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. History 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. Demographics According to the 2016 census, Sadleir had a population of 3,135. 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. The median household income of $861 per week was substantially less than the national average ($1438). In Sadleir 56.3% of people were born in Australia, with the most common countries of birth were Vietnam 7.2%, Lebanon 6.3%, Iraq 3.8%, New Zealand 1.9% and Fiji 1.5%. Education Sadleir Public School is the only school in the suburb. The nearest high school is in neighbouring Miller and Ashcroft, New South Wales. References Suburbs of Sydney City of Liverpool (New South Wales)