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.

Gridley, IL

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
309-355 A BLTNILXDXPX  846F MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 366      
309-355 1 BLTNILXDXPX  846F MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 366   2019-07-12   
309-355 5   145J TERRA NOVA TELECOM INC. 366   2025-05-27   
309-747 A GRDLILXDDS0  1023 GRIDLEY TEL. CO. 366      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.