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]

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-521 0 Chicago Zone 01-Lakeshore IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-04   
312-521 1 Chicago Zone 01-Lakeshore IL   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2002-11-16   
312-521 2 Chicago Zone 01-Lakeshore IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358   2002-11-20   
312-521 3 Chicago Zone 01-Lakeshore IL   6664 SPRINT SPECTRUM L.P. 358   2004-03-01   
312-521 4 Chicago Zone 01-Lakeshore IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2009-04-08   
312-521 5 Chicago Zone 01-Lakeshore IL   5447 ACCESS ONE, INC. - IL 358   2009-02-25   
312-521 6 Chicago Zone 01-Lakeshore IL   7421 AT&T LOCAL 358      
312-521 7 Chicago Zone 01-Lakeshore IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2003-10-22   
312-521 8 Chicago Zone 01-Lakeshore IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2013-08-23   
312-521 9 Chicago Zone 01-Lakeshore IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2011-02-07   
312-522 A Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358      
312-522 0 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2014-10-24   
312-522 1 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2014-10-24   
312-522 2 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2014-10-24   
312-522 3 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2014-10-24   
312-522 4 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2014-10-24   
312-522 5 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2014-10-24   
312-522 6 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2014-10-24   
312-522 7 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2014-10-24   
312-522 8 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2014-10-24   
312-522 9 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2014-10-24   
312-523 A Chicago Zone 01-Wabash IL BRDVILBOCM1  6664 SPRINT SPECTRUM L.P. 358      
312-523 0 Chicago Zone 01-Wabash IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2005-06-24   
312-523 1 Chicago Zone 01-Wabash IL   6664 SPRINT SPECTRUM L.P. 358   2010-11-05   
312-523 2 Chicago Zone 01-Wabash IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2005-06-24   
312-523 3 Chicago Zone 01-Wabash IL   6664 SPRINT SPECTRUM L.P. 358      
312-523 4 Chicago Zone 01-Wabash IL   6664 SPRINT SPECTRUM L.P. 358      
312-523 5 Chicago Zone 01-Wabash IL   6664 SPRINT SPECTRUM L.P. 358      
312-523 6 Chicago Zone 01-Wabash IL   6664 SPRINT SPECTRUM L.P. 358      
312-523 7 Chicago Zone 01-Wabash IL   6664 SPRINT SPECTRUM L.P. 358      
312-523 8 Chicago Zone 01-Wabash IL   6664 SPRINT SPECTRUM L.P. 358      
312-523 9 Chicago Zone 01-Wabash IL   6664 SPRINT SPECTRUM L.P. 358      
312-524 A Wheeling IL SCBGILRRGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358      
312-524 0 Wheeling IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358      
312-525 A Chicago Zone 01-Wabash IL BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-525 0 Chicago Zone 01-Wabash IL   6664 SPRINT SPECTRUM L.P. 358   2004-03-19   
312-525 1 Chicago Zone 01-Wabash IL   6664 SPRINT SPECTRUM L.P. 358   2004-03-19   
312-525 2 Chicago Zone 01-Wabash IL   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-525 3 Chicago Zone 01-Wabash IL   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-525 4 Chicago Zone 01-Wabash IL   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-525 5 Chicago Zone 01-Wabash IL   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-525 6 Chicago Zone 01-Wabash IL   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-525 7 Chicago Zone 01-Wabash IL   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-525 8 Chicago Zone 01-Wabash IL   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-525 9 Chicago Zone 01-Wabash IL   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-526 A Chicago Zone 01-Canal IL CHCGILCLDS3  9329 AMERITECH ILLINOIS 358      
312-526 0 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-526 1 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-526 2 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-526 3 Chicago Zone 01-Canal IL   7607 COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL 358   2008-06-08   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 >>

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.