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: CHCGILNEXJX

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
773-417 A Chicago Zone 05-Austin IL 318J COMCAST IP PHONE, LLC 358      
773-530 A Chicago Zone 09-South Chicago IL 318J COMCAST IP PHONE, LLC 358      
773-754 A Chicago Zone 02-Edgewater IL 318J COMCAST IP PHONE, LLC 358      
773-891 A Chicago Zone 07-Stewart IL 318J COMCAST IP PHONE, LLC 358      
773-940 A Chicago Zone 06-Kedzie IL 318J COMCAST IP PHONE, LLC 358      
779-229 A Depue IL 318J COMCAST IP PHONE, LLC 358      
779-254 A Frankfort IL 318J COMCAST IP PHONE, LLC 358      
815-250 A La Salle IL 318J COMCAST IP PHONE, LLC 358      
815-390 A Braidwood IL 318J COMCAST IP PHONE, LLC 358      
815-581 A Spring Grove IL 318J COMCAST IP PHONE, LLC 358      
815-893 A Crystal Lake IL 318J COMCAST IP PHONE, LLC 358      
847-603 A Antioch IL 318J COMCAST IP PHONE, LLC 358      
847-749 A Arlington Heights IL 318J COMCAST IP PHONE, LLC 358      
847-834 A Glenview IL 318J COMCAST IP PHONE, LLC 358      
847-873 A Arlington Heights IL 318J COMCAST IP PHONE, LLC 358      
872-206 A Chicago Zone 04-Humboldt IL 318J COMCAST IP PHONE, LLC 358      

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Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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