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: GRWNMIMNRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
231-276 A Interlochen MI 9323 MICHIGAN BELL TEL CO 348      
231-276 0 Interlochen MI 9323 MICHIGAN BELL TEL CO 348      
231-276 4 Interlochen MI 9323 MICHIGAN BELL TEL CO 348      
231-276 5 Interlochen MI 9323 MICHIGAN BELL TEL CO 348      
231-276 6 Interlochen MI 9323 MICHIGAN BELL TEL CO 348      
231-276 7 Interlochen MI 9323 MICHIGAN BELL TEL CO 348      
231-276 9 Interlochen MI 9323 MICHIGAN BELL TEL CO 348      
231-943 A Traverse City MI 9323 MICHIGAN BELL TEL CO 348      
231-943 0 Traverse City MI 9323 MICHIGAN BELL TEL CO 348      
231-943 3 Traverse City MI 9323 MICHIGAN BELL TEL CO 348      
231-943 4 Traverse City MI 9323 MICHIGAN BELL TEL CO 348      
231-943 5 Traverse City MI 9323 MICHIGAN BELL TEL CO 348      
231-943 7 Traverse City MI 9323 MICHIGAN BELL TEL CO 348      
231-943 8 Traverse City MI 9323 MICHIGAN BELL TEL CO 348      
231-943 9 Traverse City MI 9323 MICHIGAN BELL TEL CO 348      

Last updated: Tue, 07 Oct 2025 16:47:53 UTC

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