Home Postcodes by state SA 5342 Postcode 5342 5342 is the postcode for Monash, SA. Localities with postcode 5342MonashSA Postcode 5342 State or territory South Australia (SA) Localities 1 Council area Berri Barmera Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5341 · Postcode 5343