Home Postcode finder NSW Macquarie Marshes Macquarie Marshes postcode NSW Macquarie Marshes is a locality in New South Wales covered by postcode 2831. Postcode 2831 State or territory New South Wales (NSW) Region NSW Country West Add a free Macquarie Marshes business listing Be the first listing in Macquarie Marshes Common questionsWhat is the postcode for Macquarie Marshes?Macquarie Marshes, NSW has the postcode 2831.What state is Macquarie Marshes in?Macquarie Marshes is in New South Wales (NSW).Does postcode 2831 cover more than one suburb?Yes. Postcode 2831 covers 23 localities, so the postcode alone does not identify Macquarie Marshes. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.