{"area_code":"603","type":"geographic","status":"active","country":"US","region":"New Hampshire","region_code":"NH","principal_city":"Manchester","cities":["Manchester","Nashua","Derry","Dover","East Concord","Keene","Portsmouth","Rochester"],"timezone":"America/New_York","timezone_label":"Eastern Time","current_local_time":"2026-08-04 16:02:26","ten_digit_dialing":true,"service_type":null,"overlay_codes":[],"nearby_codes":["351","978","339","781","617","857"],"summary":"Area code 603 covers Manchester and nearby cities including Nashua, Derry, Dover in New Hampshire, in the Eastern Time.","carrier_summary":{"nxx_prefixes":752,"blocks":5783,"wireless_pct":39,"top_carriers":[{"name":"CONSOLIDATED COMM OF NO. NEW ENGLAND-NH","blocks":1053},{"name":"BELL ATLANTIC MOBILE, INC","blocks":921},{"name":"OMNIPOINT MIAMI E LICENSE, LLC","blocks":477},{"name":"PAETEC ITEL, LLC","blocks":468},{"name":"NEW CINGULAR WIRELESS PCS, LLC - DC","blocks":375},{"name":"COMCAST IP PHONE, LLC","blocks":324}],"per_number":"https://areacode.fyi/api/v1/carrier/{number}"},"canonical_url":"https://areacode.fyi/603","source":"North American Numbering Plan Administrator via areacode.fyi","data_date":"2026-08-02"}