Home Postcode finder NSW Upper Macdonald Upper Macdonald postcode NSW Upper Macdonald is a locality in New South Wales covered by postcode 2775. Postcode 2775 State or territory New South Wales (NSW) Region Seven Hills Add a free Upper Macdonald business listing Be the first listing in Upper Macdonald Common questionsWhat is the postcode for Upper Macdonald?Upper Macdonald, NSW has the postcode 2775.What state is Upper Macdonald in?Upper Macdonald is in New South Wales (NSW).Does postcode 2775 cover more than one suburb?Yes. Postcode 2775 covers 17 localities, so the postcode alone does not identify Upper Macdonald. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.