Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Mount Hull, WA

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
509-556 A ORVLWA02DS0  581D SKYLINE TELECOM COMPANY - WA 676      

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

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