Home Postcodes by state NSW 2203 Postcode 2203 2203 is the postcode for Dulwich Hill, NSW. Localities with postcode 2203Dulwich HillNSW Postcode 2203 State or territory New South Wales (NSW) Localities 1 Council area Inner West Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2200 · Postcode 2204