O'Fallon, Missouri Area Code

O'Fallon, MO Area Codes are

O'Fallon, MO is officially utilizing one area code which is area code 636.

In addition to O'Fallon, MO area code information read more about area code 636 details and Missouri area codes.

O'Fallon, MO is located in Saint Charles County and observes the Central Time Zone.
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Missouri Area Code Map