Home Postcode finder NSW Castlereagh Castlereagh postcode NSW Castlereagh is a locality in New South Wales covered by postcode 2749. Postcode 2749 State or territory New South Wales (NSW) Region Nepean Add a free Castlereagh business listing More business listings in Castlereagh Businesses in CastlereaghBlack N White Catering119 Devlin Road · 04 0702 9551Castlereagh Public School87-101 Post Office Rd · 02 47761197The Lakes Christian College206 East Wilchard Rd · 02 47774057 Common questionsWhat is the postcode for Castlereagh?Castlereagh, NSW has the postcode 2749.What state is Castlereagh in?Castlereagh is in New South Wales (NSW).Does postcode 2749 cover more than one suburb?Yes. Postcode 2749 covers 2 localities, so the postcode alone does not identify Castlereagh. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.