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.
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Switch: NWHNMIMNRSA

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
586-749 A New Haven MI 9323 MICHIGAN BELL TEL CO 340      

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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