Home Postcodes by state QLD 4073 Postcode 4073 4073 is the postcode for 2 localities in QLD: Seventeen Mile Rocks and Sinnamon Park. Localities with postcode 4073Seventeen Mile RocksQLDSinnamon ParkQLD Postcode 4073 State or territory Queensland (QLD) Localities 2 Council area Brisbane Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4072 · Postcode 4074