O Fallon zip code
Zip code in O Fallon, MO
The location O Fallon belongs to St. Charles County, state of Missouri. O Fallon has 4 zip codes which you can see in the following table.
O Fallon is the official name of the location so if you want to use the US Postal Service you must use that name. You can also use any of the following names: Cottleville, Dardenne Pr, Dardenne Prairie, Saint Paul, Saint Peters.
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