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: CHCGILBEDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
773-233 A Chicago Zone 10-Beverly IL 9329 ILLINOIS BELL TEL CO 358      
773-238 A Chicago Zone 10-Beverly IL 9329 ILLINOIS BELL TEL CO 358      
773-239 A Chicago Zone 10-Beverly IL 9329 ILLINOIS BELL TEL CO 358      
773-298 A Chicago Zone 10-Beverly IL 9329 ILLINOIS BELL TEL CO 358      
773-429 A Chicago Zone 10-Beverly IL 9329 ILLINOIS BELL TEL CO 358      
773-445 A Chicago Zone 10-Beverly IL 9329 ILLINOIS BELL TEL CO 358      
773-779 A Chicago Zone 10-Beverly IL 9329 ILLINOIS BELL TEL CO 358      
773-881 A Chicago Zone 10-Beverly IL 9329 ILLINOIS BELL TEL CO 358      
773-980 A Chicago Zone 10-Beverly IL 9329 ILLINOIS BELL TEL CO 358      
773-980 2 Chicago Zone 10-Beverly IL 9329 ILLINOIS BELL TEL CO 358   2008-06-14   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.