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: ENWDCOMADS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-761 A Denver CO 9636 QWEST CORPORATION 656      
303-762 A Denver CO 9636 QWEST CORPORATION 656      
303-781 A Denver CO 9636 QWEST CORPORATION 656      
303-783 A Denver CO 9636 QWEST CORPORATION 656      
303-788 A Denver CO 9636 QWEST CORPORATION 656      
303-789 A Denver CO 9636 QWEST CORPORATION 656      
303-806 A Denver CO 9636 QWEST CORPORATION 656      
720-833 A Denver CO 9636 QWEST CORPORATION 656      
720-833 0 Denver CO 9636 QWEST CORPORATION 656      
720-833 2 Denver CO 9636 QWEST CORPORATION 656      
720-833 6 Denver CO 9636 QWEST CORPORATION 656      
720-833 9 Denver CO 9636 QWEST CORPORATION 656      
720-945 3 Denver CO 9636 QWEST CORPORATION 656      
720-945 4 Denver CO 9636 QWEST CORPORATION 656      
720-945 5 Denver CO 9636 QWEST CORPORATION 656      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.