File:Union_County_Courthouse_in_Jonesboro.jpg · Wikimedia Commons · See Wikimedia Commons
Union County
Also known as Union County, Illinois, Union County, IL
county in Illinois, United States
Key facts
- Country
- United States
- State
- Illinois
- Founded
- January 2, 1818
- Seat
- Jonesboro
- Largest city
- Anna
- Total
- 422 sq mi (1,090 km )
- Land
- 413 sq mi (1,070 km )
- Water
- 8.7 sq mi (23 km ) 2.1%
- Estimate 2025
- 16,656
- Density
- 41.8/sq mi (16.1/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
- Congressional district
- 12th
~6 min read
Article
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. Its county seat is Jonesboro. It is located in the southern portion of Illinois known locally as "Little Egypt".
History
Gallery (4)
On the map
2 mapped locations