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: MTCLMIMNDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
586-239 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-307 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-463 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-465 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-466 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-468 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-469 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-493 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-783 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      
586-954 A Mount Clemens MI 9323 MICHIGAN BELL TEL CO 340      

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

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