{"area_code":"840","type":"geographic","status":"active","country":"US","region":"California","region_code":"CA","principal_city":"Pomona","cities":["Pomona","San Bernardino","Fontana","Rancho Cucamonga","Ontario","Rialto","Chino","Chino Hills","Upland","Redlands","Diamond Bar","Highland","Colton","Yucaipa","Montclair","Claremont","La Verne","San Dimas"],"timezone":"America/Los_Angeles","timezone_label":"Pacific Time","current_local_time":"2026-08-04 13:02:00","ten_digit_dialing":true,"service_type":null,"overlay_codes":["909"],"nearby_codes":["909","951","626","657","714","562"],"summary":"Area code 840 covers Pomona and nearby cities including San Bernardino, Fontana, Rancho Cucamonga in California, in the Pacific Time.","carrier_summary":{"nxx_prefixes":121,"blocks":1258,"wireless_pct":63,"top_carriers":[{"name":"T-MOBILE USA, INC.","blocks":286},{"name":"NEW CINGULAR WIRELESS PCS, LLC","blocks":264},{"name":"ONVOY, LLC - CA","blocks":229},{"name":"CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA","blocks":191},{"name":"COMMIO, LLC","blocks":65},{"name":"FRACTEL, LLC","blocks":59}],"per_number":"https://areacode.fyi/api/v1/carrier/{number}"},"canonical_url":"https://areacode.fyi/840","source":"North American Numbering Plan Administrator via areacode.fyi","data_date":"2026-08-02"}