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: 308 [Rate centres in NPA 308] [Dial plan for NPA 308]

NXX: 259

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
308-259 A Silver Creek NE GDISNEASGMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 646      
308-259 1 Silver Creek NE   624H ONVOY SPECTRUM, LLC 646   2025-01-03   
308-259 9 Silver Creek NE   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 646   2022-11-07   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.