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: 704

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
970-704 A Carbondale CO CRDLCOMADS1  9636 QWEST CORPORATION 656      
970-704 0 Carbondale CO   9636 QWEST CORPORATION 656      
970-704 1 Carbondale CO   9636 QWEST CORPORATION 656      
970-704 2 Carbondale CO   9636 QWEST CORPORATION 656      
970-704 3 Carbondale CO   9636 QWEST CORPORATION 656      
970-704 4 Carbondale CO   9636 QWEST CORPORATION 656      
970-704 5 Carbondale CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2004-11-11   
970-704 6 Carbondale CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2006-01-06   
970-704 8 Carbondale CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2006-04-02   
970-704 9 Carbondale CO   9636 QWEST CORPORATION 656      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.