Castle Hill (NSW), NSW
By Lauren McCaleb · Reviewed by Dylan Duncan ·
Among Australia's more advantaged suburbs
Castle Hill (NSW) is more socio-economically advantaged than about 97% of the 14,462 Australian suburbs we score, based on the ABS SEIFA index (raw score 1124, where about 1000 is the national average).
A socio-economic measure from ABS Census data — not a measure of how good a suburb is to live in or visit. How we calculate this.
Castle Hill (NSW) at a glance
- Population (2021)
- 40,874
- Median age
- 42
- Median weekly household income
- $2,551
- SEIFA score
- 1124
- Coordinates
- -33.7293, 150.9997
Castle Hill (NSW) demographics (2021 Census)
The figures below profile Castle Hill (NSW) using the Australian Bureau of Statistics 2021 Census; every percentage is a share of a clearly stated Census count, so each one traces back to the source. At a glance, the largest age group is mid-life (45–64) at 26%, 23% of homes are rented, and 45% of residents were born overseas.
Age profile
| Age group | People | Share |
|---|---|---|
| Children (0–14) | 7,674 | 19% |
| Youth (15–24) | 5,091 | 12% |
| Young adults (25–44) | 9,208 | 23% |
| Mid-life (45–64) | 10,754 | 26% |
| Seniors (65+) | 8,155 | 20% |
Share of the 40,882 people counted by age.
Housing and households
| Tenure | Dwellings | Share |
|---|---|---|
| Owned outright | 4,632 | 35% |
| Owned with a mortgage | 4,940 | 37% |
| Rented | 3,032 | 23% |
| Dwelling type | Dwellings | Share |
|---|---|---|
| Houses | 9,748 | 74% |
| Townhouses & semis | 1,436 | 11% |
| Flats & apartments | 2,026 | 15% |
Tenure and dwelling shares are of the roughly 13,217 occupied private dwellings in Castle Hill (NSW).
- Median weekly rent
- $560
- Median monthly mortgage
- $3,000
- Average household size
- 3 people
- Median weekly family income
- $2,858
- Median weekly personal income
- $931
Community and culture
- Born overseas
- 18,144 (45%)
- Speaks a language other than English at home
- 17,283 (44%)
- Aboriginal and/or Torres Strait Islander
- 157 (0%)
Work and education
- Completed Year 12
- 23,935 (76%)
- Labour-force participation
- 61%
- Unemployment rate
- 4.5%
- Employed full-time
- 11,732
- Employed part-time
- 5,687
Source: ABS Census of Population and Housing, 2021 (General Community Profile, by Suburb and Locality). © Australian Bureau of Statistics, released under CC BY 4.0. How we group bands and derive each share is set out on our methodology page.
Weather and climate in Castle Hill (NSW)
Based on 2014–2023 records, the warmest month in Castle Hill (NSW) is January (average daytime high around 28.4°C) and the coolest is July (around 16.8°C). The area receives roughly 854 mm of rain across the year.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 28.4°C | 18.6°C | 85 mm |
| Feb | 27.1°C | 18.1°C | 92 mm |
| Mar | 25.4°C | 16.9°C | 139 mm |
| Apr | 22.9°C | 13.6°C | 72 mm |
| May | 19.7°C | 10°C | 37 mm |
| Jun | 16.7°C | 8°C | 57 mm |
| Jul | 16.8°C | 7.1°C | 56 mm |
| Aug | 17.9°C | 7.6°C | 52 mm |
| Sep | 20.9°C | 9.8°C | 44 mm |
| Oct | 23.7°C | 12.6°C | 77 mm |
| Nov | 25.2°C | 14.7°C | 73 mm |
| Dec | 27.5°C | 16.9°C | 70 mm |
Climate normals, 2014–2023 (Open-Meteo, ERA5 reanalysis).
Common questions about Castle Hill (NSW)
Where is Castle Hill (NSW)?
Castle Hill (NSW) is a suburb of New South Wales, Australia.
What is the population of Castle Hill (NSW)?
At the 2021 Census, Castle Hill (NSW) had a population of about 40,874.
Is Castle Hill (NSW) an advantaged area?
Castle Hill (NSW) has an ABS SEIFA score of 1124, where about 1000 is the national average — higher scores indicate greater relative socio-economic advantage. That gives it a Suburb Score of 97 out of 100 — more socio-economically advantaged than about 97% of Australian suburbs.
What is the weather like in Castle Hill (NSW)?
Castle Hill (NSW) has average daytime highs of about 22.7°C and overnight lows of about 12.8°C, with roughly 854 mm of rain across the year (based on 2014–2023 climate normals).
How big is Castle Hill (NSW)?
Castle Hill (NSW) is one of the most populous suburbs in New South Wales — the 5th-largest by usual resident population at the 2021 Census (about 40,874 usual residents).
Where Castle Hill (NSW) ranks
Castle Hill (NSW) appears in these data-driven guides — each a transparent sort on a single ABS figure shown on this page.
- Largest suburbs in New South Wales#5 of 25
- Largest suburbs in Australia#14 of 25
Nearby suburbs in New South Wales
More suburb guides in New South Wales
Other hand-written, cited guides — browse all guides.