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: ENWDCOABDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-397 A Denver CO 9636 QWEST CORPORATION 656      
303-643 A Denver CO 9636 QWEST CORPORATION 656      
303-645 A Denver CO 9636 QWEST CORPORATION 656      
303-649 A Denver CO 9636 QWEST CORPORATION 656      
303-662 A Denver CO 9636 QWEST CORPORATION 656      
303-705 A Denver CO 9636 QWEST CORPORATION 656      
303-706 A Denver CO 9636 QWEST CORPORATION 656      
303-708 A Denver CO 9636 QWEST CORPORATION 656      
303-754 A Denver CO 9636 QWEST CORPORATION 656      
303-768 A Denver CO 9636 QWEST CORPORATION 656      
303-784 A Denver CO 9636 QWEST CORPORATION 656      
303-790 A Denver CO 9636 QWEST CORPORATION 656      
303-792 A Denver CO 9636 QWEST CORPORATION 656      
303-799 A Denver CO 9636 QWEST CORPORATION 656      
303-858 A Denver CO 9636 QWEST CORPORATION 656      
303-925 A Denver CO 9636 QWEST CORPORATION 656      
720-267 A Denver CO 9636 QWEST CORPORATION 656      
720-268 A Denver CO 9636 QWEST CORPORATION 656      
720-568 A Denver CO 9636 QWEST CORPORATION 656      
720-852 A Denver CO 9636 QWEST CORPORATION 656      
720-873 A Denver CO 9636 QWEST CORPORATION 656      
720-874 A Denver CO 9636 QWEST CORPORATION 656      
720-875 A Denver CO 9636 QWEST CORPORATION 656      
720-895 A Denver CO 9636 QWEST CORPORATION 656      

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

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