Home Postcode finder QLD Castle Hill Castle Hill postcode QLD Castle Hill is a locality in Queensland covered by postcode 4810. Postcode 4810 State or territory Queensland (QLD) Region North QLD Add a free Castle Hill business listing More business listings in Castle Hill Businesses in Castle HillTownsville Concreting Comapny62 Yarrawonga Dr, Castle Hill QLD, Australia · (07) 4439 8639 Common questionsWhat is the postcode for Castle Hill?Castle Hill, QLD has the postcode 4810.What state is Castle Hill in?Castle Hill is in Queensland (QLD).Does postcode 4810 cover more than one suburb?Yes. Postcode 4810 covers 13 localities, so the postcode alone does not identify Castle Hill. Browse other postcodes in Queensland, or widen the search to every Australian postcode.