Home Postcode finder WA Southampton Southampton postcode WA Southampton is a locality in Western Australia covered by postcode 6253. Postcode 6253 State or territory Western Australia (WA) Region Wa Subs 3 Sth Rd Add a free Southampton business listing Be the first listing in Southampton Common questionsWhat is the postcode for Southampton?Southampton, WA has the postcode 6253.What state is Southampton in?Southampton is in Western Australia (WA).Does postcode 6253 cover more than one suburb?Yes. Postcode 6253 covers 3 localities, so the postcode alone does not identify Southampton. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.