1946 to 2000 Western Sydney - an outline history
| 1946 | Holroyd | Greystanes House demolished by NSW Blue Metal Company |
| 1946 | Blue Mts | Municipality of Katoomba proclaimed a city |
| 1946 | Southern LGAs | Construction started on Warragamba Dam |
| 1946 | Penrith | Overhead cable system built from Emu Plains to Warragamba to transport gravels for dam construction. |
| 1947 | Blue Mts | The City of Blue Mountains formed by amalgamation of Shire of Blue Mountains, City of Katoomba and Municipality of Blackheath |
| 1948 | Fairfield | Amalgamation of Fairfield and Cabramatta/Canley Vale councils. |
| 1948 | Auburn | Lidcombe and Auburn Councils merged as Auburn Municipal Council |
| 1948 | Auburn | Funeral trains stopped running to the Necropolis. |
| 1951 | Fairfield | Migrant camp constructed at Cabramatta |
| 1951 | Holroyd | Cumberland County Council plan dictated that western third of Holroyd remain green belt and designated Yennora as industrial area |
| 1951 | All | County of Cumberland Planning Scheme, with creation of Green Belt around the metropolitan area, and forcing infill development within it. |
| 1955 | Blacktown; Penrith | Railway line electrified |
| 1957 | Blue Mts | Scenic Skyway opened |
| 1957 | Blacktown | Demolition of Bungarribee House (1825) for an overseas telecommunication facility. |
| 1958 | Fairfield | Club Marconi opened. |
| 1959 | Fairfield | Lansdowne Motel built - claimed to be the first motel in Australia. |
| 1959 | Penrith | Penrith declared a city |
| 1959 | All | Release of some land from green belts for sale gave rise to expectation that rest would be sold - speculation and removal of productive farming land to speculative holdings awaiting permission to subdivide. |
| 1959 | Liverpool | 59 square miles of green belt land released. |
| 1960 | Liverpool | Liverpool declared a city |
| 1960 | Western LGAs | Prospect County Council takes over electricity distribution |
| 1960 | Western LGAs | Warragamba Dam opened |
| 1960 | Liverpool | First motor sport event at Warwick Farm |
| 1962 | Auburn | Silverwater bridge completed |
| 1963 | Penrith | Emu Plains transferred from Blue Mountains City Council to Penrith City Council |
| 1963 | Camden | Camden tram line closed |
| 1964 | Liverpool | Housing development of Green Valley |
| 1964 | Auburn | Newington Asylum closed |
| 1965 | Auburn | Newington transferred to Prisons Department. |
| 1966 | Blacktown | Housing Commission development started at Mt Druitt |
| 1966 | Blacktown | Mount Druitt New Town project was announced by NSW government as a plan for the Housing Commission and War Service Homes Division to build homes for 70,000 people. |
| 1968 | Campbelltown | Railway line from Liverpool to Campbelltown electrified |
| 1968 | Campbelltown | Campbelltown declared a city |
| 1968 | All | State Planning Authority released Sydney Region Outline Plan establishing guidelines for development of Greater Sydney. It permitted extensive re-zoning of rural lands for urban uses, with corridor development out from Sydney along west, south-west and northern routes - with satellite cities on the corridors. |
| 1969 | Auburn | Female prisoners transferred from Long Bay to new women's prison, Mulawa, at Silverwater |
| 1971 | Penrith | Completion of new western freeway from Prospect to Regentville. |
| 1973 | Campbelltown | South Western Freeway opened |
| 1973 | Camden; Campbelltown | New Cities proposal for Campbelltown, Camden and Appin as south-west urban corridor, to be co-ordinated by Macarthur Development Board |
| 1974 | Blacktown | Blacktown to Richmond railway electrified |
| 1974 | Blacktown | State Brickworks established a new works on Richmond Road, Blacktown. |
| 1974 | Auburn | NSW College of Paramedical Studies, later known as Cumberland College, moved to Lidcombe |
| 1975 | Baulkham Hills | Sydney Woollen Mills (Darling Mills) closed |
| 1977 | Liverpool | Chipping Norton Lake Authority Act passed - takes several years to create lake |
| 1982 | Liverpool | Conversion of Casula Powerhouse into an arts centre |
| 1983 | Blacktown | Parklea Prison opened |
| 1983 | Auburn | Land set aside at Homebush Bay for park - completed as Bicentennial Park for 1988. |
| 1986 | Blacktown | Australia's Wonderland opened |
| 1990 | Blacktown | First race at Eastern Creek Raceway |
| 1991 | Holroyd | Holroyd becomes a city |
| 1995 | Auburn | Sydney International Aquatic Centre opened. |
| 1997 | Auburn | Lidcombe Hospital closed |