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.
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NPA: 970 [Rate centres in NPA 970] [Dial plan for NPA 970]

NXX: 850

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
970-850 A Hayden CO DNVRCO26XLX  939H COMMIO, LLC 656   2024-05-09   
970-850 0 Hayden CO DNVRCO26XLX  939H COMMIO, LLC 656   2024-05-09   
970-850 1 Hayden CO DNVRCO26XLX  939H COMMIO, LLC 656   2024-05-09   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

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