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