Home Postcode finder WA Wellesley Wellesley postcode WA Wellesley is a locality in Western Australia covered by postcode 6233. Postcode 6233 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Wellesley business listing Be the first listing in Wellesley Common questionsWhat is the postcode for Wellesley?Wellesley, WA has the postcode 6233.What state is Wellesley in?Wellesley is in Western Australia (WA).Does postcode 6233 cover more than one suburb?Yes. Postcode 6233 covers 5 localities, so the postcode alone does not identify Wellesley. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.