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.

Switch: BLDRCOWNDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
720-759 A Longmont CO 777H PACOPTIC NETWORKS, LLC - CO 656      
720-787 A Denver CO 777H PACOPTIC NETWORKS, LLC - CO 656      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.