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: BYCYMIWSDS0

Remotes:

Switch Switch name Switch type
AUBNMIMNRSA  AUBURN  5ER 
CLARMICLRSA  CLARE  5ER 
CLMNMIMNRSA  COLEMAN  5ER 
ETWSMIMNRSA  EAST TAWAS  5ER 
FRWLMIMNRSA  FARWELL  5ER 
LNWDMIMNRSA  LINWOOD  5ER 
OSCDMIMNRSA  OSCODA  5ER 
RSBHMIMNRS0  ROSEBUSH  5ER 
STHLMIMNRSA  ST HELEN  5ER 
STNDMIMNRSA  STANDISH  5ER 
WBRNMIMNRSA  WEST BRANCH  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
989-316 A Bay City MI 9323 MICHIGAN BELL TEL CO 344      
989-667 A Bay City MI 9323 MICHIGAN BELL TEL CO 344      
989-671 A Bay City MI 9323 MICHIGAN BELL TEL CO 344      
989-684 A Bay City MI 9323 MICHIGAN BELL TEL CO 344      
989-686 A Bay City MI 9323 MICHIGAN BELL TEL CO 344      

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

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