Home Postcode finder NSW Mount White Mount White postcode NSW Mount White is a locality in New South Wales covered by postcode 2250. Postcode 2250 State or territory New South Wales (NSW) Region Gosford Add a free Mount White business listing Be the first listing in Mount White Common questionsWhat is the postcode for Mount White?Mount White, NSW has the postcode 2250.What state is Mount White in?Mount White is in New South Wales (NSW).Does postcode 2250 cover more than one suburb?Yes. Postcode 2250 covers 34 localities, so the postcode alone does not identify Mount White. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.