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: 520 [Rate centres in NPA 520] [Dial plan for NPA 520]

NXX: 645

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-645 A Douglas AZ TCSNAZXGAMD  6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 668      
520-645 0 Douglas AZ   6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 668   2013-11-14   
520-645 1 Douglas AZ   579F PEERLESS NETWORK OF ARIZONA, LLC - AZ 668   2016-03-12   
520-645 2 Douglas AZ   630E ONVOY, LLC - AZ 668   2016-04-04   
520-645 3 Douglas AZ   630E ONVOY, LLC - AZ 668   2016-04-04   
520-645 4 Douglas AZ   073H TELNYX LLC 668   2018-05-01   
520-645 5 Douglas AZ   630E ONVOY, LLC - AZ 668   2016-04-22   
520-645 6 Douglas AZ   630E ONVOY, LLC - AZ 668   2016-04-22   
520-645 7 Douglas AZ   145J TERRA NOVA TELECOM INC. 668   2024-07-31   
520-645 8 Douglas AZ   630E ONVOY, LLC - AZ 668   2014-10-16   
520-645 9 Douglas AZ   630E ONVOY, LLC - AZ 668   2014-10-16   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.