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: CHCGILWUKMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
224-429 A Grayslake IL 939H COMMIO, LLC 358      
224-498 A Antioch IL 939H COMMIO, LLC 358      
224-547 A Evanston IL 939H COMMIO, LLC 358   2024-03-10   
224-549 A Dundee IL 939H COMMIO, LLC 358   2024-03-10   
224-553 A Elk Grove IL 939H COMMIO, LLC 358   2024-03-10   
224-557 A Palatine IL 939H COMMIO, LLC 358   2024-03-14   
331-309 A Lemont IL 939H COMMIO, LLC 358      
331-316 A Naperville IL 939H COMMIO, LLC 358   2024-03-09   
331-317 A Hinsdale IL 939H COMMIO, LLC 358   2024-03-10   
708-706 A Mokena IL 939H COMMIO, LLC 358   2024-03-09   
779-219 A Braidwood IL 939H COMMIO, LLC 358      
779-376 A Grant Park IL 939H COMMIO, LLC 358      
847-449 A Cary IL 939H COMMIO, LLC 358      
847-900 A Grayslake IL 939H COMMIO, LLC 358   2024-03-10   
872-275 A Chicago Zone 01-Calumet IL 939H COMMIO, LLC 358      
872-324 A Chicago Zone 09-South Chicago IL 939H COMMIO, LLC 358      
872-351 A Chicago Zone 01-Calumet IL 939H COMMIO, LLC 358   2024-03-10   
872-353 A Chicago Zone 06-Kedzie IL 939H COMMIO, LLC 358   2024-03-10   
872-354 A Chicago Zone 08-Portsmouth IL 939H COMMIO, LLC 358   2024-03-10   
872-365 A Chicago Zone 02-Edgewater IL 939H COMMIO, LLC 358      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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