Castle Hill - South
Statistical Area - sa2

Population growth drivers in Castle Hill - South are strong compared to national averages based on AreaSearch's ranking of recent, and medium to long-term trends

Castle Hill - South's population is approximately 10,789 as of August 2025. This figure represents an increase of 370 people since the 2021 Census, which reported a population of 10,419. The change is inferred from ABS estimated resident population data of 10,787 in June 2024 and additional validated new addresses since the Census date. This results in a population density ratio of 2,612 persons per square kilometer, placing Castle Hill - South in the upper quartile relative to national locations assessed by AreaSearch. Over the past decade, Castle Hill - South has shown resilient growth patterns with a compound annual growth rate of 1.1%, outperforming its SA3 area. Overseas migration contributed approximately 79.9% of overall population gains during recent periods.

AreaSearch adopts ABS/Geoscience Australia projections for each SA2 area released in 2024 with a base year of 2022, and NSW State Government's SA2 level projections for areas not covered by this data, released in 2022 with a base year of 2021. Growth rates by age group from these aggregations are applied to all areas for years 2032 to 2041. According to population projections, Castle Hill - South is expected to experience above median growth, adding 1,595 persons by 2041 based on the latest numbers, indicating a total gain of 14.8% over the 17 years.

Residential development activity is lower than average in Castle Hill - South according to AreaSearch's national comparison of local real estate markets

Castle Hill - South has seen approximately 19 dwellings granted development approval annually. From FY21 to FY25, 99 homes were approved, with another 4 given the green light in FY26. On average, each dwelling constructed over these five years brought in 4.1 new residents.

This supply lagging demand has led to heightened buyer competition and pricing pressures, with new dwellings valued at an average of $682,000, slightly above the regional norm, indicating a focus on quality developments. Commercial approvals this year totalled $7.4 million, reflecting the area's predominantly residential nature. Compared to Greater Sydney, Castle Hill - South has shown significantly reduced construction activity, 80.0% below the regional average per person, which typically strengthens demand and prices for existing properties. This activity is also below national averages, suggesting an established area with potential planning constraints. Building activity comprises 71.0% standalone homes and 29.0% attached dwellings, preserving Castle Hill - South's suburban character and attracting space-seeking buyers.

With around 948 people per approval, the area shows signs of maturity and establishment. By 2041, population forecasts predict an increase of 1,593 residents. If current development rates persist, housing supply may not keep pace with population growth, potentially intensifying buyer competition and supporting stronger price growth.

Castle Hill - South has very high levels of nearby infrastructure activity, ranking in the top 10% nationally

AreaSearch has identified 19 projects likely to impact the area, significantly influenced by changes in local infrastructure. Key projects include Hills Shire Council's Delivery Program and Operational Plan 2024-2025 Infrastructure Works, Chapman Gardens by CG Group, Castle Hill Panorama, and Hills Showground Village by Deicorp. The following list details those most relevant.

Professional plan users can use the search below to filter and access additional projects.

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Employment performance in Castle Hill - South has been broadly consistent with national averages

Castle Hill - South has a highly educated workforce with strong representation in professional services. The unemployment rate is 3.6%, lower than the Greater Sydney average of 4.2%.

Over the past year, employment growth was estimated at 2.1%. As of June 2025, 5925 residents are employed, with an unemployment rate of 3.0% and workforce participation at 63.8%. Leading industries include professional & technical services (27.4%), health care & social assistance (15.2%), and retail trade (12.5%).

Transport, postal & warehousing employs only 2.7% of local workers, compared to Greater Sydney's 5.3%. Between June 2024 and June 2025, employment levels increased by 2.1%, while the labour force grew by 3.1%, raising the unemployment rate by 0.9 percentage points. In contrast, Greater Sydney saw employment growth of 2.6% and an unemployment rate rise of 0.3 percentage points. Jobs and Skills Australia forecasts national employment growth of 6.6% over five years and 13.7% over ten years. Applying these projections to Castle Hill - South's employment mix suggests local growth of approximately 7.0% over five years and 14.1% over ten years.

Income metrics indicate excellent economic conditions, with the area achieving higher performance than 75% of national locations assessed by AreaSearch

Castle Hill - South has an extremely high national income level according to latest ATO data aggregated by AreaSearch for financial year 2022. The median income among taxpayers is $58,774 and average income stands at $86,729, compared to Greater Sydney's figures of $56,994 and $80,856 respectively. Based on Wage Price Index growth of 12.61% since financial year 2022, current estimates would be approximately $66,185 (median) and $97,666 (average) as of September 2025. Census 2021 income data shows household, family and personal incomes all rank highly in Castle Hill - South, between the 77th and 90th percentiles nationally. Distribution data shows the largest segment comprises 30.2% earning $1,500 - 2,999 weekly (3,258 residents), mirroring the broader area where 30.9% occupy this bracket. A significant 41.3% earn above $3,000 weekly. High housing costs consume 16.7% of income, though strong earnings still place disposable income at the 89th percentile and the area's SEIFA income ranking places it in the 9th decile.

Castle Hill - South is characterized by a predominantly suburban housing profile, with a higher proportion of rental properties than the broader region

In Castle Hill - South, as recorded in the latest Census, 70.9% of dwellings were houses with the remaining 29.0% being semi-detached, apartments, or other types. This compares to Sydney's metropolitan area which had 78.2% houses and 21.8% other dwellings. Home ownership in Castle Hill - South stood at 33.9%, with mortgaged dwellings at 36.0% and rented ones at 30.2%. The median monthly mortgage repayment was $3,000, aligning with Sydney's metro average, while the median weekly rent was $550 compared to Sydney's $3,000 and $580 respectively. Nationally, Castle Hill - South's mortgage repayments were significantly higher than the Australian average of $1,863, and rents were substantially above the national figure of $375.

Castle Hill - South features high concentrations of family households, with a lower-than-average median household size

Family households account for 83.9% of all households, including 46.1% couples with children, 26.5% couples without children, and 10.1% single parent families. Non-family households make up the remaining 16.1%, with lone person households at 14.0% and group households comprising 2.1% of the total. The median household size is 2.9 people, which is smaller than the Greater Sydney average of 3.0.

Castle Hill - South demonstrates exceptional educational outcomes, ranking among the top 5% of areas nationally based on AreaSearch's comprehensive analysis of qualification and performance metrics

Educational attainment in Castle Hill - South is notably high, with 47.8% of residents aged 15 and above holding university qualifications, compared to 30.4% nationally and 32.2% statewide (NSW). Bachelor degrees are the most common at 29.6%, followed by postgraduate qualifications at 15.0% and graduate diplomas at 3.2%. Vocational pathways account for 24.2% of qualifications, with advanced diplomas at 11.1% and certificates at 13.1%. Educational participation is high, with 31.5% of residents currently enrolled in formal education.

This includes 10.6% in primary education, 8.8% in secondary education, and 6.4% pursuing tertiary education. Castle Hill - South has three schools with a combined enrollment of 466 students. The area demonstrates significant socio-educational advantages and academic achievement, with an ICSEA score of 1135. Education provision is balanced with two primary and one secondary school serving distinct age groups. However, local school capacity is limited, with only 4.3 places per 100 residents compared to the regional average of 17.4, resulting in many families traveling to nearby areas for schooling.

Transport servicing is high compared to other areas nationally based on assessment of service frequency, route connectivity and accessibility

Castle Hill - South has 43 active public transport stops, all of which are bus stops. These stops are served by 79 different routes that together facilitate 4,254 weekly passenger trips. The area's transport accessibility is rated as excellent, with residents located an average of 163 meters from the nearest stop.

On average, there are 607 trips per day across all routes, which equals approximately 98 weekly trips per individual stop.

Castle Hill - South's residents boast exceedingly positive health performance metrics with very low prevalence of common health conditions across all age groups

Health outcomes data shows exceptional results for Castle Hill - South, with very low prevalence of common health conditions across all age groups. The area has a high rate of private health cover, at approximately 64% of its total population (6,883 people), compared to the national average of 55.3%.

The most prevalent medical conditions are arthritis and asthma, affecting 5.7% and 5.7% of residents respectively. A significant majority, 76.8%, report being completely free from medical ailments, compared to 75.9% across Greater Sydney. In terms of demographics, 18.7% of the population is aged 65 and over (2,015 people). Health outcomes among seniors are notably strong, aligning with the general population's health profile.

Castle Hill - South is among the most culturally diverse areas in the country based on AreaSearch assessment of a range of language and cultural background related metrics

Castle Hill-South has a high level of cultural diversity, with 45.4% speaking a language other than English at home and 46.7% born overseas. Christianity is the predominant religion, comprising 50.4%. Hinduism is overrepresented compared to Greater Sydney, making up 6.6% versus 8.6%.

The top three ancestry groups are English (16.5%), Chinese (16.3%), and Australian (15.7%). Korean (3.2%) and Indian (5.7%) are notably overrepresented, while Sri Lankan (0.7%) is slightly underrepresented compared to regional averages.

Castle Hill - South's population is slightly older than the national pattern

Castle Hill - South has a median age of 40, which is higher than Greater Sydney's figure of 37 and Australia's figure of 38. The 45-54 age cohort is notably over-represented in Castle Hill - South at 14.2%, while the 25-34 age group is under-represented at 9.0%. Between 2021 and the present, the 15 to 24 age group has grown from 11.9% to 13.8% of the population, and the 75 to 84 cohort has increased from 5.5% to 6.6%. Conversely, the 25 to 34 age group has declined from 10.2% to 9.0%, and the 5 to 14 age group has dropped from 14.8% to 13.7%. By 2041, demographic modeling suggests that Castle Hill - South's age profile will change significantly. The 85+ age cohort is projected to increase by 396 people (155%), from 255 to 652. Notably, the combined 65+ age groups are expected to account for 59% of total population growth, reflecting the area's aging demographic profile. Meanwhile, the 0 to 4 and 35 to 44 age cohorts are expected to experience population declines.