Area Code Search
Central time zone
Current Time in O Fallon: 11:49 PM
O Fallon Area Codes
Here is the current list of area codes in O Fallon, MO. There is currently 1 area code(s) in O Fallon. Search all the most up-to-date currently used O Fallon area codes below.
Central time zone
Current Time in O Fallon: 11:49 PM
| Area Code | State | City | Timezone |
|---|---|---|---|
| 636 | Missouri | O Fallon | Central |