Home Postcodes by state SA 5413 Postcode 5413 5413 is the postcode for 9 localities in SA: Apoinga, Black Springs, Marrabel, Saddleworth, Steelton, Tarnma and 3 more. Localities with postcode 5413ApoingaSABlack SpringsSAMarrabelSASaddleworthSASteeltonSATarnmaSATothill BeltSATothill CreekSAWaterlooSA Postcode 5413 State or territory South Australia (SA) Localities 9 Council area Goyder; Clare and Gilbert Valleys Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5412 · Postcode 5414