Home Postcode finder NSW Mount Ousley Mount Ousley postcode NSW Mount Ousley is a locality in New South Wales covered by postcode 2519. Postcode 2519 State or territory New South Wales (NSW) Region Illawarra Add a free Mount Ousley business listing Be the first listing in Mount Ousley Common questionsWhat is the postcode for Mount Ousley?Mount Ousley, NSW has the postcode 2519.What state is Mount Ousley in?Mount Ousley is in New South Wales (NSW).Does postcode 2519 cover more than one suburb?Yes. Postcode 2519 covers 5 localities, so the postcode alone does not identify Mount Ousley. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.