Home Postcodes by state QLD 4161 Postcode 4161 4161 is the postcode for Alexandra Hills, QLD. Localities with postcode 4161Alexandra HillsQLD Postcode 4161 State or territory Queensland (QLD) Localities 1 Council area Redland Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4160 · Postcode 4163