O Fallon, IL zip code
O Fallon, Illinois uses one zip code: 62269. Most of it is in St. Clair County. Together these zip codes are home to about 36K people.
Zip codes
1
Population
36K
All zips combined
Largest zip
62269
35,923 residents
Zip codes in O Fallon
| Zip | Type | Population | IncomeMedian income |
|---|---|---|---|
| 62269 | 35,923 | $103,818 |