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USPS city
O Fallon, MO ZIP codes
4 ZIP codes that list O Fallon as a USPS primary or acceptable city. Not a Census place.
Sum of ZCTA populations for ZIP codes intersecting O Fallon. Not a Census place total. Methodology
Combined population of ZIP/ZCTAs that list this USPS city as a primary or acceptable name. This is a labeled ZIP-sum, never a Census place ACS population. Methodology
ZIP codes associated with O Fallon
| ZIP | City | County | Population | Income |
|---|---|---|---|---|
| 63366 | O Fallon | St. Charles County | 54,449 | $98,237 |
| 63367 | Lake Saint Louis | St. Charles County | 27,893 | $134,932 |
| 63368 | O Fallon | St. Charles County | 45,862 | $118,811 |
| 63376 | Saint Peters | St. Charles County | 74,876 | $94,921 |