south-toowoomba postcode qld Home ›› Postcode Finder ›› QLD ›› South-Toowoomba South Toowoomba local listingsThe suburb of South Toowoomba is located in QLD and has a postcode of 4350. Free south toowoomba business listing! Get the first free listing in south toowoomba! Search and find other Postcodes in Queensland or widen the search to Postcodes in Australia.