O Fallon Zip Codes - Saint Charles County MO

O Fallon, MO Zip Code Map

O Fallon, MO is a city located in Saint Charles County, Missouri and has a land area of 85.50 square miles (221.44 km2). The water area for the city is 1.33 square miles or 3.44 km2. There are 2 total unique zip codes in O Fallon, Missouri. The area code(s) for O Fallon is 636.

Zip Codes for O Fallon, MO (2)
Zip Code
 City County
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63366 O Fallon Saint Charles
63368 O Fallon Saint Charles

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