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
312-444 1 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-444 2 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-444 3 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-444 4 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-444 5 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-444 6 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-444 7 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-444 8 Chicago Zone 01-Franklin IL   5917 FIRST COMMUNICATIONS, LLC 358   2009-01-15   
312-444 9 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-445 A Chicago Zone 01-Superior IL CHCGILSUDS2  9329 AMERITECH ILLINOIS 358      
312-445 0 Chicago Zone 01-Superior IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2007-10-09   
312-445 1 Chicago Zone 01-Superior IL   5562 METRO PCS, INC. 358   2016-02-15   
312-445 2 Chicago Zone 01-Superior IL   7056 XO ILLINOIS, INC. 358   2008-04-17   
312-445 3 Chicago Zone 01-Superior IL   7056 XO ILLINOIS, INC. 358   2008-04-16   
312-445 4 Chicago Zone 01-Superior IL   5447 ACCESS ONE, INC. - IL 358   2008-04-17   
312-445 5 Chicago Zone 01-Superior IL   5447 ACCESS ONE, INC. - IL 358   2008-04-17   
312-445 6 Chicago Zone 01-Superior IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358   2008-05-13   
312-445 7 Chicago Zone 01-Superior IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358   2008-05-13   
312-445 8 Chicago Zone 01-Superior IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2008-05-14   
312-445 9 Chicago Zone 01-Superior IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2007-10-26   
312-446 A Chicago Zone 01-Calumet IL   6664 SPRINT SPECTRUM L.P. 358      
312-447 A Chicago Zone 01-Wabash IL CHCGILWBDS2  9329 AMERITECH ILLINOIS 358      
312-447 0 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-447 1 Chicago Zone 01-Wabash IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2011-01-14   
312-447 2 Chicago Zone 01-Wabash IL   5917 FIRST COMMUNICATIONS, LLC 358   2006-07-11   
312-447 3 Chicago Zone 01-Wabash IL   5917 FIRST COMMUNICATIONS, LLC 358   2006-07-11   
312-447 4 Chicago Zone 01-Wabash IL   6529 T-MOBILE USA, INC. 358   2013-06-11   
312-447 5 Chicago Zone 01-Wabash IL   5917 FIRST COMMUNICATIONS, LLC 358   2006-07-11   
312-447 6 Chicago Zone 01-Wabash IL   5917 FIRST COMMUNICATIONS, LLC 358   2006-07-11   
312-447 7 Chicago Zone 01-Wabash IL   5917 FIRST COMMUNICATIONS, LLC 358   2006-07-11   
312-447 8 Chicago Zone 01-Wabash IL   5917 FIRST COMMUNICATIONS, LLC 358   2008-04-03   
312-447 9 Chicago Zone 01-Wabash IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2011-09-25   
312-448 A Chicago Zone 01-Calumet IL ELGNIL32CM2  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2011-10-02   
312-448 0 Chicago Zone 01-Calumet IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2011-10-02   
312-448 1 Chicago Zone 01-Calumet IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2011-10-02   
312-448 2 Chicago Zone 01-Calumet IL   7056 XO ILLINOIS, INC. 358   2012-06-07   
312-448 3 Chicago Zone 01-Calumet IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2012-06-07   
312-448 4 Chicago Zone 01-Calumet IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2012-06-07   
312-448 5 Chicago Zone 01-Calumet IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2012-06-07   
312-448 6 Chicago Zone 01-Calumet IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-02-11   
312-448 7 Chicago Zone 01-Calumet IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-02-11   
312-448 8 Chicago Zone 01-Calumet IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-02-11   
312-448 9 Chicago Zone 01-Calumet IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2011-10-06   
312-449 A Chicago Zone 01-Wabash IL CHCGILBWCM2  9748 AMERICAN MESSAGING SERVICES, LLC 358      
312-450 A Chicago Zone 01-Wabash IL BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358      
312-450 0 Chicago Zone 01-Wabash IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2011-09-20   
312-450 1 Chicago Zone 01-Wabash IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2009-01-06   
312-450 2 Chicago Zone 01-Wabash IL   259E YMAX COMMUNICATIONS CORP. - IL 358   2009-09-04   
312-450 3 Chicago Zone 01-Wabash IL   259E YMAX COMMUNICATIONS CORP. - IL 358   2009-09-04   
312-450 4 Chicago Zone 01-Wabash IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358      

<< 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: VoiceMeUp - Corporate VoIP Services

Like this site? We accept donations via PayPal.