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: 804

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
720-804 A Longmont CO   6529 T-MOBILE USA, INC. 656      
720-804 0 Longmont CO   278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2021-05-31   
720-804 1 Longmont CO   026D ONVOY, LLC - CO 656   2026-01-04   
720-804 2 Longmont CO   939H COMMIO, LLC 656   2021-08-28   
720-804 3 Longmont CO   6529 T-MOBILE USA, INC. 656   2021-05-29   
720-804 4 Longmont CO   6529 T-MOBILE USA, INC. 656   2021-05-29   
720-804 5 Longmont CO   6529 T-MOBILE USA, INC. 656   2021-05-29   
720-804 6 Longmont CO   6529 T-MOBILE USA, INC. 656   2021-05-29   
720-804 7 Longmont CO   6529 T-MOBILE USA, INC. 656   2021-05-29   
720-804 8 Longmont CO   6529 T-MOBILE USA, INC. 656   2021-05-29   
720-804 9 Longmont CO   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2021-05-23   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.