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: WASLDCRGDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
202-241 A Washington Zone 1 DC 280E YMAX COMMUNICATIONS CORP. - DC 236      
301-534 A Indian Head MD 281E YMAX COMMUNICATIONS CORP. - MD 236      
571-374 A Independent Hill VA 367E YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 236      
571-377 A Manassas VA 367E YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 236      
571-399 A Independent Hill VA 367E YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 236      

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

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