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
720-573 5   4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656   2014-12-01   
720-573 6   318J COMCAST IP PHONE, LLC 656   2015-03-13   
720-573 7   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2015-02-18   
720-573 8   318J COMCAST IP PHONE, LLC 656   2015-10-10   
720-573 9   318J COMCAST IP PHONE, LLC 656   2015-03-13   
720-574 A DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656      
720-574 0   078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-08-31   
720-574 1   078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-08-31   
720-574 2   078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-08-31   
720-574 3   078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-08-31   
720-574 4   078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-09-24   
720-574 5   078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-09-24   
720-574 6   078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-09-24   
720-574 7   078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-09-24   
720-574 8   078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-09-24   
720-574 9   078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-09-24   
720-575 A DNVTCOZIDS1  026D ONVOY, LLC - CO 656      
720-575 0   026D ONVOY, LLC - CO 656   2015-01-10   
720-575 1   026D ONVOY, LLC - CO 656   2015-01-10   
720-575 2   026D ONVOY, LLC - CO 656   2015-01-10   
720-575 3   026D ONVOY, LLC - CO 656   2015-01-10   
720-575 4   026D ONVOY, LLC - CO 656   2015-01-10   
720-575 5   026D ONVOY, LLC - CO 656   2015-01-10   
720-575 6   026D ONVOY, LLC - CO 656   2015-01-10   
720-575 7   026D ONVOY, LLC - CO 656   2015-01-10   
720-575 8   026D ONVOY, LLC - CO 656   2015-01-10   
720-575 9   026D ONVOY, LLC - CO 656   2015-01-10   
720-576 A AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-576 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 1   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 2   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 3   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 4   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 5   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 6   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 7   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 8   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 9   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-577 A DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-577 0   5562 METROPCS, INC. 656   2014-08-26   
720-577 1   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2014-08-24   
720-577 2   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2014-08-24   
720-577 3   078F BANDWIDTH.COM CLEC, LLC - CO 656   2015-04-14   
720-577 4   078F BANDWIDTH.COM CLEC, LLC - CO 656   2015-04-14   
720-577 5   078F BANDWIDTH.COM CLEC, LLC - CO 656   2015-04-14   
720-577 6   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2014-08-24   
720-577 7   5562 METROPCS, INC. 656   2014-08-26   
720-577 8   5562 METROPCS, INC. 656   2014-08-26   
720-577 9   5562 METROPCS, INC. 656   2014-08-26   
720-578 A DNVRCOCPDS0  9636 QWEST CORPORATION 656      
720-579 A DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-579 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-579 1   6529 T-MOBILE USA, INC. 656   2007-09-02   
720-579 2   6529 T-MOBILE USA, INC. 656   2007-11-02   
720-579 3   6529 T-MOBILE USA, INC. 656   2007-11-30   
720-579 4   6529 T-MOBILE USA, INC. 656   2009-07-17   
720-579 5   6529 T-MOBILE USA, INC. 656   2009-07-17   
720-579 6   6529 T-MOBILE USA, INC. 656   2008-01-18   
720-579 7   6529 T-MOBILE USA, INC. 656   2008-02-04   
720-579 8   6529 T-MOBILE USA, INC. 656   2008-03-09   
720-579 9   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-581 A DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-581 0   6529 T-MOBILE USA, INC. 656      
720-581 1   5562 METROPCS, INC. 656      
720-581 2   5562 METROPCS, INC. 656      
720-581 3   5562 METROPCS, INC. 656      
720-581 4   5562 METROPCS, INC. 656      
720-581 5   5562 METROPCS, INC. 656      
720-581 6   5562 METROPCS, INC. 656      
720-581 7   5562 METROPCS, INC. 656      
720-581 8   6529 T-MOBILE USA, INC. 656      
720-581 9   5562 METROPCS, INC. 656      
720-582 A AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-582 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-12-27   
720-582 1   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-12-27   
720-582 2   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-12-27   
720-582 3   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-12-27   
720-582 4   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-12-27   
720-582 5   5562 METROPCS, INC. 656   2016-09-11   
720-582 6   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-09-11   
720-582 7   5562 METROPCS, INC. 656   2016-09-11   
720-582 8   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-09-11   
720-582 9   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-09-11   
720-583 A DNVTCOZIDS1  026D ONVOY, LLC - CO 656      
720-583 0   318J COMCAST IP PHONE, LLC 656   2010-12-16   
720-583 1   318J COMCAST IP PHONE, LLC 656   2011-01-04   
720-583 2   318J COMCAST IP PHONE, LLC 656   2011-01-04   
720-583 3   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-11-30   
720-583 4   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-11-30   
720-583 5   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-11-30   
720-583 6   318J COMCAST IP PHONE, LLC 656   2011-01-04   
720-583 7   026D ONVOY, LLC - CO 656   2010-11-28   
720-583 8   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2010-12-16   
720-583 9   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2010-12-16   
720-584 A AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-584 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2014-12-05   
720-584 1   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2014-12-05   
720-584 2   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2014-12-05   
720-584 3   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-08-20   
720-584 4   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-08-20   

<< 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: LES.NET

Like this site? We accept donations via PayPal.