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.
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Switch: BOTHWAAK2MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
360-421 A Mount Vernon WA 6529 T-MOBILE USA, INC. 674      
360-540 A Mount Vernon WA 6529 T-MOBILE USA, INC. 674      
360-610 A Mount Vernon WA 6529 T-MOBILE USA, INC. 674   2024-02-09   
360-661 A Mount Vernon WA 5562 METROPCS, INC. 674   2024-02-09   
360-840 A Mount Vernon WA 6529 T-MOBILE USA, INC. 674      
360-982 A Mount Vernon WA 6529 T-MOBILE USA, INC. 674      
564-260 A Mount Vernon WA 6529 T-MOBILE USA, INC. 674   2024-11-15   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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