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: WASHDC12KMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-744 8 Washington Zone 2 MD 145J TERRA NOVA TELECOM INC. 236   2021-06-10   
240-898 9 Washington Zone 4 MD 145J TERRA NOVA TELECOM INC. 236   2021-07-22   
540-242 6 Stafford VA 145J TERRA NOVA TELECOM INC. 236   2026-01-19   
571-400 A Washington Zone 8 VA 145J TERRA NOVA TELECOM INC. 236      
571-600 A Dulles Metro VA 145J TERRA NOVA TELECOM INC. 236      
571-626 3 Triangle VA 145J TERRA NOVA TELECOM INC. 236   2026-01-19   
703-672 4 Lorton VA 145J TERRA NOVA TELECOM INC. 236   2021-09-23   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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