Home Postcode finder WA Southern Cross Southern Cross postcode WA Southern Cross 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 Southern Cross business listing More business listings in Southern Cross Businesses in Southern CrossSouthern Cross District High School28-42 Antares St · 08 90491067St Joseph's School44 Altair St · 08 90491046THE CLUB HOTEL21 Antares Street, Southern Cross WA 6426, Australia · (08) 6424 8833 Common questionsWhat is the postcode for Southern Cross?Southern Cross, WA has the postcode 6426.What state is Southern Cross in?Southern Cross 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 Southern Cross. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.