Home Postcode finder NSW Castle Hill Castle Hill postcode NSW Castle Hill is a locality in New South Wales covered by postcode 2154. Postcode 2154 State or territory New South Wales (NSW) Region Seven Hills Add a free Castle Hill business listing More business listings in Castle Hill Businesses in Castle Hill246 Asbestos ConsultingCastle Hill · 61400195967360 Action Park18 Anella Ave, Castle Hill NSW, Australia · +61 477 040 022A Class AutomotiveD3 2A Victoria Avenue · (029) 634-5024 Common questionsWhat is the postcode for Castle Hill?Castle Hill, NSW has the postcode 2154.What state is Castle Hill in?Castle Hill is in New South Wales (NSW).Does postcode 2154 cover more than one suburb?No. Postcode 2154 covers Castle Hill only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.