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.

NPA: 206 [Rate centres in NPA 206] [Dial plan for NPA 206]

NXX: 599

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
206-599 A Seattle WA STTLWA05DS0  9638 QWEST CORPORATION 674      
206-599 0 Seattle WA STTLWACHDS0  9638 QWEST CORPORATION 674      
206-599 1 Seattle WA STTLWA05DS0  9638 QWEST CORPORATION 674      
206-599 2 Seattle WA STTLWA05DS0  9638 QWEST CORPORATION 674      
206-599 3 Seattle WA STTLWA05DS0  9638 QWEST CORPORATION 674      
206-599 4 Seattle WA STTLWA05DS0  9638 QWEST CORPORATION 674      
206-599 5 Seattle WA STTLWA05DS0  9638 QWEST CORPORATION 674      
206-599 6 Seattle WA STTLWA05DS0  9638 QWEST CORPORATION 674      
206-599 7 Seattle WA STTLWA05DS0  9638 QWEST CORPORATION 674      
206-599 8 Seattle WA STTLWA05DS0  9638 QWEST CORPORATION 674      
206-599 9 Seattle WA TACNWADNCM6  6010 NEW CINGULAR WIRELESS PCS, LLC 674   2005-07-24   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.