Home Postcode finder NSW Main Creek Main Creek postcode NSW Main Creek is a locality in New South Wales covered by postcode 2420. Postcode 2420 State or territory New South Wales (NSW) Region Hunter Add a free Main Creek business listing Be the first listing in Main Creek Common questionsWhat is the postcode for Main Creek?Main Creek, NSW has the postcode 2420.What state is Main Creek in?Main Creek is in New South Wales (NSW).Does postcode 2420 cover more than one suburb?Yes. Postcode 2420 covers 23 localities, so the postcode alone does not identify Main Creek. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.