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: 661 [Rate centres in NPA 661] [Dial plan for NPA 661]

NXX: 521

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
661-521 A Palmdale: Palmdale DA CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730      
661-521 0 Palmdale: Palmdale DA CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2021-09-30   
661-521 1 Palmdale: Palmdale DA CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2021-09-30   
661-521 2 Palmdale: Palmdale DA CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2021-09-30   
661-521 3 Palmdale: Palmdale DA CA LSANCAJWDS9  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 730   2021-09-24   
661-521 4 Palmdale: Palmdale DA CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2021-09-12   
661-521 5 Palmdale: Palmdale DA CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2021-09-12   
661-521 6 Palmdale: Palmdale DA CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2021-09-12   
661-521 7 Palmdale: Palmdale DA CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2021-09-12   
661-521 8 Palmdale: Palmdale DA CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2021-09-12   
661-521 9 Palmdale: Palmdale DA CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2021-09-12   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.