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: 720 [Rate centres in NPA 720] [Dial plan for NPA 720]

NXX: 835

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
720-835 A Denver CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656      
720-835 0 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2016-01-22   
720-835 1 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2016-03-21   
720-835 2 Denver CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2016-07-14   
720-835 3 Denver CO DNVRCOMA24Z  557H WIDE VOICE, LLC - CO 656   2016-09-01   
720-835 4 Denver CO DNVRCOMA32Z  321J HD CARRIER LLC 656   2016-09-01   
720-835 5 Denver CO DNVRCOMA32Z  321J HD CARRIER LLC 656   2016-09-01   
720-835 6 Denver CO DNVRCOMA24Z  557H WIDE VOICE, LLC - CO 656   2016-09-01   
720-835 7 Denver CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2016-07-02   
720-835 8 Denver CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2016-03-04   
720-835 9 Denver CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-11-09   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.