Greenethorpe is a town in the Central West region of New South Wales, Australia. The town is located in the Weddin Shire local government area, 345 kilometres (214 mi) west of the state capital, Sydney. At the2011 census, Greenethorpe and the surrounding area had a population of 320.The village, with the associated "Mount Oriel" homestead (known locally as Iandra Castle), is a rare example in Australia of the manorial system, "the likes of which may not exist elsewhere in the state or nation".