{"area_code":"857","type":"geographic","status":"active","country":"US","region":"Massachusetts","region_code":"MA","principal_city":"Boston","cities":["Boston","Cambridge","Quincy","Newton","Somerville","Everett","Chelsea","Belmont","Brookline","Milton","South Boston","Watertown"],"timezone":"America/New_York","timezone_label":"Eastern Time","current_local_time":"2026-08-04 16:53:46","ten_digit_dialing":true,"service_type":null,"overlay_codes":["617"],"nearby_codes":["617","339","781","351","978","508"],"summary":"Area code 857 covers Boston and nearby cities including Cambridge, Quincy, Newton in Massachusetts, in the Eastern Time.","carrier_summary":{"nxx_prefixes":365,"blocks":3818,"wireless_pct":50,"top_carriers":[{"name":"OMNIPOINT MIAMI E LICENSE, LLC","blocks":670},{"name":"ONVOY, LLC - MA","blocks":667},{"name":"CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA","blocks":616},{"name":"METROPCS, INC.","blocks":273},{"name":"NEW CINGULAR WIRELESS PCS, LLC - DC","blocks":200},{"name":"BANDWIDTH.COM CLEC, LLC - MA","blocks":192}],"per_number":"https://areacode.fyi/api/v1/carrier/{number}"},"canonical_url":"https://areacode.fyi/857","source":"North American Numbering Plan Administrator via areacode.fyi","data_date":"2026-08-02"}