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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NPA: 360 [Rate centres in NPA 360] [Dial plan for NPA 360]

NXX: 437

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
360-437 A Port Ludlow WA PTLWWA01DS0  9638 QWEST CORPORATION 674      
360-437 0 Port Ludlow WA   9638 QWEST CORPORATION 674      
360-437 1 Port Ludlow WA   9638 QWEST CORPORATION 674      
360-437 2 Port Ludlow WA   9638 QWEST CORPORATION 674      
360-437 3 Port Ludlow WA   663D ELTOPIA COMMUNICATIONS, LLC - WA 674   2009-04-15   
360-437 4 Port Ludlow WA   9638 QWEST CORPORATION 674      
360-437 5 Port Ludlow WA   9638 QWEST CORPORATION 674      
360-437 6 Port Ludlow WA   483E ONVOY, LLC - WA 674   2007-03-23   
360-437 7 Port Ludlow WA   9638 QWEST CORPORATION 674      
360-437 8 Port Ludlow WA   9638 QWEST CORPORATION 674      
360-437 9 Port Ludlow WA   9638 QWEST CORPORATION 674      

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

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