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

As of February 2026, Castle Hill - South's population is approximately 10,926. This figure represents an increase of 507 people since the 2021 Census, which recorded a population of 10,419. The growth from June 2024's estimated resident population of 10,787 and an additional 25 validated new addresses is inferred. This results in a population density ratio of 2,645 persons per square kilometer, placing Castle Hill - South in the upper quartile nationally according to AreaSearch assessments. Over the past decade, Castle Hill - South has shown resilient growth 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 uses ABS/Geoscience Australia projections for each SA2 area released in 2024, with a base year of 2022. For areas not covered by this data, NSW State Government's SA2 level projections released in 2022 with a base year of 2021 are 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 1,595 persons by 2041 based on the latest annual ERP population numbers. This reflects a total gain of 13.3% 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 each year. Between FY21 and FY25, a total of 99 homes were approved, with an additional 9 approved so far in FY26. On average, over the past five financial years, 4.1 new residents have arrived per dwelling constructed annually.

This indicates that supply is lagging behind demand, which typically leads to heightened buyer competition and pricing pressures. The average construction value of new dwellings is $508,000, suggesting developers are targeting the premium market segment with higher-end properties. In FY26, there have been $7.4 million in commercial approvals, reflecting the area's primarily residential nature. Compared to Greater Sydney, Castle Hill - South shows significantly reduced construction activity, at 80.0% below the regional average per person. This scarcity of new homes often strengthens demand and prices for existing properties.

Nationally, this activity is also below average, indicating the area's maturity and possible planning constraints. New building activity consists of approximately 71.0% standalone homes and 29.0% attached dwellings, preserving Castle Hill - South's suburban nature and attracting space-seeking buyers. With around 948 people per approval, the area demonstrates characteristics of a mature, established community. According to AreaSearch's latest quarterly estimate, Castle Hill - South is projected to gain 1,456 residents by 2041. If current development rates persist, housing supply may not keep pace with population growth, potentially increasing buyer competition and supporting stronger price growth.

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

AreaSearch has identified 19 infrastructure projects that could impact the area. Key projects include Hills Shire Council's Delivery Program and Operational Plan 2024-2025 Infrastructure Works, Castle Hill Panorama, Sydney Metro Northwest, and Castle Hill Showground Revitalisation. The following list details those most likely to be 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 an educated workforce with professional services well represented. Its unemployment rate was 3.7% in September 2025, 0.5% below Greater Sydney's rate of 4.2%. Workforce participation was similar to Greater Sydney's at 70.0%.

A high proportion of residents, 54.2%, worked from home according to Census responses. Leading employment industries were professional & technical, health care & social assistance, and retail trade. Transport, postal & warehousing employed only 2.7% of local workers compared to Greater Sydney's 5.3%.

Employment opportunities locally appeared limited due to the predominantly residential nature of the area. Between September 2024 and September 2025, employment levels increased by 0.1%, labour force grew by 1.0%, causing unemployment to rise by 0.8 percentage points. In contrast, Greater Sydney saw employment grow by 2.1% and labour force by 2.4%. Jobs and Skills Australia's national employment forecasts from May-25 project a 6.6% increase over five years and 13.7% over ten years nationally. Applying these projections to Castle Hill - South's employment mix suggests local employment could grow by 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

The Castle Hill - South SA2 has an exceptionally high national income level according to AreaSearch's aggregation of latest ATO data for financial year 2023. The median income among taxpayers is $61,883, with the average income standing at $87,123. These figures compare to Greater Sydney's median and average incomes of $60,817 and $83,003 respectively. Based on Wage Price Index growth of 8.86% from financial year 2023 to September 2025, estimated current incomes are approximately $67,366 (median) and $94,842 (average). Census 2021 income data shows Castle Hill - South's household, family, and personal incomes rank highly nationally, between the 76th and 90th percentiles. Income distribution reveals that 30.2% of residents earn between $1,500 and $2,999 weekly, mirroring the broader area where 30.9% fall into this bracket. Notably, 41.3% earn above $3,000 weekly, indicating prosperity and robust local economic activity. High housing costs consume 16.7% of income, but 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

Castle Hill - South's dwelling structure, as per the latest Census, had 70.9% houses and 29.0% other dwellings (semi-detached, apartments, 'other' dwellings), contrasting with Sydney metro's 55.9% houses and 44.1% 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, surpassing Sydney metro's average of $2,427. The median weekly rent figure in Castle Hill - South was $550, higher than Sydney metro's $470. 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 higher-than-average median household size

Family households constitute 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 account for the remaining 16.1%, with lone person households at 14.0% and group households comprising 2.1%. 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 high, with 47.8% of residents aged 15 and above holding university qualifications as of the latest data. This compares to national figures of 30.4% for Australia and 32.2% for New South Wales (NSW). Bachelor degrees are most prevalent 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 and above, 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 as of the latest figures. 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 that together facilitate 5,806 weekly passenger trips. The area's transport accessibility is rated as excellent, with residents typically living just 163 meters from the nearest stop. Most residents commute outside the area, with cars being the primary mode of transport at 80%. Train use stands at 9%, and bus use 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, which may be influenced by COVID-19 conditions. Across all routes, service frequency averages 829 trips per day, equating to approximately 126 weekly trips per 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 assessment shows Castle Hill - South has excellent health outcomes. Mortality rates and chronic condition prevalence are very low across all age groups. Private health cover is exceptionally high at 63%, compared to Greater Sydney's 59.9% and the national average of 55.7%.

The most common conditions are arthritis (5.7%) and asthma (5.7%). 76.8% of residents report no medical ailments, higher than Greater Sydney's 74.6%. Castle Hill - South has a larger senior population at 19.2%, compared to Greater Sydney's 15.4%. Health outcomes among seniors are strong and align with national rankings.

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 cultural diversity, with 45.4% of its population speaking a language other than English at home and 46.7% born overseas. Christianity is the main religion in Castle Hill - South, comprising 50.4% of its population. Hinduism is overrepresented compared to Greater Sydney, making up 6.6% versus 5.2%.

The top three represented 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 compared to the regional averages of 1.1% and 0.3%, respectively.

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 marginally higher than Australia's median age of 38 years. The 45-54 cohort is notably over-represented in Castle Hill - South at 14.4%, compared to the Greater Sydney average. Conversely, the 25-34 year-olds are under-represented at 8.6%. Between 2021 and present, the 15-24 age group has grown from 11.9% to 14.2% of the population, while the 75-84 cohort increased from 5.5% to 6.9%. During this period, the 25-34 cohort declined from 10.2% to 8.6%, and the 5-14 group dropped from 14.8% to 13.5%. By 2041, demographic modeling suggests significant changes in Castle Hill - South's age profile. The 85+ age cohort is projected to surge dramatically, expanding by 369 people (130%) from 282 to 652. Notably, the combined 65+ age groups are expected to account for 60% 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.