Home Postcodes by state SA 5331 Postcode 5331 5331 is the postcode for Kingston On Murray, SA. Localities with postcode 5331Kingston On MurraySA Postcode 5331 State or territory South Australia (SA) Localities 1 Council area Loxton Waikerie Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5330 · Postcode 5332