Home Postcode finder WA Spencers Brook Spencers Brook postcode WA Spencers Brook is a locality in Western Australia covered by postcode 6401. Postcode 6401 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Spencers Brook business listing Be the first listing in Spencers Brook Common questionsWhat is the postcode for Spencers Brook?Spencers Brook, WA has the postcode 6401.What state is Spencers Brook in?Spencers Brook is in Western Australia (WA).Does postcode 6401 cover more than one suburb?Yes. Postcode 6401 covers 18 localities, so the postcode alone does not identify Spencers Brook. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.