Home Postcode finder NSW Coomba Park Coomba Park postcode NSW Coomba Park is a locality in New South Wales covered by postcode 2428. Postcode 2428 State or territory New South Wales (NSW) Region Hunter Add a free Coomba Park business listing Be the first listing in Coomba Park Common questionsWhat is the postcode for Coomba Park?Coomba Park, NSW has the postcode 2428.What state is Coomba Park in?Coomba Park is in New South Wales (NSW).Does postcode 2428 cover more than one suburb?Yes. Postcode 2428 covers 21 localities, so the postcode alone does not identify Coomba Park. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.