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: ESTNMDES5MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-200 A Easton MD 7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 242      
410-600 A Berlin MD 7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 242      
443-446 A Queenstown MD 7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 242      
667-264 A Delmar MD 7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 242      
667-343 A Cambridge MD 7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 242      

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

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