The City of Penrith is a local government area in the state of New South Wales, Australia. The seat of the city is located in Penrith, located about 50 kilometres (31 mi) west of Sydney's central business district.It occupies part of the traditional lands of the Darug people. First incorporated as a municipality on 12 May 1871, on 1 January 1949, the municipalities of Penrith, St Marys and Castlereagh and part of the Nepean Shire amalgamated to form a new Municipality of Penrith.