Home Postcodes by state SA 5083 Postcode 5083 5083 is the postcode for 3 localities in SA: Broadview, Nailsworth and Sefton Park. Localities with postcode 5083BroadviewSANailsworthSASefton ParkSA Postcode 5083 State or territory South Australia (SA) Localities 3 Council area Mainly Port Adelaide Enfield, partly Prospect; Prospect Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5082 · Postcode 5084