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: HGPKMITSDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
313-252 A Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      
313-852 A Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      
313-865 A Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      
313-866 A Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      
313-867 A Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      
313-868 A Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      
313-869 A Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      
313-883 A Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      
313-956 A Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      
313-957 A Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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