Home Postcode finder NSW Mount Irvine Mount Irvine postcode NSW Mount Irvine is a locality in New South Wales covered by postcode 2786. Postcode 2786 State or territory New South Wales (NSW) Region Nepean Add a free Mount Irvine business listing Be the first listing in Mount Irvine Common questionsWhat is the postcode for Mount Irvine?Mount Irvine, NSW has the postcode 2786.What state is Mount Irvine in?Mount Irvine is in New South Wales (NSW).Does postcode 2786 cover more than one suburb?Yes. Postcode 2786 covers 5 localities, so the postcode alone does not identify Mount Irvine. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.