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
312-774 A Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358      
312-774 0 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2013-10-03   
312-774 1 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2013-10-03   
312-774 2 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2013-10-03   
312-774 3 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2013-10-03   
312-774 4 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2013-10-03   
312-774 5 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2013-10-03   
312-774 6 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2013-10-03   
312-774 7 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2013-10-03   
312-774 8 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2013-10-03   
312-774 9 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2013-10-03   
312-775 A Chicago Zone 01-Canal IL CHCGILCLDS3  9329 AMERITECH ILLINOIS 358      
312-775 0 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-775 1 Chicago Zone 01-Canal IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2008-03-31   
312-775 2 Chicago Zone 01-Canal IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-04   
312-775 3 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-775 4 Chicago Zone 01-Canal IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2011-04-20   
312-775 5 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-775 6 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-775 7 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-775 8 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-775 9 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-776 A Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2019-03-31   
312-776 0 Chicago Zone 01-Calumet IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2019-05-27   
312-776 1 Chicago Zone 01-Calumet IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2019-05-27   
312-776 2 Chicago Zone 01-Calumet IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2019-05-24   
312-776 3 Chicago Zone 01-Calumet IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2019-05-24   
312-776 4 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2019-03-31   
312-776 5 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2019-03-31   
312-776 6 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2019-03-31   
312-776 7 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2019-03-31   
312-776 8 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2019-03-31   
312-776 9 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2019-03-31   
312-777 A Chicago Zone 01-Wabash IL CHCGIL24DS0  7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-777 0 Chicago Zone 01-Wabash IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-777 1 Chicago Zone 01-Wabash IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-777 2 Chicago Zone 01-Wabash IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-777 3 Chicago Zone 01-Wabash IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-777 4 Chicago Zone 01-Wabash IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-777 5 Chicago Zone 01-Wabash IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-777 6 Chicago Zone 01-Wabash IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-777 7 Chicago Zone 01-Wabash IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-777 8 Chicago Zone 01-Wabash IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-777 9 Chicago Zone 01-Wabash IL   7056 XO ILLINOIS, INC. 358   2010-10-27   
312-778 A Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358      
312-778 0 Chicago Zone 01-Calumet IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2015-06-29   
312-778 1 Chicago Zone 01-Calumet IL   5562 METRO PCS, INC. 358   2015-06-12   
312-778 2 Chicago Zone 01-Calumet IL   5562 METRO PCS, INC. 358   2015-06-12   
312-778 3 Chicago Zone 01-Calumet IL   5562 METRO PCS, INC. 358   2015-06-12   
312-778 4 Chicago Zone 01-Calumet IL   5562 METRO PCS, INC. 358   2015-06-12   

<< 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: ISP Telecom

Like this site? We accept donations via PayPal.