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.

Denver, CO

<< 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 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
303-954 2 DNVRCOMADS0  9636 QWEST CORPORATION 656   2005-10-28   
303-954 3 DNVRCOMADS0  9636 QWEST CORPORATION 656   2005-10-28   
303-954 4 DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-954 5 DNVRCOMADS0  9636 QWEST CORPORATION 656   2005-10-28   
303-954 6 DNVRCOMADS0  9636 QWEST CORPORATION 656   2005-10-28   
303-954 7 DNVRCOMADS0  9636 QWEST CORPORATION 656   2005-10-28   
303-954 8 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2006-07-31   
303-954 9 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2006-07-31   
303-955 A   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-955 0 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2006-07-04   
303-955 1 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2006-07-04   
303-955 2 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2006-07-04   
303-955 3 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2024-12-14   
303-955 4 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2006-07-04   
303-955 5 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2006-07-04   
303-955 6 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2006-07-04   
303-955 7 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2006-07-31   
303-955 8 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2006-12-29   
303-955 9   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-957 A DNVTCO56AMD  8465 GLOBAL CROSSING LOCAL SERVICES, INC. - CO 656      
303-957 0 DNVTCO56AMD  8465 GLOBAL CROSSING LOCAL SERVICES, INC. - CO 656      
303-957 1   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-957 2   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-957 3 DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-957 4   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-957 5   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-957 6 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2006-07-18   
303-957 7 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2006-07-18   
303-957 8 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2006-07-18   
303-957 9 AURSCOFWDS0  4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656      
303-960 A DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-961 A DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-961 0 DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-961 1 DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-961 2 DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-961 3 DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-961 4 DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-961 5 DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-961 6 DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-961 7 DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-961 8 DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-961 9 DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
303-962 A DNVTCOZIDS1  026D ONVOY, LLC - CO 656      
303-962 0 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2005-09-12   
303-962 1 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2005-09-12   
303-962 2 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2005-09-12   
303-962 3 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2005-09-12   
303-962 4 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2005-09-12   
303-962 5 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2005-09-12   
303-962 6 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2005-09-12   
303-962 7 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2005-09-12   
303-962 8 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2005-09-12   
303-962 9 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2005-09-12   
303-963 A DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-963 0 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2022-07-16   
303-963 1 DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-963 2 DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-963 3 DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-963 4 DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-963 5 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2007-01-13   
303-963 6 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2007-10-22   
303-963 7 DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-963 8 DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-963 9 DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-964 A DNVRCONODS0  9636 QWEST CORPORATION 656      
303-965 A DNVRCOCPDS0  9636 QWEST CORPORATION 656      
303-966 A BLDRCOMADS0  9636 QWEST CORPORATION 656      
303-967 A DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-967 0 DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-967 1 DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-967 2 DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-967 3 DNVRCO26XLX  939H COMMIO, LLC 656   2024-03-23   
303-967 4 DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-967 5 DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-967 6 DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-967 7 DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-967 8 DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-967 9 DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-968 A DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
303-968 0 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2007-08-31   
303-968 1 DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
303-968 2 DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
303-968 3 DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
303-968 4 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2006-12-14   
303-968 5 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2006-12-21   
303-968 6 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2007-09-07   
303-968 7 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2006-12-21   
303-968 8 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2006-12-21   
303-968 9 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2007-09-07   
303-969 A DNVRCOSWDS0  9636 QWEST CORPORATION 656      
303-971 A DNVRCOCLDS0  9636 QWEST CORPORATION 656      
303-972 A DNVRCOCLDS0  9636 QWEST CORPORATION 656      
303-973 A DNVRCOCLDS0  9636 QWEST CORPORATION 656      
303-974 A   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-974 0 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2007-11-05   
303-974 1   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-974 2 DNVRCOETPS0  3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656   2006-11-30   
303-974 3 DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-974 4 DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-974 5 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2007-06-01   

<< 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 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 >>

Last updated: Fri, 25 Jul 2025 03:21:23 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.