Home Postcodes by state SA 5210 Postcode 5210 5210 is the postcode for 3 localities in SA: Mount Compass, Mount Magnificent and Nangkita. Localities with postcode 5210Mount CompassSAMount MagnificentSANangkitaSA Postcode 5210 State or territory South Australia (SA) Localities 3 Council area Alexandrina Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5204 · Postcode 5211