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: BLHMWALURS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
360-758 A Whatcom County WA 9638 QWEST CORPORATION 674      
360-778 A Whatcom County WA 9638 QWEST CORPORATION 674      
360-778 0 Whatcom County WA 9638 QWEST CORPORATION 674      
360-778 5 Whatcom County WA 9638 QWEST CORPORATION 674   2015-02-19   
360-778 6 Whatcom County WA 9638 QWEST CORPORATION 674   2015-02-19   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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