Thornleigh Sydney, New South Wales | |||||||||||||||
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Population | 8,898 (2021 census)[1] | ||||||||||||||
• Density | 2,220/km2 (5,800/sq mi) | ||||||||||||||
Established | 1830s | ||||||||||||||
Postcode(s) | 2120 | ||||||||||||||
Elevation | 170 m (558 ft) | ||||||||||||||
Area | 4 km2 (1.5 sq mi) | ||||||||||||||
Location | 22 km (14 mi) north-west of Sydney CBD | ||||||||||||||
LGA(s) | Hornsby Shire | ||||||||||||||
State electorate(s) | |||||||||||||||
Federal division(s) | Berowra | ||||||||||||||
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Thornleigh is a suburb in the Upper North Shore region of Sydney in the state of New South Wales, Australia. Thornleigh is located 22 kilometres north-west of the Sydney central business district in the local government area of Hornsby Shire. The source of the Lane Cove River is located in Thornleigh.