{"area_code":"423","type":"geographic","status":"active","country":"US","region":"Tennessee","region_code":"TN","principal_city":"Chattanooga","cities":["Chattanooga","Johnson City","Kingsport","Bristol","East Chattanooga","East Ridge","Morristown","South Cleveland"],"timezone":"America/New_York","timezone_label":"Eastern Time","current_local_time":"2026-08-04 17:09:05","ten_digit_dialing":true,"service_type":null,"overlay_codes":["729"],"nearby_codes":["729","865","828","821","864","770"],"summary":"Area code 423 covers Chattanooga and nearby cities including Johnson City, Kingsport, Bristol in Tennessee, in the Eastern Time.","carrier_summary":{"nxx_prefixes":758,"blocks":5822,"wireless_pct":44,"top_carriers":[{"name":"CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN","blocks":969},{"name":"ONVOY, LLC - TN","blocks":729},{"name":"NEW CINGULAR WIRELESS PCS, LLC - GA","blocks":706},{"name":"BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL","blocks":510},{"name":"BANDWIDTH.COM CLEC, LLC - TN","blocks":430},{"name":"UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN","blocks":269}],"per_number":"https://areacode.fyi/api/v1/carrier/{number}"},"canonical_url":"https://areacode.fyi/423","source":"North American Numbering Plan Administrator via areacode.fyi","data_date":"2026-08-02"}