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: 433

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
304-433 A Martinsburg WV MRBGWVBUDS0  9214 FRONTIER WEST VIRGINIA INC. 240      
304-433 0 Martinsburg WV MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240      
304-433 1 Martinsburg WV MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240      
304-433 2 Martinsburg WV MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240      
304-433 3 Martinsburg WV MRBGWVBUDS0  9214 FRONTIER WEST VIRGINIA INC. 240      
304-433 4 Martinsburg WV MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240      
304-433 5 Martinsburg WV MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240      
304-433 6 Martinsburg WV MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240      
304-433 7 Martinsburg WV MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240      
304-433 8 Martinsburg WV FRDRMDFRXMD  9944 LEVEL 3 COMMUNICATIONS, LLC - WV 240      
304-433 9 Martinsburg WV FRDRMDFRKMD  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 240      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.