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: BLTMMDCHCMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
301-612 A Washington Zone 14 (Baltimore LATA) MD 7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-231 A Essex MD 7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-425 A Parkville MD 7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-883 A Glen Burnie MD 7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-896 A Columbia MD 7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
667-232 A Glen Burnie MD 7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
667-890 A Odenton MD 7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
667-891 A Odenton MD 7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
667-892 A Odenton MD 7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
667-893 A Odenton MD 7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
667-894 A Odenton MD 7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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