Home Postcode finder NSW Lost River Lost River postcode NSW Lost River is a locality in New South Wales covered by postcode 2583. Postcode 2583 State or territory New South Wales (NSW) Region Canberra Add a free Lost River business listing Be the first listing in Lost River Common questionsWhat is the postcode for Lost River?Lost River, NSW has the postcode 2583.What state is Lost River in?Lost River is in New South Wales (NSW).Does postcode 2583 cover more than one suburb?Yes. Postcode 2583 covers 16 localities, so the postcode alone does not identify Lost River. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.