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 2 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      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.