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: CDLCMIMNDS0

Remotes:

Switch Switch name Switch type
BLDWMIMNRSA  BALDWIN  5ER 
HRTAMIMNRSA  HARRIETTA  5ER 
LROYMIMNRSA  LE ROY  5ER 
LTHRMIMNRSA  LUTHER  5ER 
MARNMIMNRSA  MARION  5ER 
MNTNMIMNRSA  MANTON  5ER 
RDCYMIMNRSA  REED CITY  5ER 
TUSTMIMNRSA  TUSTIN  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
231-775 A Cadillac MI 9323 MICHIGAN BELL TEL CO 348      
231-779 A Cadillac MI 9323 MICHIGAN BELL TEL CO 348      
231-876 A Cadillac MI 9323 MICHIGAN BELL TEL CO 348      

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

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