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: 516

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
720-516 A Denver CO LTTNCOHLDS0  9636 QWEST CORPORATION 656      
720-516 0 Denver CO LTTNCOHLDS0  9636 QWEST CORPORATION 656   2017-08-20   
720-516 1 Denver CO LTTNCOHLDS0  9636 QWEST CORPORATION 656   2017-08-20   
720-516 2 Denver CO LTTNCOHLDS0  9636 QWEST CORPORATION 656   2017-08-20   
720-516 3 Denver CO LTTNCOHLDS0  9636 QWEST CORPORATION 656   2017-08-20   
720-516 4 Denver CO LTTNCOHLDS0  9636 QWEST CORPORATION 656   2017-08-20   
720-516 5 Denver CO LTTNCOHLDS0  9636 QWEST CORPORATION 656   2017-08-20   
720-516 6 Denver CO LTTNCOHLDS0  9636 QWEST CORPORATION 656   2017-08-20   
720-516 7 Denver CO LTTNCOHLDS0  9636 QWEST CORPORATION 656   2017-08-20   
720-516 8 Denver CO LTTNCOHLDS0  9636 QWEST CORPORATION 656   2017-08-20   
720-516 9 Denver CO LTTNCOHLDS0  9636 QWEST CORPORATION 656   2017-08-20   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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