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: 416

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
303-416 A Denver CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-416 0 Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2006-07-18   
303-416 1 Denver CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-416 2 Denver CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-416 3 Denver CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-416 4 Denver CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-416 5 Denver CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-416 6 Denver CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-416 7 Denver CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-416 8 Denver CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-416 9 Denver CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.