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: 319 [Rate centres in NPA 319] [Dial plan for NPA 319]

NXX: 240

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
319-240 A Waterloo IA CDRRIATS0MD  6266 UNITED STATES CELLULAR - IA 635      
319-240 0 Waterloo IA   6266 UNITED STATES CELLULAR - IA 635      
319-240 1 Waterloo IA   6266 UNITED STATES CELLULAR - IA 635      
319-240 2 Waterloo IA   6266 UNITED STATES CELLULAR - IA 635      
319-240 3 Waterloo IA   6266 UNITED STATES CELLULAR - IA 635      
319-240 4 Waterloo IA   6266 UNITED STATES CELLULAR - IA 635      
319-240 5 Waterloo IA   6266 UNITED STATES CELLULAR - IA 635      
319-240 6 Waterloo IA   6266 UNITED STATES CELLULAR - IA 635      
319-240 7 Waterloo IA   6266 UNITED STATES CELLULAR - IA 635      
319-240 8 Waterloo IA   6266 UNITED STATES CELLULAR - IA 635      
319-240 9 Waterloo IA   6266 UNITED STATES CELLULAR - IA 635      

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.