location within the U.S. state of Illinois | |
 Illinois's location within the U.S. | |
| Coordinates: 37°28′N 89°16′W / 37.47°N 89.26°W | |
| Country |  United States |
| State |  Illinois |
| Founded | January 2, 1818 |
| Seat | Jonesboro |
| Largest city | Anna |
| Area | |
• Total | 422 sq mi (1,090 km2) |
| • Land | 413 sq mi (1,070 km2) |
| • Water | 8.7 sq mi (23 km2) 2.1% |
| Population (2020) | |
• Total | 17,244 |
| • Density | 41/sq mi (16/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | 12th |
| Website | www |
Union County is a county located in the U.S. state of Illinois. According to the 2020 United States Census, it had a population of 17,244.[1] Its county seat is Jonesboro.[2] It is located in the southern portion of Illinois known locally as "Little Egypt".
- ^ "State & County QuickFacts". US Census Bureau.
- ^ "Find a County". National Association of Counties. Archived from the original on May 3, 2015. Retrieved June 7, 2011.