Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 304 [Rate centres in NPA 304] [Dial plan for NPA 304]

NXX: 600

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
304-600 A Letart WV   612K CSC VOICE, LLC 254      
304-600 0 Letart WV CHTNWVLE7MD  391E CEBRIDGE TELECOM WV, LLC DBA SUDDENLINK COMMS - WV 254      
304-600 1 Letart WV CHTNWVLEEMD  073H TELNYX LLC 254   2021-03-05   
304-600 2 Letart WV CHTNWVLEGMD  624H ONVOY SPECTRUM, LLC 254   2021-11-08   
304-600 3 Letart WV CHTNWVLEGMD  624H ONVOY SPECTRUM, LLC 254   2021-05-31   
304-600 4 Letart WV CHTNWVLEGMD  624H ONVOY SPECTRUM, LLC 254   2021-11-08   
304-600 5 Letart WV CHTNWVLEGMD  624H ONVOY SPECTRUM, LLC 254   2021-11-08   
304-600 6 Letart WV CHTNWVLEXBZ  449F ONVOY, LLC - WV 254   2018-11-05   
304-600 7 Letart WV CHTNWVLEXBZ  449F ONVOY, LLC - WV 254   2020-12-05   
304-600 8 Letart WV CHTNWVLEXBZ  449F ONVOY, LLC - WV 254   2020-12-05   
304-600 9 Letart WV CHTNWVLEGMD  624H ONVOY SPECTRUM, LLC 254   2021-11-08   

Last updated: Sat, 02 May 2026 12:20:53 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.