Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Sadleir is a suburb in south-western Sydney, in the state of New South Wales, Australia. Sadleir is located 37 kilometres south-west of the Sydney central business district, in the local government area of the City of Liverpool.Sadleir was named after Richard Sadleir, the first mayor of Liverpool in 1872. Sadleir was part of the Green Valley housing estate, which was subdivided in 1960. According to the 2006 census, Sadleir had a population of 2825. The average age was 33, slightly lower than the national average, with higher than expected numbers of people in the 0-14 and 65 plus age groups. There was a significant housing commission population with around a third of the suburb''s dwellings belonging to the Department of Housing.