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: OKBRILOADS3

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
630-338 4 Geneva IL 7421 AT&T - LOCAL 358   2003-01-14   
630-657 7 Warrenville IL 7421 AT&T - LOCAL 358   2002-11-11   
630-756 8 Hinsdale IL 7421 AT&T - LOCAL 358   2005-07-04   
815-617 4 Ottawa IL 7421 AT&T - LOCAL 358      
815-710 2 Morris IL 7421 AT&T - LOCAL 358      
847-260 6 Schiller Park IL 7421 AT&T - LOCAL 358   2001-12-31   
847-579 2 Deerfield IL 7421 AT&T - LOCAL 358   2003-07-19   
847-643 5 Libertyville IL 7421 AT&T - LOCAL 358   2001-09-17   

Last updated: Sat, 21 Mar 2026 23:53:39 UTC

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