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.

Williamsfield, IL

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
309-616 A GLBGILXD5MD  593K MCC TELEPHONY LLC 977      
309-616 9 GLBGILXD5MD  593K MCC TELEPHONY LLC 977   2010-07-24   
309-639 A VCTAILXDRS0  1054 MID CENTURY TEL. COOP., INC. 977      

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.