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.

Lake Forest, IL

<< 1 2 3

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
847-615 A LKFRILLFRP0  9329 ILLINOIS BELL TEL CO 358      
847-735 A LKFRILLFRP0  9329 ILLINOIS BELL TEL CO 358      
847-739 A BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
847-739 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2000-08-31   
847-739 1   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
847-739 2   829J PAETEC ITEL, LLC 358   2000-04-01   
847-739 3   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   1999-07-21   
847-739 4   829J PAETEC ITEL, LLC 358   2000-04-01   
847-739 5   829J PAETEC ITEL, LLC 358   2005-05-05   
847-739 6   6529 T-MOBILE USA, INC. 358   2007-06-22   
847-739 7   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2010-01-22   
847-739 8   8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358   1999-06-18   
847-739 9   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
847-810 A CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
847-810 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2005-11-10   
847-810 1   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2000-12-29   
847-810 2   460K FIRST COMMUNICATIONS, LLC 358   2009-03-07   
847-810 3   9329 ILLINOIS BELL TEL CO 358   2000-08-11   
847-810 4   9329 ILLINOIS BELL TEL CO 358   2000-08-11   
847-810 5   9329 ILLINOIS BELL TEL CO 358   2000-08-11   
847-810 6   9329 ILLINOIS BELL TEL CO 358   2000-08-11   
847-810 7   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
847-810 8   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2012-05-17   
847-810 9   6529 T-MOBILE USA, INC. 358   2006-12-06   

<< 1 2 3

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.