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: SLBRMD901MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
667-266 A Salisbury MD 939H COMMIO, LLC 242      
667-389 A Cambridge MD 939H COMMIO, LLC 242      
667-449 A Preston MD 939H COMMIO, LLC 242      
667-457 A Church Hill MD 939H COMMIO, LLC 242   2024-01-25   
667-459 A Oxford MD 939H COMMIO, LLC 242   2024-01-25   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.