{"area_code":"636","type":"geographic","status":"active","country":"US","region":"Missouri","region_code":"MO","principal_city":"St Charles","cities":["St Charles","O'Fallon","Chesterfield","Ballwin","Saint Charles","Saint Peters","Wildwood"],"timezone":"America/Chicago","timezone_label":"Central Time","current_local_time":"2026-08-04 15:53:47","ten_digit_dialing":false,"service_type":null,"overlay_codes":[],"nearby_codes":["314","557","618","730","235","573"],"summary":"Area code 636 covers St Charles and nearby cities including O'Fallon, Chesterfield, Ballwin in Missouri, in the Central Time.","carrier_summary":{"nxx_prefixes":432,"blocks":3710,"wireless_pct":31,"top_carriers":[{"name":"ONVOY, LLC - MO","blocks":629},{"name":"SOUTHWESTERN BELL","blocks":466},{"name":"NEW CINGULAR WIRELESS PCS, LLC - IL","blocks":458},{"name":"T-MOBILE USA, INC.","blocks":388},{"name":"BRIGHTSPEED OF MISSOURI, LLC","blocks":187},{"name":"CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO","blocks":181}],"per_number":"https://areacode.fyi/api/v1/carrier/{number}"},"canonical_url":"https://areacode.fyi/636","source":"North American Numbering Plan Administrator via areacode.fyi","data_date":"2026-08-02"}