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.

Chicago Zone 01-Calumet, IL

<< 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 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
312-262 8   5562 METROPCS, INC. 358   2009-05-22   
312-262 9   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-264 A CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-265 A CHCGILDTKMD  5447 ACCESS ONE, INC. - IL 358      
312-265 0   318J COMCAST IP PHONE, LLC 358   2006-08-12   
312-265 1   318J COMCAST IP PHONE, LLC 358   2006-08-12   
312-265 2   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2006-12-09   
312-265 3   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2006-12-09   
312-265 4   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2006-05-22   
312-265 5   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2006-05-22   
312-265 6   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2006-05-22   
312-265 7   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2006-05-22   
312-265 8   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2006-05-22   
312-265 9   5447 ACCESS ONE, INC. - IL 358   2006-01-20   
312-268 A CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-268 0   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-268 1   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-268 2   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-268 3   9329 ILLINOIS BELL TEL CO 358   2000-09-28   
312-268 4   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-268 5   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-268 6   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-268 7   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-268 8   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-268 9   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-270 A ELGNILOTGT5  5562 METROPCS, INC. 358      
312-270 0   984E BANDWIDTH.COM CLEC, LLC - IL 358   2017-03-10   
312-270 1   984E BANDWIDTH.COM CLEC, LLC - IL 358   2017-03-10   
312-270 2   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2017-03-10   
312-270 3   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2017-04-07   
312-270 4   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2017-04-07   
312-270 5   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2017-04-07   
312-270 6   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2017-04-07   
312-270 7   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2017-03-10   
312-270 8   073H TELNYX LLC 358   2017-03-17   
312-270 9   5562 METROPCS, INC. 358   2017-03-09   
312-272 A LBRDILGOAMD  6630 USA MOBILITY WIRELESS, INC. 358      
312-273 A RVDLILBDAMD  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
312-273 0   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2011-11-12   
312-273 1   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2013-03-19   
312-273 2   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2012-07-22   
312-273 3   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2011-11-15   
312-273 4   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2013-03-19   
312-273 5   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2013-03-19   
312-273 6   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2011-11-15   
312-273 7   6529 T-MOBILE USA, INC. 358   2011-11-15   
312-273 8   6529 T-MOBILE USA, INC. 358   2011-11-15   
312-273 9   984E BANDWIDTH.COM CLEC, LLC - IL 358   2011-12-15   
312-275 A BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-276 A BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-277 A BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-278 A CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-278 0   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-278 1   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-278 2   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-278 3   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-278 4   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-278 5   6529 T-MOBILE USA, INC. 358   2021-09-17   
312-278 6   9329 ILLINOIS BELL TEL CO 358   2000-09-28   
312-278 7   984E BANDWIDTH.COM CLEC, LLC - IL 358   2011-09-25   
312-278 8   9329 ILLINOIS BELL TEL CO 358   2000-09-28   
312-278 9   624H ONVOY SPECTRUM, LLC 358   2022-06-16   
312-281 A   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-281 0   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-281 1   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-281 2   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-281 3   9329 ILLINOIS BELL TEL CO 358   2000-09-01   
312-281 4   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-281 5   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-281 6   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-281 7   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-281 8   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-281 9   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-283 A   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-283 0   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-283 1   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-283 2   829J PAETEC ITEL, LLC 358   2008-10-22   
312-283 3   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-283 4   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-283 5   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-283 6   732J NUSO, LLC 358   2025-06-02   
312-283 7   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-283 8   984E BANDWIDTH.COM CLEC, LLC - IL 358      
312-283 9   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2025-09-25   
312-285 A ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-285 0   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2006-12-09   
312-285 1   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2010-10-02   
312-285 2   516C AT&T CORP. 358   2005-05-09   
312-285 3   6529 T-MOBILE USA, INC. 358      
312-285 4   6529 T-MOBILE USA, INC. 358      
312-285 5   6529 T-MOBILE USA, INC. 358      
312-285 6   6529 T-MOBILE USA, INC. 358      
312-285 7   6529 T-MOBILE USA, INC. 358      
312-285 8   6529 T-MOBILE USA, INC. 358      
312-285 9   6529 T-MOBILE USA, INC. 358      
312-288 A BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-288 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-288 1   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2010-07-08   
312-288 2   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-288 3   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 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 >>

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.