US Area Code
636
St. Louis Suburbs · Missouri
Area code 636 serves St. Charles, O'Fallon, Jefferson County and surrounding areas in Missouri. Look up any 636 number below to check for spam, see caller ID, carrier, and line type.
Area Code Details
- State / Territory
- Missouri
- Region
- St. Louis Suburbs
- Major Cities
- St. Charles, O'Fallon, Jefferson County
- Timezone
- Central Time
- Country
- United States
- Format
- +1 (636) XXX-XXXX