Home Postcode finder NSWRV Mount Austin Mount Austin postcode NSWRV Mount Austin is a locality in New South Wales covered by postcode 2650. Postcode 2650 State or territory New South Wales (NSWRV) Region Canberra Add a free Mount Austin business listing Be the first listing in Mount Austin Common questionsWhat is the postcode for Mount Austin?Mount Austin, NSWRV has the postcode 2650.What state is Mount Austin in?Mount Austin is in New South Wales (NSWRV).Does postcode 2650 cover more than one suburb?Yes. Postcode 2650 covers 52 localities, so the postcode alone does not identify Mount Austin. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.