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: STTLWA04DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
206-306 A Seattle WA 9638 QWEST CORPORATION 674      
206-361 A Seattle WA 9638 QWEST CORPORATION 674      
206-362 A Seattle WA 9638 QWEST CORPORATION 674      
206-363 A Seattle WA 9638 QWEST CORPORATION 674      
206-364 A Seattle WA 9638 QWEST CORPORATION 674      
206-365 A Seattle WA 9638 QWEST CORPORATION 674      
206-366 A Seattle WA 9638 QWEST CORPORATION 674      
206-367 A Seattle WA 9638 QWEST CORPORATION 674      
206-368 A Seattle WA 9638 QWEST CORPORATION 674      
206-417 A Seattle WA 9638 QWEST CORPORATION 674      
206-418 A Seattle WA 9638 QWEST CORPORATION 674      
206-440 A Seattle WA 9638 QWEST CORPORATION 674      

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

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