Castle Hill - South

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 11,020 as of May 2026. This figure represents an increase of 601 people since the 2021 Census, which reported a population of 10,419. The increase was inferred from the estimated resident population of 10,965 in June 2025 and 37 validated new addresses since the Census date. This results in a population density of 2,668 persons per square kilometer, placing Castle Hill - South in the upper quartile relative to national locations assessed by AreaSearch. The area's growth rate of 5.8% since the 2021 census surpassed the SA3 area's growth rate of 5.3%, indicating it as a growth leader in the region. Overseas migration contributed approximately 83.0% of overall population gains during recent periods, driving the primary demographic trend.

AreaSearch adopted ABS/Geoscience Australia projections for each SA2 area released in 2024 with 2022 as the base year. For areas not covered by this data, NSW State Government's SA2 level projections released in 2022 with 2021 as the base year were utilized. Growth rates by age group from these aggregations are applied to all areas for years 2032 to 2041. Looking ahead, Castle Hill - South is projected to have above median population growth, with an expected increase of 1,503 persons to 2041 based on the latest annual ERP population numbers, reflecting a total gain of 13.1% over the 16-year period.

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. Between the financial years FY-21 and FY-25, a total of 99 homes were approved, with an additional 13 approved in FY-26 to date. On average, over these five years, each dwelling constructed has attracted around 4.1 new residents yearly.

This supply lagging behind demand suggests heightened buyer competition and pricing pressures. The average construction value of new dwellings is $508,000, indicating developers target the premium market segment with higher-end properties. In FY-26, there have been $7.4 million in commercial approvals, reflecting the area's primarily residential nature. Compared to Greater Sydney and nationally, Castle Hill - South shows significantly reduced construction activity, at 80.0% below the regional average per person and below national averages, likely due to its maturity and possible planning constraints. The new building activity comprises 71.0% standalone homes and 29.0% attached dwellings, preserving the area's suburban nature with an emphasis on detached housing attracting space-seeking buyers.

With around 948 people per approval, Castle Hill - South is a mature, established area. Population forecasts estimate it will gain 1,448 residents by 2041. If current development rates persist, housing supply may struggle to keep pace with population growth, potentially intensifying buyer competition and supporting stronger price growth.

Castle Hill - South has emerging levels of nearby infrastructure activity, ranking in the 35thth percentile nationally

Changes to local infrastructure significantly impact an area's performance. AreaSearch identified 20 projects expected to affect the area. Notable projects include Hills Shire Council Infrastructure Delivery Program from 2025 to 2026, Sydney Metro Northwest, Hills Showground Village by Deicorp, and Chapman Gardens by CG Group. 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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Castle Hill - South has seen below average employment performance when compared to national benchmarks

Castle Hill - South has a highly educated workforce with professional services being strongly represented. The unemployment rate in December 2025 was 4.2%, matching Greater Sydney's rate. Out of the total population, 5,839 residents were employed.

Census data showed that 54.2% of residents worked from home, potentially influenced by Covid-19 lockdowns. Key employment industries include professional & technical services (27.6%), health care & social assistance (18.3%), and retail trade (10.4%). Transport, postal & warehousing employs only 2.7% of local workers, lower than Greater Sydney's 5.3%.

The area appears to have limited local employment opportunities based on Census data comparing working population to resident population. Between December 2024 and December 2025, the labour force decreased by 0.1%, while employment dropped by 1.6%, leading to a 1.4 percentage point rise in unemployment rate. In contrast, Greater Sydney saw employment grow by 2.2% and labour force increase by 2.3%. Jobs and Skills Australia's national employment forecasts from May-25 project overall 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 employment should increase by 7.0% over five years and 14.1% over ten years, though this is a simplified extrapolation for illustrative purposes only and does not account for localised population projections.

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

The Castle Hill - South SA2 has an exceptionally high national income level according to recent Australian Taxation Office data aggregated by AreaSearch for financial year 2023. The median income among taxpayers in this area is $61,883, while the average income stands at $87,123. These figures compare with those of Greater Sydney's median income of $60,817 and average income of $83,003 respectively. Based on Wage Price Index growth of 10.32% since financial year 2023, estimated incomes as of March 2026 would be approximately $68,269 (median) and $96,114 (average). Census data from 2021 shows that household, family, and personal incomes in Castle Hill - South all rank highly nationally, between the 76th and 90th percentiles. Income distribution indicates that 30.2% of residents earn between $1,500 and $2,999 weekly, with a total of 3,328 individuals in this income bracket. Notably, 41.3% of residents earn above $3,000 weekly, reflecting areas of prosperity that contribute to robust local economic activity. Despite high housing costs consuming 16.7% of income, strong earnings place disposable income at the 88th percentile nationally. The area's SEIFA income ranking places it in the 9th decile.

Castle Hill - South is characterized by a predominantly suburban housing profile, with above-average rates of outright home ownership

In Castle Hill - South, as recorded in the latest Census, 70.9% of dwellings were houses, with the remaining 29.0% comprising semi-detached homes, apartments, and other types. This distribution differed from Sydney's metropolitan area, where 55.9% of dwellings were houses and 44.1% were other types. Home ownership in Castle Hill - South stood at 33.9%, with mortgaged properties at 36.0% and rented dwellings at 30.2%. The median monthly mortgage repayment in the area was $3,000, exceeding Sydney's average of $2,427. Weekly rent in Castle Hill - South was $550, compared to Sydney's $470. Nationally, mortgage repayments averaged $1,863 and rents were $375.

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

Family households account for 83.9% of all households, consisting of 46.1% couples with children, 26.5% couples without children, and 10.1% single parent families. Non-family households constitute 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 larger than the Greater Sydney average of 2.7.

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 higher than broader benchmarks. As of the latest data, 47.8% of residents aged 15 years and over hold university qualifications, compared to 30.4% nationally and 32.2% statewide (NSW). The area's educational advantage is reflected in its strong showing for knowledge-based opportunities. 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 among those aged 15 years and over, 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.

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

Castle Hill - South has 46 active public transport stops, all of which are bus stops. These stops are served by 81 different routes, collectively facilitating 5,806 weekly passenger trips. The area's transport accessibility is rated as excellent, with residents typically residing 163 meters from the nearest stop. Most residents commute outward due to its residential nature. Cars remain the primary mode of transportation at 80%, followed by trains at 9% and buses at 5%. On average, there are 1.4 vehicles per dwelling, higher than the regional average.

According to the 2021 Census, 54.2% of residents work from home, potentially due to COVID-19 conditions. Service frequency averages 829 trips daily across all routes, equating to approximately 126 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

AreaSearch's health outcomes assessment for Castle Hill - South shows exceptional results. Mortality rates and chronic condition prevalence were very low across all age groups. Private health cover was found to be high at approximately 63% of the total population (6,975 people), compared to 59.9% in Greater Sydney and a national average of 55.7%.

The most prevalent medical conditions were arthritis and asthma, affecting 5.7 and 5.7% of residents respectively. 76.8% of residents declared themselves completely clear of medical ailments, higher than the 74.6% in Greater Sydney. As of 2021, 19.0% of residents were aged 65 and over (2,088 people), higher than the 15.5% in Greater Sydney. Health outcomes among seniors were strong, broadly in line with national rankings for the general population.

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% of its population speaking a language other than English at home and 46.7% born overseas. Christianity is the predominant religion in Castle Hill-South, comprising 50.4% of the population. Hinduism is overrepresented compared to Greater Sydney, making up 6.6% of Castle Hill-South's population versus 5.2%.

The top three ancestry groups are English (16.5%), Chinese (16.3%), and Australian (15.7%). Notably, Korean (3.2%) and Sri Lankan (0.7%) ethnicities are overrepresented in Castle Hill-South compared to the regional averages of 1.1% and 0.3%, respectively. Indian ethnicity is also higher at 5.7%.

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 years. The 45-54 cohort is notably over-represented at 14.5% locally compared to the Greater Sydney average, while the 25-34 age group is under-represented at 9.3%. Between January 2021 and present, the 15-24 age group has increased from 11.9% to 14.3%, and the 75-84 cohort has grown from 5.5% to 6.7%. Conversely, the 5-14 age group has declined from 14.8% to 13.0%, and the 35-44 age group has dropped from 16.1% to 15.0%. By 2041, demographic modeling suggests that Castle Hill - South's age profile will significantly evolve. The 85+ age cohort is projected to surge dramatically, expanding by 370 people (130%) from 284 to 655. 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 0-4 and 35-44 cohorts are expected to experience population declines.