Area codes in St Charles, Missouri
St Charles, Missouri uses area code 636. The main St Charles area code is 636.
Area codes serving St Charles
All Missouri area codes · Is a St Charles call a scam?
Nearby cities
- St Louis area codes
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Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of June 20, 2026. Refreshed monthly.