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
720-543 1   278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2016-12-05   
720-543 2   278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2016-12-05   
720-543 3   278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2016-12-05   
720-543 4   278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2016-12-05   
720-543 5   278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2016-12-05   
720-543 6   278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2016-12-05   
720-543 7   278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2016-12-05   
720-543 8   278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2016-12-05   
720-543 9   278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2016-12-05   
720-544 A LKWDCOMADS0  9636 QWEST CORPORATION 656      
720-544 0   9636 QWEST CORPORATION 656      
720-544 1   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-05-18   
720-544 2   9636 QWEST CORPORATION 656      
720-544 3   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2009-08-24   
720-544 4   9636 QWEST CORPORATION 656      
720-544 5   9636 QWEST CORPORATION 656      
720-544 6   829J PAETEC ITEL, LLC 656   2007-11-16   
720-544 7   026D ONVOY, LLC - CO 656   2008-04-11   
720-544 8   9636 QWEST CORPORATION 656      
720-544 9   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-10-10   
720-545 A DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-545 0   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2009-07-27   
720-545 1   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2009-07-27   
720-545 2   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2009-07-27   
720-545 3   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2009-08-25   
720-545 4   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2009-09-12   
720-545 5   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2009-09-14   
720-545 6   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2009-09-14   
720-545 7   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2009-09-14   
720-545 8   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2009-09-14   
720-545 9   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2009-09-04   
720-546 A DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-546 0   5562 METROPCS, INC. 656   2017-06-19   
720-546 1   6529 T-MOBILE USA, INC. 656   2016-12-08   
720-546 2   6529 T-MOBILE USA, INC. 656   2016-10-20   
720-546 3   6529 T-MOBILE USA, INC. 656   2016-10-20   
720-546 4   6529 T-MOBILE USA, INC. 656   2016-10-20   
720-546 5   6529 T-MOBILE USA, INC. 656   2016-10-20   
720-546 6   6529 T-MOBILE USA, INC. 656   2016-10-20   
720-546 7   6529 T-MOBILE USA, INC. 656   2016-10-20   
720-546 8   6529 T-MOBILE USA, INC. 656   2016-10-20   
720-546 9   6529 T-MOBILE USA, INC. 656   2016-10-20   
720-548 A   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-548 0   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-05-18   
720-548 1   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-548 2   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-548 3   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-548 4   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-548 5   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-548 6   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-548 7   6529 T-MOBILE USA, INC. 656   2007-10-12   
720-548 8   6529 T-MOBILE USA, INC. 656   2007-10-12   
720-548 9   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-549 A DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-549 0   078F BANDWIDTH.COM CLEC, LLC - CO 656   2011-04-29   
720-549 1   5562 METROPCS, INC. 656   2013-11-11   
720-549 2   026D ONVOY, LLC - CO 656   2012-12-14   
720-549 3   026D ONVOY, LLC - CO 656   2012-12-14   
720-549 4   026D ONVOY, LLC - CO 656   2012-12-14   
720-549 5   026D ONVOY, LLC - CO 656   2012-12-14   
720-549 6   026D ONVOY, LLC - CO 656   2012-12-14   
720-549 7   026D ONVOY, LLC - CO 656   2011-09-05   
720-549 8   026D ONVOY, LLC - CO 656   2011-09-05   
720-549 9   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2010-12-10   
720-550 A DNVTCOUZ0MD  829J PAETEC ITEL, LLC 656      
720-550 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2013-08-27   
720-550 1   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2013-08-27   
720-550 2   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2013-08-27   
720-550 3   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2013-08-27   
720-550 4   829J PAETEC ITEL, LLC 656   2013-08-25   
720-550 5   829J PAETEC ITEL, LLC 656   2013-08-25   
720-550 6   318J COMCAST IP PHONE, LLC 656   2013-08-27   
720-550 7   318J COMCAST IP PHONE, LLC 656   2013-08-27   
720-550 8   318J COMCAST IP PHONE, LLC 656   2013-08-27   
720-550 9   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2013-08-27   
720-551 A DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656      
720-551 0   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2011-05-30   
720-551 1   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2011-05-30   
720-551 2   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2011-05-30   
720-551 3   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2011-05-30   
720-551 4   078F BANDWIDTH.COM CLEC, LLC - CO 656   2011-06-01   
720-551 5   078F BANDWIDTH.COM CLEC, LLC - CO 656   2011-06-01   
720-551 6   078F BANDWIDTH.COM CLEC, LLC - CO 656   2011-06-01   
720-551 7   078F BANDWIDTH.COM CLEC, LLC - CO 656   2011-06-01   
720-551 8   078F BANDWIDTH.COM CLEC, LLC - CO 656   2011-06-01   
720-551 9   078F BANDWIDTH.COM CLEC, LLC - CO 656   2011-06-01   
720-553 A AURRCOMADS0  9636 QWEST CORPORATION 656      
720-553 0   9636 QWEST CORPORATION 656   2012-07-22   
720-553 1   9636 QWEST CORPORATION 656   2012-07-22   
720-553 2   9636 QWEST CORPORATION 656   2012-07-22   
720-553 3   9636 QWEST CORPORATION 656   2012-07-22   
720-553 4   9636 QWEST CORPORATION 656   2012-07-22   
720-553 5   9636 QWEST CORPORATION 656   2012-07-22   
720-553 6   9636 QWEST CORPORATION 656   2012-07-22   
720-553 7   9636 QWEST CORPORATION 656   2012-07-22   
720-553 8   9636 QWEST CORPORATION 656   2012-07-22   
720-553 9   9636 QWEST CORPORATION 656   2012-07-22   
720-554 A DNVRCODCDS0  9636 QWEST CORPORATION 656      
720-556 A AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-556 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2011-06-24   

<< 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: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.