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: SFLDMIDNLMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
248-595 A Southfield MI 9714 GRID 4 COMMUNICATIONS, INC. - MI 340      
248-595 0 Southfield MI 9714 GRID 4 COMMUNICATIONS, INC. - MI 340   2006-06-22   
248-657 A Clarkston MI 9714 GRID 4 COMMUNICATIONS, INC. - MI 340      
248-657 1 Clarkston MI 9714 GRID 4 COMMUNICATIONS, INC. - MI 340   2014-10-26   
248-710 A Rochester MI 9714 GRID 4 COMMUNICATIONS, INC. - MI 340      
248-710 1 Rochester MI 9714 GRID 4 COMMUNICATIONS, INC. - MI 340   2015-04-18   
734-881 A Ann Arbor MI 9714 GRID 4 COMMUNICATIONS, INC. - MI 340      
734-881 1 Ann Arbor MI 9714 GRID 4 COMMUNICATIONS, INC. - MI 340   2015-04-18   
810-660 A Lapeer MI 9714 GRID 4 COMMUNICATIONS, INC. - MI 340      
810-660 6 Lapeer MI 9714 GRID 4 COMMUNICATIONS, INC. - MI 340   2006-09-21   
810-771 A Grand Blanc MI 9714 GRID 4 COMMUNICATIONS, INC. - MI 340      
810-771 0 Grand Blanc MI 9714 GRID 4 COMMUNICATIONS, INC. - MI 340   2006-11-17   

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

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