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: STTLWAWBY0X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
206-635 A Seattle WA 425J CSC WIRELESS, LLC 674      
206-635 2 Seattle WA 425J CSC WIRELESS, LLC 674   2020-09-03   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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