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: 438

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
503-438 A St Helens OR TGRDORAODS0  7531 TELEPORT COMMUNICATIONS AMERICA, LLC - OR 672      
503-438 0 St Helens OR PTLJORIY0MD  6529 T-MOBILE USA, INC. 672   2003-06-18   
503-438 1 St Helens OR PTLEORXMAMD  7537 LEVEL 3 TELECOM OF OREGON, LLC - OR 672   2003-07-12   
503-438 2 St Helens OR TGRDORAODS0  7531 TELEPORT COMMUNICATIONS AMERICA, LLC - OR 672      
503-438 3 St Helens OR PTLDOR69X9X  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 672   2006-12-22   
503-438 4 St Helens OR PTLGORIA7MD  3234 LEVEL 3 COMMUNICATIONS, LLC - OR 672   2004-07-03   
503-438 5 St Helens OR PTLJORIY0MD  6529 T-MOBILE USA, INC. 672   2004-11-13   
503-438 6 St Helens OR PTLJORIY0MD  6529 T-MOBILE USA, INC. 672   2008-01-20   
503-438 7 St Helens OR PTLDORWADS2  750E ONVOY, LLC - OR 672   2006-10-14   
503-438 8 St Helens OR PTLDOR62GT2  6010 NEW CINGULAR WIRELESS PCS, LLC 672   2008-11-21   
503-438 9 St Helens OR PTLDOR62GT2  6010 NEW CINGULAR WIRELESS PCS, LLC 672   2011-09-23   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.