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: TAYLMIWKDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
313-291 A Detroit Zone 6 MI 9323 MICHIGAN BELL TEL CO 340      
313-292 A Detroit Zone 6 MI 9323 MICHIGAN BELL TEL CO 340      
313-295 A Detroit Zone 6 MI 9323 MICHIGAN BELL TEL CO 340      
313-299 A Detroit Zone 6 MI 9323 MICHIGAN BELL TEL CO 340      
313-375 A Detroit Zone 6 MI 9323 MICHIGAN BELL TEL CO 340      
734-287 A Wyandotte MI 9323 MICHIGAN BELL TEL CO 340      
734-374 A Wyandotte MI 9323 MICHIGAN BELL TEL CO 340      
734-946 A Romulus MI 9323 MICHIGAN BELL TEL CO 340      
734-947 A Romulus MI 9323 MICHIGAN BELL TEL CO 340      

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

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