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

According to investigations by AreaSearch, Castle Hill - South has a population of approximately 11,020 as of May 2026. This indicates a growth of 601 residents (5.8%) from the 2021 Census, which counted 10,419 individuals. This adjustment is calculated using the ABS estimated resident population of 10,965 from June 2025 alongside 37 validated new addresses identified after the Census. Such population levels translate to a density of 2,668 persons per square kilometer, placing the locality in the top quartile of all Australian areas analyzed by AreaSearch. The 5.8% expansion rate of Castle Hill - South since the 2021 census outpaced the broader SA3 region (5.3%), making it a leader in local population expansion. This growth was mostly fueled by net overseas migration, which comprised roughly 83.0% of the total population rise in recent times.

AreaSearch utilizes population projections from the ABS and Geoscience Australia for individual SA2 regions, published in 2024 with a 2022 baseline. In instances where SA2 areas lack this coverage, projections from the NSW State Government released in 2022 with a 2021 baseline are applied. Expected growth rates by age group from these combined sources are also extended to all locations for the years 2032 to 2041. Future demographic projections point to population growth exceeding the national median, with the locality anticipated to add 1,503 residents by 2041 based on the most recent annual ERP statistics, representing a cumulative increase of 13.1% over the 16-year timeframe.

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 averages approximately 19 residential building approvals annually, with a total of 99 dwellings approved over the last 5 financial years. In the current FY-26 period, 20 approvals have been documented. Since an average of 4.9 additional residents per built dwelling have relocated to the area over the previous 5 financial years (from FY-21 to FY-25), demand is outstripping new housing additions, a trend that generally drives up property prices and heightens buyer rivalry. Concurrently, newly built houses average a construction value of $508,000, showing that developers are focusing on the higher-end market with premium housing options. Furthermore, commercial building approvals have reached $7.4 million this financial year, showing a subdued focus on business infrastructure construction.

When compared to Greater Sydney, Castle Hill - South exhibits low building volumes, running 80.0% below the regional average per capita. This low rate of new construction typically bolsters demand and prices for established housing. Activity is also lower than the national benchmark, reflecting a mature market and highlighting potential planning or space constraints. Recent construction activity is composed of 71.0% separate houses and 29.0% medium and high-density dwellings, preserving a suburban character that emphasizes larger family residences for buyers wanting extra space. With approximately 965 residents for every single approved dwelling, Castle Hill - South represents a highly established market.

Projecting forward, Castle Hill - South is anticipated to add 1,448 residents by 2041, according to the latest quarterly figures from AreaSearch. If current building rates persist, the addition of new housing may fall short of population gains, which could intensify competition among buyers and foster stronger price growth.

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

Changes to infrastructure, major construction projects, and planning policies are key drivers of local performance. AreaSearch has identified 20 projects with the potential to influence the local area. Key developments include the Hills Shire Council Infrastructure Delivery Program 2025-2026, Sydney Metro Northwest, Deicorp's Hills Showground Village, and CG Group's Chapman Gardens, with the most significant projects listed below.

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

Denotes AI-based impression for illustrative purposes only, not to be taken as definitive under any circumstances. Please follow links and conduct other investigations from the project's source for actual imagery. Developers and project owners wishing us to use original imagery please Contact Us and we will do so.

While Castle Hill - South retains a healthy unemployment rate of 3.8%, recent employment declines have impacted its national performance ranking

The workforce in Castle Hill - South is highly qualified, with professional services representing a major share of employment, and an unemployment rate standing at just 3.8%. In March 2026, there were 5,871 employed local residents, and the unemployment rate sat 0.3% below the Greater Sydney average of 4.1%. Workforce participation is mostly aligned with the Greater Sydney level of 69.1%. Census responses indicate that a significant 54.2% of the working population operated from home, though this figure may reflect the influence of pandemic lockdowns.

The most common employment fields for residents are professional & technical services, health care & social assistance, and retail trade. Conversely, transport, postal & warehousing represents a small share of the local workforce at only 2.7%, compared to 5.3% across Greater Sydney. This predominantly residential locality appears to provide a limited number of local jobs, as shown by comparing the count of the Census working population against the resident population.

Based on AreaSearch's evaluation of SALM and ABS statistics, the local labor force shrank by 0.2% and total employment fell by 0.7% over the 12 months ending March 2026, leading to a rise in unemployment of 0.5 percentage points. By comparison, Greater Sydney saw employment rise by 1.9% and its labor force grow by 1.9%, accompanied by a minor decrease. National employment projections from May-25 by Jobs and Skills Australia provide further context regarding future demand in Castle Hill - South. These five and ten-year forecasts have been correlated with the local workforce structure to project future trends. Although total national employment is projected to grow by 6.6% over five years and 13.7% over ten years, the expected growth rates vary widely by industry. Applying these sectoral projections to the employment composition of Castle Hill - South indicates local employment could rise by 7.0% over five years and 14.1% over ten years, representing a basic weighted extrapolation for comparison that does not incorporate local population forecasts.

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

Income levels in the Castle Hill - South SA2 are positioned at the upper end of the national spectrum, according to aggregated ATO statistics from AreaSearch for the 2023 financial year. Taxpayers in Castle Hill - South SA2 have a median income of $61,883 and an average income of $87,123, compared to $60,817 and $83,003 in Greater Sydney, respectively. Factoring in Wage Price Index growth of 10.32% since the 2023 financial year, current figures would be approximately $68,269 for the median and $96,114 for the average as of March 2026. According to the Census, household, family, and individual incomes in Castle Hill - South are high, falling in the 76th to 90th national percentiles. The largest income bracket contains 30.2% of residents earning between $1,500 and $2,999 weekly (3,328 people), closely matching the Greater Sydney rate of 30.9%. Economic capacity is highlighted by the 41.3% of households earning more than $3,000 per week, which helps sustain high consumer demand. Residential costs consume 16.7% of local incomes, but strong earnings keep disposable income in the 88th percentile, and the SEIFA index ranks the area in the 9th decile for income.

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

According to the most recent Census, the housing stock in Castle Hill - South consists of 70.9% separate houses and 29.0% alternative housing types (including semi-detached properties, apartments, and other dwellings), compared to the metropolitan Sydney split of 55.9% separate houses and 44.1% alternative dwellings. Home ownership in Castle Hill - South is notably higher than the Sydney metro rate, standing at 33.9%, while the remaining properties are either under mortgage (36.0%) or occupied by renters (30.2%). The median monthly mortgage payment of $3,000 was higher than the Sydney metro average of $2,427, and the median weekly rent was recorded at $550, compared to the metro average of $470. On a national scale, Castle Hill - South's mortgage costs are higher than the Australian average of $1,863, and weekly rents exceed the national benchmark of $375.

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

Families make up the vast majority of households at 83.9%, consisting of 46.1% couples with children, 26.5% couples without children, and 10.1% single parents. The remaining 16.1% are non-family households, which include lone person households at 14.0% and group housing arrangements at 2.1%. The average household size stands at 2.9 individuals, 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

The level of education in Castle Hill - South is high compared to broader averages, with 47.8% of residents aged 15 and over holding a university degree, compared to 30.4% nationally and 32.2% across NSW. This educational trend prepares the local population for employment in information-driven industries. Bachelor degrees are the most common qualification at 29.6%, followed by postgraduate degrees at 15.0% and graduate diplomas at 3.2%. Technical and vocational credentials represent 24.2% of qualifications for those aged 15 and over, split between advanced diplomas (11.1%) and certificate qualifications (13.1%).

A high share of the population is engaged in study, with 31.5% of residents enrolled in an educational program. This includes 10.6% attending primary schools, 8.8% in secondary institutions, and 6.4% enrolled in higher education.

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

Public transport analysis identifies 46 transit stops within Castle Hill - South, consisting of bus services. These stops are served by 81 different routes, which together provide 5,806 passenger trips each week. Transport access is rated highly, with the average distance to the closest stop being 163 meters. As a residential community, the majority of working residents travel out of the area for employment, with cars being the main transport mode for 80% of commuters, followed by trains at 9% and buses at 5%. Households own an average of 1.4 vehicles, which is higher than the regional average. A high proportion of residents, 54.2%, worked from home according to the 2021 Census, which may have been influenced by pandemic conditions.

Service frequency averages 829 daily trips across all routes, which corresponds to roughly 126 weekly trips per transit 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 metrics for Castle Hill - South reveal positive outcomes based on AreaSearch's evaluation of mortality data and the incidence of chronic illnesses, showing a low presence of common health issues across all demographics. The proportion of residents with private health insurance is high, encompassing roughly 63% of the population (6,975 residents). This compares to private insurance rates of 59.9% in Greater Sydney and a national average of 55.7%.

The most frequently reported medical conditions in the locality are arthritis and asthma, which affect 5.7% and 5.7% of the population respectively, whereas 76.8% of residents reported having no chronic medical conditions, compared to 74.6% in Greater Sydney. Residents aged 65 and over make up 19.0% of the population (2,088 individuals), which is higher than the Greater Sydney proportion of 15.5%. The health status of these older residents is strong, with national rankings aligning closely with the general public.

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 shows a high level of cultural diversity, with 45.4% of residents speaking a language other than English at home and 46.7% born outside Australia. Christianity is the primary religion, representing 50.4% of the local population. The most prominent religious overrepresentation is Hinduism, which is practiced by 6.6% of residents compared to 5.2% across Greater Sydney.

Looking at ancestral origins, the three largest groups in Castle Hill - South are English at 16.5%, Chinese at 16.3% (which is higher than the regional average of 8.4%), and Australian at 15.7%. There is also a higher representation of certain other background groups compared to the wider region, with Korean ancestry accounting for 3.2% of Castle Hill - South (compared to 1.1% regionally), Sri Lankan ancestry at 0.7% (compared to 0.3%), and Indian ancestry at 5.7% (compared to 3.6%).

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

The median age in Castle Hill - South is 40 years, which is slightly higher than the Greater Sydney median of 37 and the national median of 38. Compared to the Greater Sydney distribution, the 45 - 54 age group has a larger presence locally (14.5%), while 25 - 34 year-olds have a smaller representation (9.3%). Since 2021, the cohort aged 15 to 24 grew from 11.9% to 14.3% of the total, and the 75 to 84 cohort rose from 5.5% to 6.7%. In contrast, the 5 to 14 cohort decreased from 14.8% to 13.0%, and the 35 to 44 age bracket fell from 16.1% to 15.0%. Demographic models indicate that Castle Hill - South's age distribution will change by 2041. The group aged 85 and over is expected to grow, increasing by 370 people (130%) from 284 to 655. Cumulatively, the cohorts aged 65 and over are projected to represent 59% of all population growth, showing an aging population trend. Conversely, the 0 to 4 and 35 to 44 cohorts are projected to decrease in size.