O Fallon, MO ZIP codes
O Fallon, Missouri has 2 ZIP codes. They are in St. Charles County.
- Population in these ZIPs
- 101,735
- Avg. median income
- $111,600population-weighted
- Typical home value
- $387,600population-weighted
- Metro area
- St. Louis, MO-IL
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O Fallon, MO ZIP codes list
| ZIP code | County | Population | Median income | Typical home value |
|---|---|---|---|---|
| 63366 | St. Charles County | 54,769 | $100,621 | $363,600 |
| 63368 | St. Charles County | 46,966 | $124,297 | $415,600 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near O Fallon
- Lake Saint Louis 4 mi
- Saint Peters 6 mi
- Wentzville 7 mi
- Old Monroe 10 mi
- Saint Charles 10 mi
- New Melle 10 mi
- Defiance 11 mi
- Foristell 12 mi
- Chesterfield 13 mi
- Moscow Mills 13 mi
- Winfield 14 mi
- Saint Albans 15 mi
Frequently asked questions
What county is O Fallon, Missouri in?
O Fallon ZIP codes are in St. Charles County.