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: DNVRCOMA36Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
720-703 A Denver CO 478J NUSO, LLC 656      
720-703 1 Denver CO 478J NUSO, LLC 656   2020-08-20   
720-796 A Georgetown CO 478J NUSO, LLC 656      
720-796 1 Georgetown CO 478J NUSO, LLC 656   2021-02-08   

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

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