hyde-park-castletown postcode qld Home ›› Postcode Finder ›› QLD ›› Hyde-Park-Castletown Hyde Park Castletown local listingsThe suburb of Hyde Park Castletown is located in QLD and has a postcode of 4812. Free hyde park castletown business listing! Get the first free listing in hyde park castletown! Search and find other Postcodes in Queensland or widen the search to Postcodes in Australia.