Municipal
· Illinois
City of O Fallon
O'Fallon is a city in St. Clair County, Illinois, United States. The 2020 census listed the population at 32,289. The city is the second largest city in the Metro East region and Southern Illinois. It sits 5 miles (8.0 km) from Scott Air Force Base and 18 miles (29 km) from Downtown St. Louis.
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Reference data (Census of Governments 2022)
- Census ID (PID6)
- 162610
- FIPS state
- 17
- FIPS county
- 163
- FIPS place
- 55249
- Census record name
- CITY OF O FALLON
- Mailing address
- 255 S LINCOLN AVE, O FALLON 62269