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: ANARMISEDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
734-350 A Ypsilanti MI 9323 MICHIGAN BELL TEL CO 340      
734-434 A Ypsilanti MI 9323 MICHIGAN BELL TEL CO 340      
734-477 A Ann Arbor MI 9323 MICHIGAN BELL TEL CO 340      
734-528 A Ypsilanti MI 9323 MICHIGAN BELL TEL CO 340      
734-572 A Ypsilanti MI 9323 MICHIGAN BELL TEL CO 340      
734-677 A Ann Arbor MI 9323 MICHIGAN BELL TEL CO 340      
734-695 A Ypsilanti MI 9323 MICHIGAN BELL TEL CO 340      
734-712 A Ypsilanti MI 9323 MICHIGAN BELL TEL CO 340      
734-971 A Ann Arbor MI 9323 MICHIGAN BELL TEL CO 340      
734-973 A Ann Arbor MI 9323 MICHIGAN BELL TEL CO 340      
734-975 A Ann Arbor MI 9323 MICHIGAN BELL TEL CO 340      

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

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