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.

OCN: 732J NUSO, LLC

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
989-364 7 Saginaw MI   344   2025-07-07   
989-391 A Bay City MI SGNWMIACNMD  344      
989-391 6 Bay City MI SGNWMIACNMD  344   2023-03-05   

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Last updated: Sat, 02 May 2026 12:20:53 UTC

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