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: 303 [Rate centres in NPA 303] [Dial plan for NPA 303]

NXX: 719

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
303-719 A Deer Trail CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-719 0 Deer Trail CO   145J TERRA NOVA TELECOM INC. 656   2025-05-21   
303-719 9 Deer Trail CO   883K AHOI LLC 656   2026-04-04   

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.