Union County, Illinois

Union County profile, demographic data, and geographic information.

Local Government & Public Administration

Authoritative general-purpose local government units serving this area U.S. Census Bureau GUS (2026) / GMAF

Government Unit	Unit Type	Jurisdiction Role	Contact / Address
COUNTY OF UNION GUS Population: 16,886 (2024) ID: 162165	County	Official County Government	Contact: UNION COUNTY TREASURER 309 W MARKET ST, RM 123, JONESBORO IL 62952
CITY OF ANNA GUS Population: 4,165 (2024) ID: 207865	Municipal	Municipal Government Within County	Contact: CITY CLERK 103 MARKET ST, ANNA IL 62906-1299
CITY OF JONESBORO GUS Population: 1,655 (2024) ID: 162654	Municipal	Municipal Government Within County	Contact: CITY CLERK 1101 PUBLIC SQUARE, PO DRAWER 330, JONESBORO IL 62952
VILLAGE OF COBDEN GUS Population: 1,040 (2024) ID: 204306	Municipal	Municipal Government Within County	Contact: VILLAGE CLERK PO BOX 218, COBDEN IL 62920-0218
VILLAGE OF DONGOLA GUS Population: 645 (2024) ID: 102858	Municipal	Municipal Government Within County	Contact: PRESIDENT PO BOX 404, DONGOLA IL 62926-0404
VILLAGE OF ALTO PASS GUS Population: 305 (2024) ID: 162653	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 98, ALTO PASS IL 62905-0098
VILLAGE OF MILL CREEK GUS Population: 56 (2024) ID: 162655	Municipal	Municipal Government Within County	Contact: TREASURER PO BOX 23, MILLCREEK IL 62961-0023