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: CHCHMDBEPS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-239 A Leonardtown MD 2593 CORE COMMUNICATIONS, INC. - MD 236      
240-279 A Waldorf MD 2593 CORE COMMUNICATIONS, INC. - MD 236      
240-325 A Damascus MD 2593 CORE COMMUNICATIONS, INC. - MD 236      
240-327 A Gaithersburg MD 2593 CORE COMMUNICATIONS, INC. - MD 236      
240-336 A Washington Zone 2 MD 2593 CORE COMMUNICATIONS, INC. - MD 236      
240-800 A Washington Zone 2 MD 2593 CORE COMMUNICATIONS, INC. - MD 236   2012-08-17   
410-509 A Waterloo (Washington DC LATA) MD 8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      
571-402 A Dale City VA 5832 CORETEL VIRGINIA, LLC - VA 236      

Last updated: Wed, 10 Apr 2019 01:22:05 UTC

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