Home Postcode finder WA Wellington Mill Wellington Mill postcode WA Wellington Mill is a locality in Western Australia covered by postcode 6236. Postcode 6236 State or territory Western Australia (WA) Region Wa Subs 3 Sth Rd Add a free Wellington Mill business listing Be the first listing in Wellington Mill Common questionsWhat is the postcode for Wellington Mill?Wellington Mill, WA has the postcode 6236.What state is Wellington Mill in?Wellington Mill is in Western Australia (WA).Does postcode 6236 cover more than one suburb?Yes. Postcode 6236 covers 8 localities, so the postcode alone does not identify Wellington Mill. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.