Home Postcode finder NSW Newnes Newnes postcode NSW Newnes is a locality in New South Wales covered by postcode 2790. Postcode 2790 State or territory New South Wales (NSW) Region NSW Country West Add a free Newnes business listing Be the first listing in Newnes Common questionsWhat is the postcode for Newnes?Newnes, NSW has the postcode 2790.What state is Newnes in?Newnes is in New South Wales (NSW).Does postcode 2790 cover more than one suburb?Yes. Postcode 2790 covers 40 localities, so the postcode alone does not identify Newnes. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.