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.

Switch: KIOWCONMRS3

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-621 A Denver CO 9636 QWEST CORPORATION 656      
303-621 0 Denver CO 9636 QWEST CORPORATION 656      
303-621 1 Denver CO 9636 QWEST CORPORATION 656      
303-621 2 Denver CO 9636 QWEST CORPORATION 656      
303-621 3 Denver CO 9636 QWEST CORPORATION 656      
303-621 7 Denver CO 9636 QWEST CORPORATION 656      
303-621 8 Denver CO 9636 QWEST CORPORATION 656      
303-621 9 Denver CO 9636 QWEST CORPORATION 656      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.