Home Postcode finder WA Merivale Merivale postcode WA Merivale is a locality in Western Australia covered by postcode 6450. Postcode 6450 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Merivale business listing Be the first listing in Merivale Common questionsWhat is the postcode for Merivale?Merivale, WA has the postcode 6450.What state is Merivale in?Merivale is in Western Australia (WA).Does postcode 6450 cover more than one suburb?Yes. Postcode 6450 covers 23 localities, so the postcode alone does not identify Merivale. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.