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: FRDRMDFRXPX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
227-800 A Frederick MD 624H ONVOY SPECTRUM, LLC 240   2025-01-02   
240-835 A Clear Spring MD 624H ONVOY SPECTRUM, LLC 240      
240-840 A Frederick MD 624H ONVOY SPECTRUM, LLC 240      
301-810 A Buckeystown MD 624H ONVOY SPECTRUM, LLC 240      
681-401 A Berkeley Springs WV 624H ONVOY SPECTRUM, LLC 240      
681-547 A Shepherdstown WV 624H ONVOY SPECTRUM, LLC 240   2024-11-30   
814-974 A Hewitt PA 624H ONVOY SPECTRUM, LLC 240      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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