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: THRRMIXTDS0

Remotes:

Switch Switch name Switch type
CNVIMIXHRS0  CENTREVILLE  GTR 
COLNMIXGRS0  COLON  GTR 
MNDNMIXGRS0  MENDON  GTR 
MRCLMIXGRS0  MARCELLUS  GTR 
SCHLMIXGRS0  SCHOOLCRAFT  GTR 
THRRMIXHRS0  COREY LAKE  GTR 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
269-273 A Three Rivers MI 0695 FRONTIER NORTH, INC. - MI 348      
269-278 A Three Rivers MI 0695 FRONTIER NORTH, INC. - MI 348      
269-279 A Three Rivers MI 0695 FRONTIER NORTH, INC. - MI 348      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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