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: 304

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
303-304 A Fort Lupton CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656      
303-304 0 Fort Lupton CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2005-01-09   
303-304 1 Fort Lupton CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2005-01-09   
303-304 2 Fort Lupton CO ENWDCO69CMD  6664 SPRINT SPECTRUM L.P. 656   2005-01-14   
303-304 3 Fort Lupton CO WMNSCOWSCM2  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2011-08-22   
303-304 4 Fort Lupton CO WMNSCOWSCM2  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2005-03-11   
303-304 5 Fort Lupton CO ENWDCO69CMD  6664 SPRINT SPECTRUM L.P. 656   2005-06-19   
303-304 6 Fort Lupton CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2005-07-11   
303-304 7 Fort Lupton CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2005-10-16   
303-304 8 Fort Lupton CO ENWDCO69CMD  6664 SPRINT SPECTRUM L.P. 656   2005-11-11   
303-304 9 Fort Lupton CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2005-12-12   

Last updated: Tue, 04 May 2021 15:04:27 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.