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 54 55 56 57 58 59 60 61 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
303-536 8 Hudson CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2014-06-12   
303-536 9 Hudson CO HDSNCOMARS1  9636 QWEST CORPORATION 656      
303-537 A Denver CO AURRCOBUDS0  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-537 0 Denver CO AURRCOBUDS0  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-537 1 Denver CO AURRCOBUDS0  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-537 2 Denver CO AURRCOBUDS0  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-537 3 Denver CO AURRCOBUDS0  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-537 4 Denver CO DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656      
303-537 5 Denver CO DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656      
303-537 6 Denver CO AURRCOBUDS0  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-537 7 Denver CO DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656      
303-537 8 Denver CO AURRCOBUDS0  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-537 9 Denver CO AURRCOBUDS0  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
303-538 A Denver CO NGLNCOMADS0  9636 QWEST CORPORATION 656      
303-539 A Denver CO DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
303-540 A Denver CO DNVRCOMAXTZ  6630 USA MOBILITY WIRELESS, INC. 656      
303-541 A Denver CO BLDRCOMADS0  9636 QWEST CORPORATION 656      
303-542 A Denver CO DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
303-543 A Denver CO TEMACOMADS0  9636 QWEST CORPORATION 656      
303-544 A Denver CO BLDRCOMADS0  9636 QWEST CORPORATION 656      
303-545 A Denver CO BLDRCOMADS0  9636 QWEST CORPORATION 656      
303-546 A Denver CO BLDRCOMADS0  9636 QWEST CORPORATION 656      
303-547 A Denver CO DNVTCO56AMD  8465 GLOBAL CROSSING LOCAL SERVICES, INC. - CO 656      
303-547 0 Denver CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2004-12-14   
303-547 1 Denver CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-547 2 Denver CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2004-12-14   
303-547 3 Denver CO DNVTCO56AMD  8465 GLOBAL CROSSING LOCAL SERVICES, INC. - CO 656      
303-547 4 Denver CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2004-12-14   
303-547 5 Denver CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2004-12-14   
303-547 6 Denver CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2004-12-14   
303-547 7 Denver CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2004-12-14   
303-547 8 Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2005-02-18   
303-547 9 Denver CO DNVTCO56AMD  8465 GLOBAL CROSSING LOCAL SERVICES, INC. - CO 656      
303-548 A Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
303-549 A Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
303-550 A Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
303-551 A Denver CO DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
303-551 0 Denver CO DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
303-551 1 Denver CO DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
303-551 2 Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2007-10-08   
303-551 3 Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2007-10-08   
303-551 4 Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2007-10-08   
303-551 5 Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2007-10-08   
303-551 6 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2007-05-20   
303-551 7 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2007-05-20   
303-551 8 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2007-05-20   
303-551 9 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2007-05-20   
303-552 A Denver CO DNVTCO56AMD  8465 GLOBAL CROSSING LOCAL SERVICES, INC. - CO 656      
303-552 0 Denver CO DNVTCO56AMD  8465 GLOBAL CROSSING LOCAL SERVICES, INC. - CO 656      
303-552 1 Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2004-06-16   

<< 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 54 55 56 57 58 59 60 61 >>

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.