alton-downs postcode qld Home ›› Postcode Finder ›› QLD ›› Alton-Downs Alton Downs local listingsThe suburb of Alton Downs is located in QLD and has a postcode of 4702. Free alton downs business listing! Get the first free listing in alton downs! Search and find other Postcodes in Queensland or widen the search to Postcodes in Australia.