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.

Switch: SFLDMIMKEMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
586-301 A Warren MI 490J DISH WIRELESS, LLC 340      
734-602 A Ypsilanti MI 490J DISH WIRELESS, LLC 340      
810-303 A Algonac MI 490J DISH WIRELESS, LLC 340      
947-245 A Drayton Plains MI 490J DISH WIRELESS, LLC 340      
947-249 A Holly MI 490J DISH WIRELESS, LLC 340      
947-251 A Oxford MI 490J DISH WIRELESS, LLC 340      
947-257 A Pontiac MI 490J DISH WIRELESS, LLC 340      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.