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St Clair County
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Cities and towns 25
- City of Belleville pop. 41,751
- City of Cahokia Heights pop. 20,466
- City of East St Louis pop. 18,195
- City of Fairview Heights pop. 16,474
- City of Lebanon pop. 4,569
- City of Mascoutah pop. 8,676
- City of O Fallon pop. 32,292
- Village of Brooklyn pop. 641
- Village of Caseyville pop. 4,389
- Village of Dupo pop. 3,941
- Village of East Carondelet pop. 384
- Village of Fairmont City pop. 2,235
- Village of Fayetteville pop. 298
- Village of Freeburg pop. 4,532
- Village of Lenzburg pop. 463
- Village of Marissa pop. 1,805
- Village of Millstadt pop. 4,028
- Village of New Athens pop. 1,925
- Village of Sauget pop. 136
- Village of Shiloh pop. 14,352
- Village of Smithton pop. 3,988
- Village of St Libory pop. 621
- Village of Summerfield pop. 339
- Village of Swansea pop. 14,210
- Village of Washington Park pop. 2,503
Townships 21
- Township of Canteen pop. 7,888
- Township of Caseyville pop. 35,257
- Township of Centreville pop. 19,887
- Township of East St Louis pop. 18,195
- Township of Engelmann pop. 746
- Township of Fayetteville pop. 1,512
- Township of Freeburg pop. 5,011
- Township of Lebanon pop. 4,720
- Township of Lenzburg pop. 942
- Township of Marissa pop. 2,236
- Township of Mascoutah pop. 9,339
- Township of Millstadt pop. 6,675
- Township of New Athens pop. 2,497
- Township of O Fallon pop. 26,336
- Township of Prairie Du Long pop. 2,632
- Township of Shiloh Valley pop. 12,861
- Township of Smithton pop. 4,135
- Township of St Clair pop. 35,552
- Township of Stites pop. 642
- Township of Stookey pop. 9,123
- Township of Sugar Loaf pop. 6,859
Reference data (Census of Governments 2022)
- Census ID (PID6)
- 162161
- FIPS state
- 17
- FIPS county
- 163
- FIPS place
- 99163
- Census record name
- COUNTY OF ST CLAIR
- Mailing address
- 10 PUBLIC SQ, BELLEVILLE 62220