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: CHCGILCLGMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-395 A Chicago Zone 01-Franklin IL 7421 AT&T LOCAL 358      
312-479 A Chicago Zone 01-Canal IL 7421 AT&T LOCAL 358      
312-521 A Chicago Zone 01-Lakeshore IL 7421 AT&T LOCAL 358      
312-768 A Chicago Zone 01-Canal IL 7421 AT&T LOCAL 358      
630-210 A Naperville IL 7421 AT&T LOCAL 358      
630-429 A Aurora IL 7421 AT&T LOCAL 358      
773-269 A Chicago Zone 04-Humboldt IL 7421 AT&T LOCAL 358      
773-306 A Chicago Zone 08-Prospect IL 7421 AT&T LOCAL 358      
773-329 A Chicago Zone 03-Newcastle IL 7421 AT&T LOCAL 358      
773-409 A Chicago Zone 02-Irving IL 7421 AT&T LOCAL 358      
773-413 A Chicago Zone 05-Austin IL 7421 AT&T LOCAL 358      
773-823 A Chicago Zone 06-Lafayette IL 7421 AT&T LOCAL 358      
847-232 A Park Ridge IL 7421 AT&T LOCAL 358      
847-321 A Des Plaines IL 7421 AT&T LOCAL 358      
847-377 A North Chicago IL 7421 AT&T LOCAL 358      
847-418 A Northbrook IL 7421 AT&T LOCAL 358      
847-457 A Lake Forest IL 7421 AT&T LOCAL 358      
847-495 A Wheeling IL 7421 AT&T LOCAL 358      
847-932 A Libertyville IL 7421 AT&T LOCAL 358      
847-943 A Deerfield IL 7421 AT&T LOCAL 358      
847-972 A Chicago Zone 03-Newcastle IL 7421 AT&T LOCAL 358      

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

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