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: 291

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-291 A Chicago Zone 01-Wabash IL CHCGILWBDS2  9329 ILLINOIS BELL TEL CO 358      
312-291 0 Chicago Zone 01-Wabash IL CHCGILWBDS2  9329 ILLINOIS BELL TEL CO 358      
312-291 1 Chicago Zone 01-Wabash IL CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2011-06-17   
312-291 2 Chicago Zone 01-Wabash IL CHCGILAEDS3  5917 FIRST COMMUNICATIONS, LLC 358   2010-03-01   
312-291 3 Chicago Zone 01-Wabash IL CHCGILTCDS4  7056 XO ILLINOIS, INC. 358   2005-12-12   
312-291 4 Chicago Zone 01-Wabash IL CHCGILTCDS4  7056 XO ILLINOIS, INC. 358   2005-12-12   
312-291 5 Chicago Zone 01-Wabash IL CHCGILCGDS1  7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2006-01-20   
312-291 6 Chicago Zone 01-Wabash IL BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2011-06-23   
312-291 7 Chicago Zone 01-Wabash IL CHCGIL24DS3  4604 FIRST COMMUNICATIONS, LLC - IL 358   2006-05-25   
312-291 8 Chicago Zone 01-Wabash IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2011-06-05   
312-291 9 Chicago Zone 01-Wabash IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2010-06-09   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.