Home Postcodes by state SA 5265 Postcode 5265 5265 is the postcode for 2 localities in SA: Coonalpyn and Field. Localities with postcode 5265CoonalpynSAFieldSA Postcode 5265 State or territory South Australia (SA) Localities 2 Council area Coorong Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5264 · Postcode 5266