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: 309 [Rate centres in NPA 309] [Dial plan for NPA 309]

NXX: 371

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
309-371 A Galesburg IL GLBGILXDEMD  6265 UNITED STATES CELLULAR - IL 977      
309-371 0 Galesburg IL   6265 UNITED STATES CELLULAR - IL 977      
309-371 1 Galesburg IL   6265 UNITED STATES CELLULAR - IL 977      
309-371 2 Galesburg IL   6265 UNITED STATES CELLULAR - IL 977      
309-371 3 Galesburg IL   6265 UNITED STATES CELLULAR - IL 977      
309-371 4 Galesburg IL   6265 UNITED STATES CELLULAR - IL 977      
309-371 5 Galesburg IL   6265 UNITED STATES CELLULAR - IL 977      
309-371 6 Galesburg IL   6265 UNITED STATES CELLULAR - IL 977      
309-371 7 Galesburg IL   6265 UNITED STATES CELLULAR - IL 977      
309-371 8 Galesburg IL   6265 UNITED STATES CELLULAR - IL 977      
309-371 9 Galesburg IL   6265 UNITED STATES CELLULAR - IL 977      

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.