{"area_code":"557","type":"geographic","status":"active","country":"US","region":"Missouri","region_code":"MO","principal_city":"St Louis","cities":["St Louis","St. Louis","Florissant","Affton","Ferguson","Hazelwood","Kirkwood","Maryland Heights","Mehlville","Oakville","Spanish Lake","University City","Webster Groves"],"timezone":"America/Chicago","timezone_label":"Central Time","current_local_time":"2026-08-04 15:01:19","ten_digit_dialing":true,"service_type":null,"overlay_codes":["314"],"nearby_codes":["314","636","618","730","235","573"],"summary":"Area code 557 covers St Louis and nearby cities including St. Louis, Florissant, Affton in Missouri, in the Central Time.","carrier_summary":{"nxx_prefixes":73,"blocks":749,"wireless_pct":43,"top_carriers":[{"name":"NEW CINGULAR WIRELESS PCS, LLC - IL","blocks":230},{"name":"ONVOY, LLC - MO","blocks":214},{"name":"TELEPORT COMMUNICATIONS AMERICA, LLC - MO","blocks":157},{"name":"CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO","blocks":44},{"name":"ONVOY SPECTRUM, LLC","blocks":25},{"name":"BOOST SUBSCRIBERCO L.L.C.","blocks":17}],"per_number":"https://areacode.fyi/api/v1/carrier/{number}"},"canonical_url":"https://areacode.fyi/557","source":"North American Numbering Plan Administrator via areacode.fyi","data_date":"2026-08-02"}