Home Postcodes by state SA 5633 Postcode 5633 5633 is the postcode for 2 localities in SA: Boonerdo and Lock. Localities with postcode 5633BoonerdoSALockSA Postcode 5633 State or territory South Australia (SA) Localities 2 Council area Cleve; Elliston Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5632 · Postcode 5640