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: SFLDMIMKJMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
313-604 A Detroit Zone 1 MI 616J LEAP TELECOM, LLC 340      
313-604 0 Detroit Zone 1 MI 616J LEAP TELECOM, LLC 340   2023-03-20   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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