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: 303 [Rate centres in NPA 303] [Dial plan for NPA 303]

NXX: 309

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
303-309 A Denver CO DNVTCO56AMD  8465 GLOBAL CROSSING LOCAL SERVICES, INC. - CO 656      
303-309 0 Denver CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2007-12-04   
303-309 1 Denver CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-309 2 Denver CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-309 3 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2001-07-25   
303-309 4 Denver CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-309 5 Denver CO DNVTCO56AMD  8465 GLOBAL CROSSING LOCAL SERVICES, INC. - CO 656      
303-309 6 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2003-09-13   
303-309 7 Denver CO DNVTCO56AMD  8465 GLOBAL CROSSING LOCAL SERVICES, INC. - CO 656      
303-309 8 Denver CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-309 9 Denver CO DNVTCO56AMD  8465 GLOBAL CROSSING LOCAL SERVICES, INC. - CO 656      

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.