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: 503 [Rate centres in NPA 503] [Dial plan for NPA 503]

NXX: 436

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
503-436 A Cannon Beach OR CNBHOR64DS0  9638 QWEST CORPORATION 672      
503-436 0 Cannon Beach OR CNBHOR64DS0  9638 QWEST CORPORATION 672      
503-436 1 Cannon Beach OR CNBHOR64DS0  9638 QWEST CORPORATION 672      
503-436 2 Cannon Beach OR CNBHOR64DS0  9638 QWEST CORPORATION 672      
503-436 3 Cannon Beach OR PTLDORWADS2  750E ONVOY, LLC - OR 672   2020-11-10   
503-436 4 Cannon Beach OR HMTNOR210MD  352D CHARTER FIBERLINK OR-CCVII, LLC - OR 672   2007-07-17   
503-436 5 Cannon Beach OR PTLDOR69UMD  076F BANDWIDTH.COM CLEC, LLC - OR 672   2012-01-27   
503-436 6 Cannon Beach OR PTLDORWADS2  750E ONVOY, LLC - OR 672   2012-09-26   
503-436 7 Cannon Beach OR PTLDORWADS2  750E ONVOY, LLC - OR 672   2007-08-12   
503-436 8 Cannon Beach OR CNBHOR64DS0  9638 QWEST CORPORATION 672      
503-436 9 Cannon Beach OR CNBHOR64DS0  9638 QWEST CORPORATION 672      

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.