Home Postcode finder NSW Marchmont Marchmont postcode NSW Marchmont is a locality in New South Wales covered by postcode 2582. Postcode 2582 State or territory New South Wales (NSW) Region Canberra Add a free Marchmont business listing Be the first listing in Marchmont Common questionsWhat is the postcode for Marchmont?Marchmont, NSW has the postcode 2582.What state is Marchmont in?Marchmont is in New South Wales (NSW).Does postcode 2582 cover more than one suburb?Yes. Postcode 2582 covers 22 localities, so the postcode alone does not identify Marchmont. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.