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: 815

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
309-815 A Stanford IL BLTNILXDXMX  224C ONVOY, LLC 366      
309-815 2 Stanford IL   224C ONVOY, LLC 366   2023-08-26   
309-815 5 Stanford IL   197D VONAGE AMERICA LLC 366   2024-05-30   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.