Home Postcode finder NSW Blackwall Blackwall postcode NSW Blackwall is a locality in New South Wales covered by postcode 2256. Postcode 2256 State or territory New South Wales (NSW) Region Gosford Add a free Blackwall business listing More business listings in Blackwall Businesses in BlackwallWSG Group15 Koonora Ave, Blackwall NSW 2256, Australia · 1800 186 597 Common questionsWhat is the postcode for Blackwall?Blackwall, NSW has the postcode 2256.What state is Blackwall in?Blackwall is in New South Wales (NSW).Does postcode 2256 cover more than one suburb?Yes. Postcode 2256 covers 10 localities, so the postcode alone does not identify Blackwall. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.