Home Postcode finder SA Maslin Beach Maslin Beach postcode SA Maslin Beach is a locality in South Australia covered by postcode 5170. Postcode 5170 State or territory South Australia (SA) Region Adelaide Add a free Maslin Beach business listing Be the first listing in Maslin Beach Common questionsWhat is the postcode for Maslin Beach?Maslin Beach, SA has the postcode 5170.What state is Maslin Beach in?Maslin Beach is in South Australia (SA).Does postcode 5170 cover more than one suburb?No. Postcode 5170 covers Maslin Beach only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in South Australia, or widen the search to every Australian postcode.