Home Postcode finder WA Walpole Walpole postcode WA Walpole is a locality in Western Australia covered by postcode 6398. Postcode 6398 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Walpole business listing More business listings in Walpole Businesses in WalpoleWalpole Primary SchoolLatham & Swan Sts · 08 98401020 Common questionsWhat is the postcode for Walpole?Walpole, WA has the postcode 6398.What state is Walpole in?Walpole is in Western Australia (WA).Does postcode 6398 cover more than one suburb?Yes. Postcode 6398 covers 3 localities, so the postcode alone does not identify Walpole. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.