Home Postcodes by state SA 5452 Postcode 5452 5452 is the postcode for 2 localities in SA: Leasingham and Watervale. Localities with postcode 5452LeasinghamSAWatervaleSA Postcode 5452 State or territory South Australia (SA) Localities 2 Council area Clare and Gilbert Valleys Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5451 · Postcode 5453