O Fallon Area Code - Illinois, Saint Clair, IL
| City | O Fallon |
| State | Illinois |
| Zip Code | 62269 |
| Area Code | 618 |
| County | Saint Clair |
| State Code | IL |
| Time Zone | CST |
| Longitude | -89.9093 |
| Latitude | 38.59052 |
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