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: CHCGILCLDSC

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-529 A Chicago Zone 01-Franklin IL 7421 AT&T - LOCAL 358      
312-529 1 Chicago Zone 01-Franklin IL 7421 AT&T - LOCAL 358      
312-529 2 Chicago Zone 01-Franklin IL 7421 AT&T - LOCAL 358      
312-529 3 Chicago Zone 01-Franklin IL 7421 AT&T - LOCAL 358      
312-529 6 Chicago Zone 01-Franklin IL 7421 AT&T - LOCAL 358      
312-529 9 Chicago Zone 01-Franklin IL 7421 AT&T - LOCAL 358      
312-730 A Chicago Zone 01-Wabash IL 7421 AT&T - LOCAL 358      
312-730 1 Chicago Zone 01-Wabash IL 7421 AT&T - LOCAL 358      
312-730 9 Chicago Zone 01-Wabash IL 7421 AT&T - LOCAL 358      
708-645 5 Orland IL 7421 AT&T - LOCAL 358   2005-12-08   
708-752 7 Blue Island IL 7421 AT&T - LOCAL 358   2004-04-22   
773-413 5 Chicago Zone 05-Austin IL 7421 AT&T - LOCAL 358      
815-214 6 Kankakee IL 7421 AT&T - LOCAL 358   2003-10-20   
847-844 5 Dundee IL 7421 AT&T - LOCAL 358   2002-06-12   
847-876 2 Wheeling IL 7421 AT&T - LOCAL 358   2002-01-25   

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

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