St. Clair County, Illinois
St. Clair 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: 251,149 (2024)
ID: 162161
|
County | Official County Government |
Contact: AUDITOR
10 PUBLIC SQ, BELLEVILLE IL 62220-1623
|
|
GUS Population: 40,560 (2024)
ID: 125051
|
Municipal | Municipal Government Within County |
Contact: FINANCE DIRECTOR
101 S ILLINOIS ST, BELLEVILLE IL 62220-2197
|
|
GUS Population: 35,560 (2024)
ID: 125325
|
Township | Municipal Government Within County |
Contact: TOWNSHIP SUPERVISOR
107 SERVICE ST, SWANSEA IL 62226-3943
|
|
TOWNSHIP OF CASEYVILLE
GUS Population: 34,699 (2024)
ID: 163270
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
10001 BUNKUM RD, FAIRVIEW HEIGHTS IL 62208-1703
|
|
GUS Population: 32,169 (2024)
ID: 162610
|
Municipal | Municipal Government Within County |
Contact: CITY ADMINISTRATOR
255 S LINCOLN AVE, O FALLON IL 62269-2139
|
|
GUS Population: 26,666 (2024)
ID: 163276
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
801 E STATE ST, O FALLON IL 62269-1579
|
|
TOWNSHIP OF CENTREVILLE
GUS Population: 19,253 (2024)
ID: 103077
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
4831 BOND AVE, EAST SAINT LOUIS IL 62207-2595
|
|
TOWNSHIP OF EAST ST LOUIS
GUS Population: 17,808 (2024)
ID: 125323
|
Township | Municipal Government Within County |
Contact: OFFICE MGR
6755 STATE ST, EAST SAINT LOUIS IL 62203-1673
|
|
GUS Population: 17,808 (2024)
ID: 162604
|
Municipal | Municipal Government Within County |
Contact: CITY MANAGER
301 RIVERPARK DR, EAST SAINT LOUIS IL 62201-3028
|
|
GUS Population: 17,052 (2024)
ID: 250556
|
Municipal | Municipal Government Within County |
Contact: MAYOR
103 MAIN STREET, CAHOKIA IL 62206
|
|
GUS Population: 16,115 (2024)
ID: 162615
|
Municipal | Municipal Government Within County |
Contact: CITY ADMINISTRATOR
10025 BUNKUM RD, FAIRVIEW HEIGHTS IL 62208-1798
|
|
GUS Population: 14,754 (2024)
ID: 125056
|
Municipal | Municipal Government Within County |
Contact: TREASURER
1 PARK DR, SHILOH IL 62269-3648
|
|
GUS Population: 14,445 (2024)
ID: 102831
|
Municipal | Municipal Government Within County |
Contact: VILLAGE ADMINISTRATOR
1400 N ILLINOIS ST, SWANSEA IL 62226-4232
|
|
TOWNSHIP OF SHILOH VALLEY
GUS Population: 12,858 (2024)
ID: 103079
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
1370 SHILOH STATION RD, BELLEVILLE IL 62221
|
|
TOWNSHIP OF MASCOUTAH
GUS Population: 9,761 (2024)
ID: 207920
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
622 W MAIN ST, MASCOUTAH IL 62258-1157
|
|
GUS Population: 9,118 (2024)
ID: 162607
|
Municipal | Municipal Government Within County |
Contact: CITY CLERK
3 W MAIN ST, MASCOUTAH IL 62258-2044
|
|
TOWNSHIP OF STOOKEY
GUS Population: 8,859 (2024)
ID: 125326
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
313 EILER RD, BELLEVILLE IL 62223-2599
|
|
TOWNSHIP OF CANTEEN
GUS Population: 7,766 (2024)
ID: 163269
|
Township | Municipal Government Within County |
Contact: TOWNSHIP CLERK
5500 BUNKUM RD, EAST SAINT LOUIS IL 62204-2928
|
|
TOWNSHIP OF SUGAR LOAF
GUS Population: 6,643 (2024)
ID: 163279
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
240 S 5TH ST, DUPO IL 62239-1391
|
|
GUS Population: 6,528 (2024)
ID: 163275
|
Township | Municipal Government Within County |
Contact: TOWNSHIP SUPERVISOR
820 S JEFFERSON ST, MILLSTADT IL 62260-2036
|
|
TOWNSHIP OF FREEBURG
GUS Population: 4,947 (2024)
ID: 189992
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
203 S RICHLAND ST, FREEBURG IL 62243-1391
|
|
CITY OF LEBANON
GUS Population: 4,628 (2024)
ID: 102828
|
Municipal | Municipal Government Within County |
Contact: MAYOR
312 W SAINT LOUIS ST, LEBANON IL 62254-1592
|
|
GUS Population: 4,518 (2024)
ID: 194694
|
Municipal | Municipal Government Within County |
Contact: VILLAGE ADMINISTRATOR
14 SOUTHGATE CTR, FREEBURG IL 62243-1541
|
|
GUS Population: 4,395 (2024)
ID: 102826
|
Municipal | Municipal Government Within County |
Contact: VILLAGE ATTORNEY
909 S MAIN ST, CASEYVILLE IL 62232
|
|
TOWNSHIP OF LEBANON
GUS Population: 4,301 (2024)
ID: 163273
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
PO BOX 245, SUMMERFIELD IL 62289-0245
|
|
TOWNSHIP OF SMITHTON
GUS Population: 4,039 (2024)
ID: 207921
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
203 N MAIN ST, SMITHTON IL 62285-1513
|
|
GUS Population: 3,957 (2024)
ID: 102830
|
Municipal | Municipal Government Within County |
Contact: OFFICE MANAGER
111 W LAUREL ST, MILLSTADT IL 62260-1925
|
|
VILLAGE OF SMITHTON
GUS Population: 3,888 (2024)
ID: 162612
|
Municipal | Municipal Government Within County |
Contact: VILLAGE CLERK
101 S MAIN ST, SMITHTON IL 62285-1707
|
|
VILLAGE OF DUPO
GUS Population: 3,797 (2024)
ID: 125053
|
Municipal | Municipal Government Within County |
Contact: MAYIR
107 N 2ND ST, DUPO IL 62239-1202
|
|
TOWNSHIP OF PRAIRIE DU LONG
GUS Population: 2,567 (2024)
ID: 163277
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
2505 KAISER RD, NEW ATHENS IL 62264-2511
|
|
VILLAGE OF WASHINGTON PARK
GUS Population: 2,481 (2024)
ID: 125057
|
Municipal | Municipal Government Within County |
Contact: TREASURER
5218 N PARK DR, WASHINGTON PK IL 62204-2149
|
|
TOWNSHIP OF NEW ATHENS
GUS Population: 2,425 (2024)
ID: 125324
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
1314 PHILLIPS ST, NEW ATHENS IL 62264-1637
|
|
VILLAGE OF FAIRMONT CITY
GUS Population: 2,169 (2024)
ID: 162605
|
Municipal | Municipal Government Within County |
Contact: TREASURER
2568 N 41ST ST, STE C, FAIRMONT CITY IL 62201-2204
|
|
GUS Population: 2,167 (2024)
ID: 185102
|
Township | Municipal Government Within County |
Contact: SUPERVISOR OF TOWNSHIP
211 E MILL ST, MARISSA IL 62257-1500
|
|
GUS Population: 1,870 (2024)
ID: 211684
|
Municipal | Municipal Government Within County |
Contact: VILLAGE PRESIDENT
905 SPOTSYLVANIA ST, NEW ATHENS IL 62264-1569
|
|
VILLAGE OF MARISSA
GUS Population: 1,743 (2024)
ID: 162606
|
Municipal | Municipal Government Within County |
Contact: VILLAGE CLERK
212 N MAIN ST, MARISSA IL 62257-1399
|
|
TOWNSHIP OF FAYETTEVILLE
GUS Population: 1,478 (2024)
ID: 163272
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
PO BOX 99, SAINT LIBORY IL 62282
|
|
TOWNSHIP OF LENZBURG
GUS Population: 910 (2024)
ID: 163274
|
Township | Municipal Government Within County |
Contact: TWP SUPERVISOR
966 WINTER RD, MARISSA IL 62257-2218
|
|
TOWNSHIP OF ENGELMANN
GUS Population: 730 (2024)
ID: 163271
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
10440 KRUSE RD, MASCOUTAH IL 62258-3922
|
|
TOWNSHIP OF STITES
GUS Population: 624 (2024)
ID: 163278
|
Township | Municipal Government Within County |
Contact: SUPERVISOR
500 WASHINGTON ST, LOVEJOY IL 62059-6102
|
|
VILLAGE OF BROOKLYN
GUS Population: 623 (2024)
ID: 162603
|
Municipal | Municipal Government Within County |
Contact: VILLAGE CLERK
312 S 5TH ST, LOVEJOY IL 62059
|
|
GUS Population: 608 (2024)
ID: 162611
|
Municipal | Municipal Government Within County |
Contact: TREASURER
743 RUTTER ST, SAINT LIBORY IL 62282-0298
|
|
VILLAGE OF LENZBURG
GUS Population: 448 (2024)
ID: 125055
|
Municipal | Municipal Government Within County |
Contact: CLERK
PO BOX 156, LENZBURG IL 62255-0156
|
|
VILLAGE OF EAST CARONDELET
GUS Population: 373 (2024)
ID: 193206
|
Municipal | Municipal Government Within County |
Contact: GEORGIA PRUSA
PO BOX 122, 950 STATE, EAST CARONDELET IL 62240-1002
|
|
VILLAGE OF SUMMERFIELD
GUS Population: 331 (2024)
ID: 162613
|
Municipal | Municipal Government Within County |
Contact: TREASURER
PO BOX 131, SUMMERFIELD IL 62289-0131
|
|
VILLAGE OF FAYETTEVILLE
GUS Population: 286 (2024)
ID: 125054
|
Municipal | Municipal Government Within County |
Contact: VILLAGE CLERK
2212 MAIN AVE, FAYETTEVILLE IL 62258-5004
|
|
VILLAGE OF SAUGET
GUS Population: 134 (2024)
ID: 162608
|
Municipal | Municipal Government Within County |
Contact: MAYOR
2897 FALLING SPRINGS RD, SAUGET IL 62206-1123
|