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: 720 [Rate centres in NPA 720] [Dial plan for NPA 720]

NXX: 390

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
720-390 A Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-390 0 Denver CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2013-11-03   
720-390 1 Denver CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2013-11-03   
720-390 2 Denver CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2013-11-03   
720-390 3 Denver CO   3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656   2013-10-21   
720-390 4 Denver CO   278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2013-09-08   
720-390 5 Denver CO   318J COMCAST IP PHONE, LLC 656   2013-10-14   
720-390 6 Denver CO   318J COMCAST IP PHONE, LLC 656   2013-10-14   
720-390 7 Denver CO   318J COMCAST IP PHONE, LLC 656   2013-10-14   
720-390 8 Denver CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2013-11-03   
720-390 9 Denver CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2013-11-03   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.