Williamson County, Illinois
Williamson 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 |
|---|---|---|---|
|
GUS Population: 67,064 (2024)
ID: 207767
|
County | Official County Government |
Contact: ADMINISTRATOR
407 N MONROE ST STE 119, MARION IL 62959-2321
|
|
GUS Population: 17,021 (2024)
ID: 194698
|
Municipal | Municipal Government Within County |
Contact: ASSISTANT TREASURER
1102 TOWER SQUARE PLZ, STE 7, MARION IL 62959-2605
|
|
CITY OF HERRIN
GUS Population: 12,253 (2024)
ID: 102875
|
Municipal | Municipal Government Within County |
Contact: ACCOUNTANT
300 N PARK AVE, HERRIN IL 62948-3199
|
|
GUS Population: 5,821 (2024)
ID: 162698
|
Municipal | Municipal Government Within County |
Contact: CITY CLERK
103 S DIVISION ST, CARTERVILLE IL 62918-1358
|
|
CITY OF JOHNSTON CITY
GUS Population: 3,309 (2024)
ID: 162702
|
Municipal | Municipal Government Within County |
Contact: TREASURER
100 W BROADWAY BLVD, JOHNSTON CITY IL 62951-1424
|
|
VILLAGE OF CAMBRIA
GUS Population: 1,793 (2024)
ID: 162697
|
Municipal | Municipal Government Within County |
Contact: CODE ENFORCEMENT OFFICER
PO BOX 218, CAMBRIA IL 62915-0218
|
|
GUS Population: 1,493 (2024)
ID: 162699
|
Municipal | Municipal Government Within County |
Contact: MAYOR
PO BOX 105, CARTERVILLE IL 62918-0105
|
|
VILLAGE OF ENERGY
GUS Population: 956 (2024)
ID: 162700
|
Municipal | Municipal Government Within County |
Contact: TREASURER
210 PERSHING ST, ENERGY IL 62933
|
|
GUS Population: 750 (2024)
ID: 125092
|
Municipal | Municipal Government Within County |
Contact: MAYOR
PO BOX 129, HURST IL 62949-0129
|
|
VILLAGE OF PITTSBURG
GUS Population: 561 (2024)
ID: 162703
|
Municipal | Municipal Government Within County |
Contact: CLERK/TREAS.
PO BOX 9, PITTSBURG IL 62974-0009
|
|
CITY OF CREAL SPRINGS
GUS Population: 498 (2024)
ID: 125091
|
Municipal | Municipal Government Within County |
Contact: MAYOR
PO BOX 417, CREAL SPRINGS IL 62922-0417
|
|
VILLAGE OF FREEMAN SPUR
GUS Population: 271 (2024)
ID: 162701
|
Municipal | Municipal Government Within County |
Contact: MAYOR
PO BOX 130, FREEMAN SPUR IL 62841-0130
|
|
VILLAGE OF BUSH
GUS Population: 237 (2024)
ID: 125090
|
Municipal | Municipal Government Within County |
Contact: TRUSTEE
406 POPLAR AVE, DE SOTO IL 62924-3554
|
|
VILLAGE OF STONEFORT
GUS Population: 219 (2024)
ID: 102880
|
Municipal | Municipal Government Within County |
Contact: PRESIDENT OF BOARD
PO BOX 208, STONEFORT IL 62987-0208
|
|
VILLAGE OF SPILLERTOWN
GUS Population: 177 (2024)
ID: 162704
|
Municipal | Municipal Government Within County |
Contact: TREASURER
102 COMMUNITY DR, MARION IL 62959-7124
|
|
VILLAGE OF COLP
GUS Population: 175 (2024)
ID: 102874
|
Municipal | Municipal Government Within County |
Contact: TREASURER
PO BOX 266, COLP IL 62921-0266
|