Home Postcode finder WA Dumbarton Dumbarton postcode WA Dumbarton is a locality in Western Australia covered by postcode 6566. Postcode 6566 State or territory Western Australia (WA) Region Wa Subs 4 Coast Add a free Dumbarton business listing More business listings in Dumbarton Businesses in DumbartonVernice Pty Ltd6 Extracts Place, Dumbarton WA 6566, Australia · 0400750683 Common questionsWhat is the postcode for Dumbarton?Dumbarton, WA has the postcode 6566.What state is Dumbarton in?Dumbarton is in Western Australia (WA).Does postcode 6566 cover more than one suburb?Yes. Postcode 6566 covers 10 localities, so the postcode alone does not identify Dumbarton. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.