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: 720 [Rate centres in NPA 720] [Dial plan for NPA 720]

NXX: 929

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
720-929 A Denver CO NGLNCOMADS0  9636 QWEST CORPORATION 656      
720-929 0 Denver CO NGLNCOMADS0  9636 QWEST CORPORATION 656      
720-929 1 Denver CO NGLNCOMADS0  9636 QWEST CORPORATION 656      
720-929 2 Denver CO NGLNCOMADS0  9636 QWEST CORPORATION 656      
720-929 3 Denver CO DNVRCOCPDS0  9636 QWEST CORPORATION 656      
720-929 4 Denver CO DNVRCOCPDS0  9636 QWEST CORPORATION 656      
720-929 5 Denver CO DNVRCOCPDS0  9636 QWEST CORPORATION 656      
720-929 6 Denver CO DNVRCOCPDS0  9636 QWEST CORPORATION 656      
720-929 7 Denver CO DNVRCOCPDS0  9636 QWEST CORPORATION 656      
720-929 8 Denver CO NGLNCOMADS0  9636 QWEST CORPORATION 656      
720-929 9 Denver CO NGLNCOMADS0  9636 QWEST CORPORATION 656      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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