Local Calling Guide

Area code/prefix search

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

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-526 4 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-526 5 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-526 6 Chicago Zone 01-Canal IL   7056 XO ILLINOIS, INC. 358   2010-10-27   
312-526 7 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-526 8 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-526 9 Chicago Zone 01-Canal IL   7056 XO ILLINOIS, INC. 358   2010-10-27   
312-527 A Chicago Zone 01-Illinois Dearborn IL CHCGILIDDS0  9329 AMERITECH ILLINOIS 358      
312-528 A Chicago Zone 01-Calumet IL CHCGILCADS0  9329 AMERITECH ILLINOIS 358      
312-528 0 Chicago Zone 01-Calumet IL   9329 AMERITECH ILLINOIS 358      
312-528 1 Chicago Zone 01-Calumet IL   9329 AMERITECH ILLINOIS 358      
312-528 2 Chicago Zone 01-Calumet IL   7056 XO ILLINOIS, INC. 358   1999-11-30   
312-528 3 Chicago Zone 01-Calumet IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358   2001-02-27   
312-528 4 Chicago Zone 01-Calumet IL   9329 AMERITECH ILLINOIS 358      
312-528 5 Chicago Zone 01-Calumet IL   7607 COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL 358   2019-12-26   
312-528 6 Chicago Zone 01-Calumet IL   9329 AMERITECH ILLINOIS 358      
312-528 7 Chicago Zone 01-Calumet IL   7056 XO ILLINOIS, INC. 358   2011-01-05   
312-528 8 Chicago Zone 01-Calumet IL   9329 AMERITECH ILLINOIS 358      
312-528 9 Chicago Zone 01-Calumet IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358   2000-08-29   
312-529 A Chicago Zone 01-Franklin IL CHCGILCLDSC  7421 AT&T LOCAL 358      
312-529 0 Chicago Zone 01-Franklin IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2011-09-25   
312-529 1 Chicago Zone 01-Franklin IL   7421 AT&T LOCAL 358      
312-529 2 Chicago Zone 01-Franklin IL   7421 AT&T LOCAL 358      
312-529 3 Chicago Zone 01-Franklin IL   7421 AT&T LOCAL 358      
312-529 4 Chicago Zone 01-Franklin IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2005-05-25   
312-529 5 Chicago Zone 01-Franklin IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2005-03-31   
312-529 6 Chicago Zone 01-Franklin IL   7421 AT&T LOCAL 358      
312-529 7 Chicago Zone 01-Franklin IL   7056 XO ILLINOIS, INC. 358   2010-02-14   
312-529 8 Chicago Zone 01-Franklin IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2011-09-25   
312-529 9 Chicago Zone 01-Franklin IL   7421 AT&T LOCAL 358      
312-530 A Chicago Zone 01-Calumet IL BURGILAJCM1  6630 USA MOBILITY WIRELESS, INC. 358      
312-531 A Hinsdale IL BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358      
312-531 0 Hinsdale IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358      
312-532 A Chicago Zone 01-Calumet IL CHCGILMFCM6  6529 T-MOBILE USA, INC. 358      
312-532 0 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2008-08-09   
312-532 1 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2008-08-09   
312-532 2 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2008-08-09   
312-532 3 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2008-08-29   
312-532 4 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2008-03-14   
312-532 5 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2008-08-29   
312-532 6 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2008-08-29   
312-532 7 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2008-08-29   
312-532 8 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2008-08-29   
312-532 9 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2008-03-14   
312-533 A Chicago Zone 01-Wabash IL ELGNIL32CM2  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
312-533 0 Chicago Zone 01-Wabash IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
312-533 1 Chicago Zone 01-Wabash IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
312-533 2 Chicago Zone 01-Wabash IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2011-02-17   
312-533 3 Chicago Zone 01-Wabash IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2010-10-01   
312-533 4 Chicago Zone 01-Wabash IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2005-04-01   
312-533 5 Chicago Zone 01-Wabash IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      

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

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