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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Union, MO

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
636-666 5   093F ONVOY, LLC - MO 520   2023-10-22   
636-666 6   145J TERRA NOVA TELECOM INC. 520   2019-02-22   
636-666 7   093F ONVOY, LLC - MO 520   2023-10-22   
636-666 8   093F ONVOY, LLC - MO 520   2024-03-03   
636-666 9   093F ONVOY, LLC - MO 520   2024-07-05   

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Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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