Ermington is located 19 kilometres West of the Sydney central business district, in the local government area of the City of Parramatta.

[9] Jamed Hartwell Williams, a well known colonist and long time American Consul resided at 'Marion' for several years in the early 1870s.

The Police Magistrate to Parramatta, Major Edmund Lockyer, purchased the land in 1827 and built the stone mansion Ermington - named after the parish in Devon, England, where his second wife, Sarah Morris, was born.

During March 1822 Australia's first wine export was shipped to England from Blaxland's 'Brush Farm' vineyard in Ermington.

[11] From the 1830s, the Ermington region became an important source of fruit for early Sydney, and it was a busy place in the packing season.

Produce such as oranges, lemons, apples and apricots was carted down to Pennant Hills Wharf, and small boats including the Amy and the Growers Friend would transport it on to the markets in Sydney.

Blue metal from the quarry in present-day Dundas Valley was also transported to Sydney for road building.

Many years later the land was acquired by John Bridge Ltd, who engaged surveyors Lockie, Gannon, Worley and Campbell to prepare the current curvilinear design in 1930.

[12] Further south, parts of the lower area adjacent to the Parramatta River were filled in the early 1930s in anticipation of a residential subdivision, also to be known as the Broadoaks Estate.

Seven large nissen-style storage and repair warehouses were constructed to serve as a supplies store for the United States Army during World War II.

[13][14] In 1945, the Australian government acquired many of the orchards and nurseries in Ermington, commenced large-scale subdivision and built hundreds of Housing and War Commission dwellings to accommodate returned servicemen and their families.

Since the Sydney property boom in the early 2000s, a wave of young families have settled in Ermington in search for affordable houses, while the continued development of Parramatta attracts professional workers.

In 2006/07, the site of the former Ermington Naval Storage Depot was cleared and Stockland commenced development of its Riverwalk estate, featuring high-market housing beside the Parramatta River.

The Ermington Shopping Centre, opened in 1958,[18] was an "essential amenity" for the hundreds of families in the new Housing and War Commission Homes.

Timor Barracks is just inside the northern boundary of Ermington, on the corner of Kissing Point Road and Stewart Street.

It enters a culvert and runs underneath Fremont Avenue at the bottom of the valley near house number 23.

Victoria Road (A40) is a major route connecting Parramatta with Anzac Bridge and passes through Ermington.

It intersects with Victoria Road at a flyover interchange on the western edge of Ermington and crosses the Parramatta River over Silverwater Bridge.

This route then travels along the industrial section of Rydalmere along South Street and via the ferry wharf towards Parramatta.

George Kendall Riverside park also contains a number of locations fit for community or family based activities.