Home Postcodes by state SA 5018 Postcode 5018 5018 is the postcode for 2 localities in SA: North Haven and Outer Harbor. Localities with postcode 5018North HavenSAOuter HarborSA Postcode 5018 State or territory South Australia (SA) Localities 2 Council area Port Adelaide Enfield Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5017 · Postcode 5019