Home Postcodes by state QLD 4363 Postcode 4363 4363 is the postcode for Southbrook, QLD. Localities with postcode 4363SouthbrookQLD Postcode 4363 State or territory Queensland (QLD) Localities 1 Council area Toowoomba Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4362 · Postcode 4364