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.

NPA: 312 [Rate centres in NPA 312] [Dial plan for NPA 312]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-694 A Chicago Zone 01-Superior IL CHCGILSUDS2  9329 AMERITECH ILLINOIS 358      
312-694 0 Chicago Zone 01-Superior IL   9329 AMERITECH ILLINOIS 358      
312-694 1 Chicago Zone 01-Superior IL   9329 AMERITECH ILLINOIS 358      
312-694 2 Chicago Zone 01-Superior IL   9329 AMERITECH ILLINOIS 358      
312-694 3 Chicago Zone 01-Superior IL   6529 T-MOBILE USA, INC. 358   2011-03-16   
312-694 4 Chicago Zone 01-Superior IL   9329 AMERITECH ILLINOIS 358      
312-694 5 Chicago Zone 01-Superior IL   6529 T-MOBILE USA, INC. 358   2011-03-16   
312-694 6 Chicago Zone 01-Superior IL   9329 AMERITECH ILLINOIS 358      
312-694 7 Chicago Zone 01-Superior IL   9329 AMERITECH ILLINOIS 358      
312-694 8 Chicago Zone 01-Superior IL   9329 AMERITECH ILLINOIS 358      
312-694 9 Chicago Zone 01-Superior IL   9329 AMERITECH ILLINOIS 358      

Last updated: Tue, 31 Dec 2019 02:37:20 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.