Home Postcodes by state WA South Murchison South Murchison postcode WA South Murchison is a locality in Western Australia covered by postcode 6635. Postcode 6635 State or territory Western Australia (WA) Region Wa Subs 4 Coast Council area Murchison Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Add a free South Murchison business listing Be the first listing in South Murchison Also in postcode 6635YalgooWA 6635 Common questionsWhat is the postcode for South Murchison?South Murchison, WA has the postcode 6635.What state is South Murchison in?South Murchison is in Western Australia (WA).What council is South Murchison in?South Murchison is in the Murchison local government area.Does postcode 6635 cover more than one suburb?Yes. Postcode 6635 covers 2 localities, so the postcode alone does not identify South Murchison. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.