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: 815 [Rate centres in NPA 815] [Dial plan for NPA 815]

NXX: 879

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
815-879 A Princeton IL PRTNILXAPS0  1015 FRONTIER NORTH, INC. - IL 368      
815-879 0 Princeton IL   1015 FRONTIER NORTH, INC. - IL 368      
815-879 1 Princeton IL   1015 FRONTIER NORTH, INC. - IL 368      
815-879 2 Princeton IL   1015 FRONTIER NORTH, INC. - IL 368      
815-879 3 Princeton IL   1015 FRONTIER NORTH, INC. - IL 368      
815-879 4 Princeton IL   1015 FRONTIER NORTH, INC. - IL 368      
815-879 5 Princeton IL   1015 FRONTIER NORTH, INC. - IL 368      
815-879 6 Princeton IL   145J TERRA NOVA TELECOM INC. 368   2025-06-12   
815-879 7 Princeton IL   1015 FRONTIER NORTH, INC. - IL 368      
815-879 8 Princeton IL   1015 FRONTIER NORTH, INC. - IL 368      
815-879 9 Princeton IL   1015 FRONTIER NORTH, INC. - IL 368      

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.