Home Postcode finder NSW Coomba Bay Coomba Bay postcode NSW Coomba Bay 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 Bay business listing More business listings in Coomba Bay Businesses in Coomba BayCtrade Australia1588 Coomba Rd · 0431110063 Common questionsWhat is the postcode for Coomba Bay?Coomba Bay, NSW has the postcode 2428.What state is Coomba Bay in?Coomba Bay 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 Bay. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.