Home Postcodes by state SA 5092 Postcode 5092 5092 is the postcode for 3 localities in SA: Modbury, Modbury Heights and Modbury North. Localities with postcode 5092ModburySAModbury HeightsSAModbury NorthSA Postcode 5092 State or territory South Australia (SA) Localities 3 Council area Tea Tree Gully Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5091 · Postcode 5093