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: ARVDCOMADS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-403 A Denver CO 9636 QWEST CORPORATION 656      
303-420 A Denver CO 9636 QWEST CORPORATION 656      
303-421 A Denver CO 9636 QWEST CORPORATION 656      
303-422 A Denver CO 9636 QWEST CORPORATION 656      
303-423 A Denver CO 9636 QWEST CORPORATION 656      
303-424 A Denver CO 9636 QWEST CORPORATION 656      
303-425 A Denver CO 9636 QWEST CORPORATION 656      
303-431 A Denver CO 9636 QWEST CORPORATION 656      
303-432 A Denver CO 9636 QWEST CORPORATION 656      
303-456 A Denver CO 9636 QWEST CORPORATION 656      
303-463 A Denver CO 9636 QWEST CORPORATION 656      
303-467 A Denver CO 9636 QWEST CORPORATION 656      
303-940 A Denver CO 9636 QWEST CORPORATION 656      
720-898 A Denver CO 9636 QWEST CORPORATION 656      

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

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