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: SLDLWASIDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
360-204 A Silverdale WA 9638 QWEST CORPORATION 674      
360-307 A Silverdale WA 9638 QWEST CORPORATION 674      
360-308 A Silverdale WA 9638 QWEST CORPORATION 674      
360-337 A Silverdale WA 9638 QWEST CORPORATION 674      
360-613 A Silverdale WA 9638 QWEST CORPORATION 674      
360-662 A Silverdale WA 9638 QWEST CORPORATION 674      
360-692 A Silverdale WA 9638 QWEST CORPORATION 674      
360-698 A Silverdale WA 9638 QWEST CORPORATION 674      
564-240 A Silverdale WA 9638 QWEST CORPORATION 674      

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

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