Home Postcode finder SA West Lakes West Lakes postcode SA West Lakes is a locality in South Australia covered by postcode 5021. Postcode 5021 State or territory South Australia (SA) Region Adelaide Add a free West Lakes business listing Be the first listing in West Lakes Common questionsWhat is the postcode for West Lakes?West Lakes, SA has the postcode 5021.What state is West Lakes in?West Lakes is in South Australia (SA).Does postcode 5021 cover more than one suburb?No. Postcode 5021 covers West Lakes only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in South Australia, or widen the search to every Australian postcode.