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: MTVRWAXXBMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
360-404 A Mount Vernon WA 483E ONVOY, LLC - WA 674      
360-404 7 Mount Vernon WA 483E ONVOY, LLC - WA 674   2021-07-09   
564-565 A Whatcom County WA 483E ONVOY, LLC - WA 674      
564-565 2 Whatcom County WA 483E ONVOY, LLC - WA 674   2023-01-15   
564-565 3 Whatcom County WA 483E ONVOY, LLC - WA 674   2023-01-15   
564-565 4 Whatcom County WA 483E ONVOY, LLC - WA 674   2023-01-15   
564-565 5 Whatcom County WA 483E ONVOY, LLC - WA 674   2023-01-15   
564-565 6 Whatcom County WA 483E ONVOY, LLC - WA 674   2023-01-15   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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