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
312-234 8 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-234 9 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-235 A Chicago Zone 01-Wabash IL CHCGILWBDS2  9329 AMERITECH ILLINOIS 358      
312-235 0 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-235 1 Chicago Zone 01-Wabash IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2008-04-11   
312-235 2 Chicago Zone 01-Wabash IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2005-12-08   
312-235 3 Chicago Zone 01-Wabash IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2005-11-08   
312-235 4 Chicago Zone 01-Wabash IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2005-11-27   
312-235 5 Chicago Zone 01-Wabash IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2005-11-27   
312-235 6 Chicago Zone 01-Wabash IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2005-12-08   
312-235 7 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-235 8 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-235 9 Chicago Zone 01-Wabash IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2010-08-16   
312-236 A Chicago Zone 01-Franklin IL CHCGILFRDS4  9329 AMERITECH ILLINOIS 358      
312-237 A Chicago Zone 01-Wabash IL HCHLILMTCM2  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
312-237 0 Chicago Zone 01-Wabash IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
312-237 1 Chicago Zone 01-Wabash IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
312-237 2 Chicago Zone 01-Wabash IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358   2003-01-05   
312-237 3 Chicago Zone 01-Wabash IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2008-07-02   
312-237 4 Chicago Zone 01-Wabash IL   5917 FIRST COMMUNICATIONS, LLC 358   2010-06-06   
312-237 5 Chicago Zone 01-Wabash IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
312-237 6 Chicago Zone 01-Wabash IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
312-237 7 Chicago Zone 01-Wabash IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
312-237 8 Chicago Zone 01-Wabash IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
312-237 9 Chicago Zone 01-Wabash IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
312-238 A Chicago Zone 01-Superior IL EKGVILAADS0  7721 BROADWING COMMUNICATIONS, LLC - IL 358      
312-238 0 Chicago Zone 01-Superior IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358      
312-238 1 Chicago Zone 01-Superior IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358      
312-238 2 Chicago Zone 01-Superior IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358      
312-238 3 Chicago Zone 01-Superior IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358      
312-238 4 Chicago Zone 01-Superior IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-238 5 Chicago Zone 01-Superior IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-238 6 Chicago Zone 01-Superior IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358      
312-238 7 Chicago Zone 01-Superior IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358      
312-238 8 Chicago Zone 01-Superior IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358      
312-238 9 Chicago Zone 01-Superior IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358      
312-239 A Chicago Zone 01-Canal IL CHCGILCLDS9  7421 AT&T LOCAL 358      
312-239 0 Chicago Zone 01-Canal IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2004-11-08   
312-239 1 Chicago Zone 01-Canal IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2006-10-23   
312-239 2 Chicago Zone 01-Canal IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2004-03-09   
312-239 3 Chicago Zone 01-Canal IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2010-06-14   
312-239 4 Chicago Zone 01-Canal IL   7421 AT&T LOCAL 358      
312-239 5 Chicago Zone 01-Canal IL   7421 AT&T LOCAL 358      
312-239 6 Chicago Zone 01-Canal IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2006-10-22   
312-239 7 Chicago Zone 01-Canal IL   7056 XO ILLINOIS, INC. 358   2005-12-12   
312-239 8 Chicago Zone 01-Canal IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2006-10-22   
312-239 9 Chicago Zone 01-Canal IL   7421 AT&T LOCAL 358      
312-240 A Chicago Zone 01-Lakeshore IL CHCGILLRDS0  9329 AMERITECH ILLINOIS 358      
312-241 A Chicago Zone 01-Calumet IL BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2011-10-14   
312-241 0 Chicago Zone 01-Calumet IL   6529 T-MOBILE USA, INC. 358   2011-10-17   

<< 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: Sun, 10 Nov 2019 13:49:34 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.