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: 646

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
303-646 A Denver CO ELZBCO01DS1  9636 QWEST CORPORATION 656      
303-646 0 Denver CO ELZBCO01DS1  9636 QWEST CORPORATION 656      
303-646 1 Denver CO ELZBCO01DS1  9636 QWEST CORPORATION 656      
303-646 2 Denver CO ELZBCO01DS1  9636 QWEST CORPORATION 656      
303-646 3 Denver CO ELZBCO01DS1  9636 QWEST CORPORATION 656      
303-646 4 Denver CO ELZBCO01DS1  9636 QWEST CORPORATION 656      
303-646 5 Denver CO ELZBCO01DS1  9636 QWEST CORPORATION 656      
303-646 6 Denver CO ELZBCO01DS1  9636 QWEST CORPORATION 656      
303-646 7 Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2005-09-26   
303-646 8 Denver CO ELZBCO01DS1  9636 QWEST CORPORATION 656      
303-646 9 Denver CO ELZBCO01DS1  9636 QWEST CORPORATION 656      

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.