Grantham Farm is a suburb of Sydney, in the state of New South Wales, Australia. Grantham Farm is located in north-west Sydney in the local government area of Blacktown.

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Grantham Farm Sydney, New South Wales
Grantham Farm
Coordinates	33°39′36″S 150°52′00″E
Population	3,669 (SAL 2021)[1]
Established	2020
Postcode(s)	2765
Elevation	33 m (108 ft)
Area	3.62 km2 (1.4 sq mi)[2]
Location	36 km (22 mi) north-west of Sydney CBD
State electorate(s)	Riverstone
Federal division(s)	Greenway
Suburbs around Grantham Farm: Riverstone Vineyard Vineyard Riverstone Grantham Farm Box Hill Riverstone Rouse Hill Box Hill

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Grantham Farm was gazetted on 6 November 2020.^[2][3] It was previously a part of Riverstone.

The suburb is named after the Grantham Farm Estate, which was a subdivision of the original land grant of 'Riverstone'. The land grant was given to Lieutenant-Colonel Maurice Charles O'Connell by Governor Lachlan Macquarie in 1810. The estate contained a 6-bedroom cottage and other outbuildings as well as vineyards.^[2][4][5]

According to the 2021 census of population, there were 3,669 people in Grantham Farm. 53.9% of people were born in Australia and 52.8% of people spoke only English at home. The most common responses for religion in Grantham Farm were Catholic 25.8%, Hinduism 17.3% and No Religion 19.7%.