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
720-377 9   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-379 A DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-379 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2022-07-18   
720-379 1   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-379 2   026D ONVOY, LLC - CO 656   2021-08-25   
720-379 3   318J COMCAST IP PHONE, LLC 656   2006-12-29   
720-379 4   318J COMCAST IP PHONE, LLC 656   2006-12-29   
720-379 5   318J COMCAST IP PHONE, LLC 656   2006-12-29   
720-379 6   318J COMCAST IP PHONE, LLC 656   2006-12-29   
720-379 7   318J COMCAST IP PHONE, LLC 656   2006-12-29   
720-379 8   318J COMCAST IP PHONE, LLC 656   2006-12-29   
720-379 9   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-380 A DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-380 0   6529 T-MOBILE USA, INC. 656   2013-03-18   
720-380 1   6529 T-MOBILE USA, INC. 656   2013-03-18   
720-380 2   6529 T-MOBILE USA, INC. 656   2013-03-18   
720-380 3   6529 T-MOBILE USA, INC. 656   2013-03-18   
720-380 4   6529 T-MOBILE USA, INC. 656   2013-03-18   
720-380 5   6529 T-MOBILE USA, INC. 656   2013-03-18   
720-380 6   6529 T-MOBILE USA, INC. 656   2013-03-18   
720-380 7   6529 T-MOBILE USA, INC. 656   2013-03-18   
720-380 8   6529 T-MOBILE USA, INC. 656   2013-03-18   
720-380 9   5562 METROPCS, INC. 656   2013-03-18   
720-381 A DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656      
720-381 0   318J COMCAST IP PHONE, LLC 656   2005-09-24   
720-381 1   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2006-11-12   
720-381 2   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2006-11-12   
720-381 3   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2006-11-12   
720-381 4   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2006-11-12   
720-381 5   829J PAETEC ITEL, LLC 656   2009-01-01   
720-381 6   318J COMCAST IP PHONE, LLC 656   2006-12-29   
720-381 7   6529 T-MOBILE USA, INC. 656   2007-04-21   
720-381 8   6529 T-MOBILE USA, INC. 656   2007-04-21   
720-381 9   6529 T-MOBILE USA, INC. 656   2007-04-21   
720-382 A DNVRCOETPS0  3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656      
720-382 0   6529 T-MOBILE USA, INC. 656   2006-09-09   
720-382 1   3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656      
720-382 2   3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656   2006-08-09   
720-382 3   6529 T-MOBILE USA, INC. 656   2006-09-12   
720-382 4   6529 T-MOBILE USA, INC. 656   2006-09-15   
720-382 5   3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656      
720-382 6   6529 T-MOBILE USA, INC. 656   2006-09-18   
720-382 7   3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656      
720-382 8   6529 T-MOBILE USA, INC. 656   2006-09-19   
720-382 9   6529 T-MOBILE USA, INC. 656   2006-09-21   
720-384 A DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-384 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-384 1   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-384 2   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-384 3   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2004-03-24   
720-384 4   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2005-12-13   
720-384 5   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2005-12-13   
720-384 6   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2005-12-13   
720-384 7   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2005-12-13   
720-384 8   6529 T-MOBILE USA, INC. 656   2006-09-21   
720-384 9   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-10-10   
720-385 A DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-385 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-385 1   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-385 2   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-385 3   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656   2005-06-07   
720-385 4   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2007-03-10   
720-385 5   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2007-03-10   
720-385 6   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2007-03-10   
720-385 7   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2007-06-03   
720-385 8   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2007-06-03   
720-385 9   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2007-07-03   
720-387 A AURSCOFWDS0  4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656      
720-387 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2012-10-29   
720-387 1   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2012-10-29   
720-387 2   4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656   2012-10-26   
720-387 3   4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656   2012-10-26   
720-387 4   4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656   2012-10-26   
720-387 5   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2012-10-29   
720-387 6   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2012-10-29   
720-387 7   318J COMCAST IP PHONE, LLC 656   2012-10-29   
720-387 8   318J COMCAST IP PHONE, LLC 656   2012-10-29   
720-387 9   6529 T-MOBILE USA, INC. 656   2012-11-06   
720-388 A AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-388 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2010-03-13   
720-388 1   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-05-30   
720-388 2   6529 T-MOBILE USA, INC. 656   2010-05-20   
720-388 3   6529 T-MOBILE USA, INC. 656   2010-05-20   
720-388 4   6529 T-MOBILE USA, INC. 656   2010-05-20   
720-388 5   6529 T-MOBILE USA, INC. 656   2010-05-20   
720-388 6   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-07-03   
720-388 7   026D ONVOY, LLC - CO 656   2010-06-05   
720-388 8   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-07-03   
720-388 9   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2010-07-02   
720-389 A DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-389 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2009-01-26   
720-389 1   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2025-08-08   
720-389 2   026D ONVOY, LLC - CO 656   2025-09-05   
720-389 3   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2009-01-26   
720-389 4   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2009-01-26   
720-389 5   318J COMCAST IP PHONE, LLC 656   2009-04-15   
720-389 6   318J COMCAST IP PHONE, LLC 656   2009-04-15   
720-389 7   318J COMCAST IP PHONE, LLC 656   2009-04-15   
720-389 8   318J COMCAST IP PHONE, LLC 656   2009-04-15   
720-389 9   318J COMCAST IP PHONE, LLC 656   2009-06-18   

<< 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: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.