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: MTCLMINRDS0

Remotes:

Switch Switch name Switch type
ALGNMIMNRS0  ALGONAC  5ER 
HRISMIMNRSA  HARSENS ISLAND  5ER 
MRCYMIMNRSA  MARINE CITY  5ER 
NBMRMIMNRS1  NEW BALTIMORE  EXM 
NWHNMIMNRSA  NEW HAVEN  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
586-421 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-421 0 Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-421 1 Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-421 2 Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-421 3 Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-421 9 Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-598 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-948 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-948 0 Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-948 1 Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-948 2 Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-948 3 Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-948 4 Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-948 5 Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-948 6 Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-949 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      

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

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