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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Switch: GYPSCO03DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
970-273 A Basalt CO 4164 SAN ISABEL TELECOM, INC. - CO 656      
970-277 A Aspen CO 4164 SAN ISABEL TELECOM, INC. - CO 656      
970-280 A Eagle CO 4164 SAN ISABEL TELECOM, INC. - CO 656      
970-337 A Eagle CO 4164 SAN ISABEL TELECOM, INC. - CO 656      
970-754 A Vail CO 4164 SAN ISABEL TELECOM, INC. - CO 656      
970-766 A Edwards CO 4164 SAN ISABEL TELECOM, INC. - CO 656      
970-777 A Gypsum CO 4164 SAN ISABEL TELECOM, INC. - CO 656      
970-790 A Vail CO 4164 SAN ISABEL TELECOM, INC. - CO 656      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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