Castle Hill, New South Wales
| Castle Hill Sydney, New South Wales | |||||||||||||||
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Public school (1879) | |||||||||||||||
| Coordinates | 33°43′45″S 151°0′14″E / 33.72917°S 151.00389°E | ||||||||||||||
| Population | 40,874 (2021 census) | ||||||||||||||
| Established | 1802 | ||||||||||||||
| Postcode(s) | 2154 | ||||||||||||||
| Elevation | 142 m (466 ft) | ||||||||||||||
| Location | 34 km (21 mi) north-west of Sydney CBD | ||||||||||||||
| LGA(s) | |||||||||||||||
| State electorate(s) | Castle Hill | ||||||||||||||
| Federal division(s) | Mitchell | ||||||||||||||
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Castle Hill is a suburb of Sydney, New South Wales, Australia, located 34 kilometres north-west of the Sydney central business district and 9.5 kilometres north of Parramatta. It is within the Hills District region, split between the local government areas of The Hills Shire and Hornsby Shire.