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.

Switch: RLMDILAGDS4

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
224-231 A Roselle IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
224-510 A Wheeling IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
224-539 A Palatine IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
224-554 A Deerfield IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
815-887 A Harvard IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
847-847 A Lake Zurich IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.