Home Postcodes by state SA 5073 Postcode 5073 5073 is the postcode for 4 localities in SA: Hectorville, Rostrevor, Tranmere and Tranmere North. Localities with postcode 5073HectorvilleSARostrevorSATranmereSATranmere NorthSA Postcode 5073 State or territory South Australia (SA) Localities 4 Council area Campbelltown Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5072 · Postcode 5074