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

NXX: 603

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
970-603 A Basalt CO DNVRCO26XLX  939H COMMIO, LLC 656      
970-603 0 Basalt CO DNVRCO26XLX  939H COMMIO, LLC 656   2023-10-14   
970-603 1 Basalt CO DNVRCO26XLX  939H COMMIO, LLC 656   2023-10-14   
970-603 2 Basalt CO DNVRCO26XLX  939H COMMIO, LLC 656   2023-10-14   
970-603 3 Basalt CO DNVRCO26XLX  939H COMMIO, LLC 656   2023-10-14   
970-603 4 Basalt CO DNVRCO26XLX  939H COMMIO, LLC 656   2023-10-14   
970-603 8 Basalt CO FTCLCOMAAMD  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656   2025-01-03   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.