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
312-584 6 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2019-02-18   
312-584 7 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2019-02-18   
312-584 8 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2019-02-18   
312-584 9 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2019-02-18   
312-585 A Chicago Zone 01-Calumet IL   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2013-06-07   
312-585 0 Chicago Zone 01-Calumet IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2013-08-07   
312-585 1 Chicago Zone 01-Calumet IL   5447 ACCESS ONE, INC. - IL 358   2013-06-14   
312-585 2 Chicago Zone 01-Calumet IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2013-06-23   
312-585 3 Chicago Zone 01-Calumet IL   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2013-06-07   
312-585 4 Chicago Zone 01-Calumet IL   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2013-06-07   
312-585 5 Chicago Zone 01-Calumet IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2013-06-23   
312-585 6 Chicago Zone 01-Calumet IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2013-06-23   
312-585 7 Chicago Zone 01-Calumet IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2013-06-23   
312-585 8 Chicago Zone 01-Calumet IL   2491 CBEYOND COMMUNICATIONS, LLC - IL 358   2013-07-12   
312-585 9 Chicago Zone 01-Calumet IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2013-08-01   
312-586 A Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358      
312-586 0 Chicago Zone 01-Calumet IL   5562 METRO PCS, INC. 358   2016-07-16   
312-586 1 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2016-06-03   
312-586 2 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2016-06-03   
312-586 3 Chicago Zone 01-Calumet IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2016-07-01   
312-586 4 Chicago Zone 01-Calumet IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2016-07-01   
312-586 5 Chicago Zone 01-Calumet IL   5562 METRO PCS, INC. 358   2016-07-16   
312-586 6 Chicago Zone 01-Calumet IL   5562 METRO PCS, INC. 358   2016-07-16   
312-586 7 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2016-06-12   
312-586 8 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2016-06-12   
312-586 9 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2016-06-12   
312-587 A Chicago Zone 01-Superior IL CHCGILSUDS0  9329 AMERITECH ILLINOIS 358      
312-588 A Chicago Zone 01-Wabash IL CHCGILWBDS2  9329 AMERITECH ILLINOIS 358      
312-588 0 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-588 1 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-588 2 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-588 3 Chicago Zone 01-Wabash IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2007-05-09   
312-588 4 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-588 5 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-588 6 Chicago Zone 01-Wabash IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2011-09-25   
312-588 7 Chicago Zone 01-Wabash IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2007-07-27   
312-588 8 Chicago Zone 01-Wabash IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2007-07-27   
312-588 9 Chicago Zone 01-Wabash IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2011-09-25   
312-589 A Chicago Zone 01-Canal IL CHCGILCLDS3  9329 AMERITECH ILLINOIS 358      
312-589 0 Chicago Zone 01-Canal IL   6664 SPRINT SPECTRUM L.P. 358   2011-01-05   
312-589 1 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-589 2 Chicago Zone 01-Canal IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2008-06-02   
312-589 3 Chicago Zone 01-Canal IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2008-06-02   
312-589 4 Chicago Zone 01-Canal IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2008-10-25   
312-589 5 Chicago Zone 01-Canal IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2006-03-27   
312-589 6 Chicago Zone 01-Canal IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2007-05-09   
312-589 7 Chicago Zone 01-Canal IL   7056 XO ILLINOIS, INC. 358   2011-01-05   
312-589 8 Chicago Zone 01-Canal IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2013-02-08   
312-589 9 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-590 A Chicago Zone 01-Wabash IL ELGNIL32CM2  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - 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: Execulink Telecom

Like this site? We accept donations via PayPal.