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: PTHRMIMNDS0

Remotes:

Switch Switch name Switch type
CRSWMIMNRSA  CROSWELL  5ER 
CSVIMIMNRSA  CARSONVILLE  5ER 
LXTNMIMNRSA  LEXINGTON  5ER 
MYVIMIMNRSA  MARYSVILLE  5ER 
PTHRMINRRSA  PORT HURON  5ER 
PTSNMIMNRSA  PORT SANILAC  5ER 
SNDSMIMNRSA  SANDUSKY  5ER 
STCLMIMNRS1  ST CLAIR  EXM 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date

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

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