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.

Switch: MTVRWAXXQMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
564-900 A Mount Vernon WA 624H ONVOY SPECTRUM, LLC 674      
564-900 9 Mount Vernon WA 624H ONVOY SPECTRUM, LLC 674   2022-01-24   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.