Home Postcode finder WA Mount Hampton Mount Hampton postcode WA Mount Hampton is a locality in Western Australia covered by postcode 6426. Postcode 6426 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Mount Hampton business listing Be the first listing in Mount Hampton Common questionsWhat is the postcode for Mount Hampton?Mount Hampton, WA has the postcode 6426.What state is Mount Hampton in?Mount Hampton is in Western Australia (WA).Does postcode 6426 cover more than one suburb?Yes. Postcode 6426 covers 14 localities, so the postcode alone does not identify Mount Hampton. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.