Home Postcode finder NSW Topi Topi Topi Topi postcode NSW Topi Topi is a locality in New South Wales covered by postcode 2423. Postcode 2423 State or territory New South Wales (NSW) Region Hunter Add a free Topi Topi business listing Be the first listing in Topi Topi Common questionsWhat is the postcode for Topi Topi?Topi Topi, NSW has the postcode 2423.What state is Topi Topi in?Topi Topi is in New South Wales (NSW).Does postcode 2423 cover more than one suburb?Yes. Postcode 2423 covers 20 localities, so the postcode alone does not identify Topi Topi. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.