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]

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
303-815 6 Denver CO   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2005-07-11   
303-815 7 Denver CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2006-04-07   
303-815 8 Denver CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2006-04-07   
303-815 9 Denver CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2006-04-07   
303-816 A Deckers CO BALYCOMADS1  9636 QWEST CORPORATION 656      
303-816 0 Deckers CO   9636 QWEST CORPORATION 656      
303-816 1 Deckers CO   9636 QWEST CORPORATION 656      
303-816 2 Deckers CO   9636 QWEST CORPORATION 656      
303-816 3 Deckers CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2012-06-30   
303-816 4 Deckers CO   9636 QWEST CORPORATION 656      
303-816 5 Deckers CO   9636 QWEST CORPORATION 656      
303-816 6 Deckers CO   9636 QWEST CORPORATION 656      
303-816 7 Deckers CO   9636 QWEST CORPORATION 656      
303-816 8 Deckers CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-07-03   
303-816 9 Deckers CO   9636 QWEST CORPORATION 656      
303-817 A Denver CO WMNSCOWSCM2  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
303-818 A Denver CO WMNSCOWSCM2  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
303-819 A Denver CO WMNSCOWSCM2  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
303-820 A Denver CO DNVRCOMADS0  9636 QWEST CORPORATION 656      
303-821 A Denver CO DNVRCOMAXTZ  6630 USA MOBILITY WIRELESS, INC. 656      
303-822 A Byers CO BYRSCOXCDS0  2181 BIJOU TELEPHONE COOPERATIVE ASSOCIATION, INC. 656      
303-823 A Allens Park-Lyons CO LYNSCOMARS1  9636 QWEST CORPORATION 656      
303-823 0 Allens Park-Lyons CO   9636 QWEST CORPORATION 656      
303-823 1 Allens Park-Lyons CO   320E YMAX COMMUNICATIONS CORP. - CO 656   2011-03-14   
303-823 2 Allens Park-Lyons CO   9636 QWEST CORPORATION 656      
303-823 3 Allens Park-Lyons CO   320E YMAX COMMUNICATIONS CORP. - CO 656   2011-03-14   
303-823 4 Allens Park-Lyons CO   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2009-09-30   
303-823 5 Allens Park-Lyons CO   9636 QWEST CORPORATION 656      
303-823 6 Allens Park-Lyons CO   9636 QWEST CORPORATION 656      
303-823 7 Allens Park-Lyons CO   9636 QWEST CORPORATION 656      
303-823 8 Allens Park-Lyons CO   9636 QWEST CORPORATION 656      
303-823 9 Allens Park-Lyons CO   9636 QWEST CORPORATION 656      
303-824 A Denver CO AURRCOBUDS0  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-824 0 Denver CO   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-824 1 Denver CO   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-824 2 Denver CO   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-824 3 Denver CO   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-824 4 Denver CO   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-824 5 Denver CO   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-824 6 Denver CO   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-824 7 Denver CO   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-824 8 Denver CO   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-824 9 Denver CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-10-30   
303-825 A Denver CO DNVRCOMADS0  9636 QWEST CORPORATION 656      
303-826 A Denver CO DNVRCOMAXTZ  6630 USA MOBILITY WIRELESS, INC. 656      
303-827 A Longmont CO DNVRCO26DS1  7801 ICG TELECOM GROUP - CO 656      
303-827 0 Longmont CO   7801 ICG TELECOM GROUP - CO 656      
303-827 1 Longmont CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2005-10-14   
303-827 2 Longmont CO   7801 ICG TELECOM GROUP - CO 656      
303-827 3 Longmont CO   320A COMCAST PHONE OF COLORADO, LLC - CO 656   2002-12-16   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 >>

Last updated: Sat, 14 Sep 2019 01:44:23 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.