Union County, Illinois

Union County
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 / 37.47; -89.26
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.unioncountyil.gov

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".