Thornleigh
| Thornleigh Sydney, New South Wales | |||||||||||||||
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Federation style home, Station Street | |||||||||||||||
| Population | 8,898 (2021 census) | ||||||||||||||
| • 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) | Wahroonga | ||||||||||||||
| 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.