It was named in June 1792 after Governor Arthur Phillip asked the local Aboriginal people what they called the place.

Governor Phillip established a government farm and convict station on 640 acres (259 ha) in 1791 to grow food for the colony.

The first post office in the area was opened after many years of campaigning by local residents in 1887 in a private house on Old Windsor Road and this arrangement continued until the 1960s.

[citation needed] The first post master was a Mr Birks and he was paid 25 pounds a year to manage the office and bring the mail bag over from Seven Hills on horseback each day.

By 1922 the number of residents and businesses had grown sufficiently to support a second office in a weatherboard cottage in Wentworth Avenue, known as Toongabbie West.

Later, in 1934, the Group moved to its present location in Bungaree Road on donated land which had also once been part of the Knox landholdings.

To the east of Binalong Road and Reynolds Street is the small suburb known as Old Toongabbie, which includes the sites of the original colonial settlement.

The shopping precinct for many years included a small independent suburban cinema, the "Rocket Theatre",[6] located opposite the railway line, next to the overhead road bridge.

A small park by the name of Portico Plaza, directly opposite the train station and next to Toongabbie Hotel.

The original unstaffed station opened on 26 April 1880 and was upgraded over the years with additional platforms and loading facilities.

Although Toongabbie is relatively densely settled, in recent years programmes of bushland regeneration, and pollution control in local waterways have improved the few and small pockets of vegetation in the suburb.

McCoy Park is located in eastern Toongabbie, next to the border with Seven Hills, and close to a small row of shops.

43.8% of people were born in Australia; the next most common countries of birth were India 20.5%, Sri Lanka 6.0%, Philippines 2.7%, China 2.7% and Nepal 2.1%.

54.8% of people were born in Australia; the next most common countries of birth were India 8.9%, Sri Lanka 4.7%, China (excludes SARs and Taiwan) 2.8%, Philippines 2.7% and New Zealand 2.0%.