Home Postcode finder SA Lake Carlet Lake Carlet postcode SA Lake Carlet is a locality in South Australia covered by postcode 5238. Postcode 5238 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Lake Carlet business listing Be the first listing in Lake Carlet Common questionsWhat is the postcode for Lake Carlet?Lake Carlet, SA has the postcode 5238.What state is Lake Carlet in?Lake Carlet is in South Australia (SA).Does postcode 5238 cover more than one suburb?Yes. Postcode 5238 covers 31 localities, so the postcode alone does not identify Lake Carlet. Browse other postcodes in South Australia, or widen the search to every Australian postcode.