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: 626 [Rate centres in NPA 626] [Dial plan for NPA 626]

NXX: 531

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
626-531 A Monrovia CA NRWLCA141MD  776C CHARTER FIBERLINK CA-CCO, LLC - CA 730      
626-531 0 Monrovia CA   981E BANDWIDTH.COM CLEC, LLC - CA 730   2014-07-18   
626-531 1 Monrovia CA   981E BANDWIDTH.COM CLEC, LLC - CA 730   2014-07-18   
626-531 2 Monrovia CA   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730   2013-05-05   
626-531 3 Monrovia CA   9262 UTILITY TELECOM GROUP, LLC - CA 730   2006-07-14   
626-531 4 Monrovia CA   6529 T-MOBILE USA, INC. 730   2014-10-15   
626-531 5 Monrovia CA   6529 T-MOBILE USA, INC. 730   2014-10-15   
626-531 6 Monrovia CA   776C CHARTER FIBERLINK CA-CCO, LLC - CA 730   2005-08-10   
626-531 7 Monrovia CA   776C CHARTER FIBERLINK CA-CCO, LLC - CA 730   2012-04-23   
626-531 8 Monrovia CA   624H ONVOY SPECTRUM, LLC 730   2021-07-21   
626-531 9 Monrovia CA   649C ONVOY, LLC - CA 730   2023-07-23   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.