Blacktown is a suburb in the City of Blacktown, in Greater Western Sydney, in the state of New South Wales, Australia. Blacktown is located 34 kilometres west of the Sydney central business district and is the administrative centre of the local government area of City of Blacktown and the federal division of Chifley, Greenway and McMahon. Blacktown is the largest of any suburb or township in New South Wales and is one of the most multicultural places in Sydney.