{"area_code":"406","type":"geographic","status":"active","country":"US","region":"Montana","region_code":"MT","principal_city":"Billings","cities":["Billings","Missoula","Great Falls","Bozeman","Butte","Helena"],"timezone":"America/Denver","timezone_label":"Mountain Time","current_local_time":"2026-08-04 14:01:55","ten_digit_dialing":true,"service_type":null,"overlay_codes":[],"nearby_codes":["208","986","509","368","403","385"],"summary":"Area code 406 covers Billings and nearby cities including Missoula, Great Falls, Bozeman in Montana, in the Mountain Time.","carrier_summary":{"nxx_prefixes":754,"blocks":4891,"wireless_pct":32,"top_carriers":[{"name":"ONVOY, LLC - MT","blocks":905},{"name":"CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT","blocks":787},{"name":"QWEST CORPORATION","blocks":547},{"name":"NEW CINGULAR WIRELESS PCS, LLC","blocks":422},{"name":"LEVEL 3 COMMUNICATIONS, LLC - MT","blocks":220},{"name":"BANDWIDTH.COM CLEC, LLC - MT","blocks":178}],"per_number":"https://areacode.fyi/api/v1/carrier/{number}"},"canonical_url":"https://areacode.fyi/406","source":"North American Numbering Plan Administrator via areacode.fyi","data_date":"2026-08-02"}