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 November 2025, Castle Hill - South's population is approximately 10,818, indicating a growth of 399 people since the 2021 Census. This increase represents a 3.8% rise from the previously recorded population of 10,419. The change can be attributed to an estimated resident population of 10,787 in June 2024 and the validation of 25 new addresses since the Census date. This results in a population density ratio of 2,619 persons per square kilometer, placing Castle Hill - South in the upper quartile compared to other locations assessed by AreaSearch. Over the past decade, ending in June 2024, Castle Hill - South has shown consistent growth with a compound annual growth rate of 1.1%, outperforming its SA3 area. Overseas migration contributed significantly to this growth, accounting for approximately 79.9% of overall population gains during recent periods.

AreaSearch's projections for each SA2 area are based on ABS/Geoscience Australia data 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 used. Growth rates by age group from these aggregations are applied to all areas for the years 2032 to 2041. According to population projections, Castle Hill - South is expected to experience above median growth, with an anticipated increase of 1,595 persons by 2041, reflecting a total gain of 14.5% over the 17-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 FY-21 and FY-25, 99 homes were approved, with a further 5 approved in FY-26 to date. On average, 4.1 new residents per year have been arriving per dwelling constructed over the past five financial years.

This indicates that supply is lagging behind demand, leading 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 FY-26, there have been $7.4 million in commercial approvals, reflecting the area's primarily residential nature. Compared to Greater Sydney, Castle Hill - South shows substantially reduced construction activity, at 80.0% below the regional average per person. This scarcity of new homes typically 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 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. Castle Hill - South has around 948 people per approval, suggesting a mature, established area. According to AreaSearch quarterly estimates, the area is forecasted to gain 1,564 residents by 2041. If current development rates continue, housing supply may not keep pace with population growth, potentially increasing buyer competition and supporting stronger price growth.

Castle Hill - South has strong levels of nearby infrastructure activity, ranking in the top 30% nationally

Changes to local infrastructure significantly influence an area's performance. AreaSearch identified 19 projects likely impacting the area. Notable projects include Castle Hill Panorama, Castle Hill Showground Revitalisation, Cecil & Roger Mixed-Use Development, and Castle Grange. 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 professional services being notably represented. Its unemployment rate was 3.7% in the past year, lower than Greater Sydney's 4.2%.

As of September 2025, 5887 residents are employed, with an unemployment rate of 3.2%, slightly below Greater Sydney's rate. Workforce participation is at 63.8%, similar to Greater Sydney's 60.0%. Key employment industries include professional & technical services (41.2%), health care & social assistance (15.7%), and retail trade (10.9%).

Transport, postal & warehousing employs only 2.7% of local workers, lower than Greater Sydney's 5.3%. Between September 2024 and September 2025, employment levels increased by 0.1%, labour force grew by 1.0%, leading to a rise in unemployment rate by 0.8 percentage points. In comparison, Greater Sydney saw employment growth of 2.1% and an unemployment increase of 0.2 percentage points. As of 25-Nov-25, NSW employment contracted by 0.03% (losing 2260 jobs), with the state unemployment rate at 3.9%, lower than the national rate of 4.3%. National employment forecasts from May-25 suggest a 6.6% increase over five years and 13.7% over ten years. Applying these projections to Castle Hill - South's employment mix indicates local employment should grow by 7.0% in five years and 14.1% in ten years, assuming constant 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 had an extremely high national income level according to AreaSearch aggregated ATO data for financial year 2022. The median income among taxpayers was $58,774 and the average income stood at $86,729. These figures compared to Greater Sydney's of $56,994 and $80,856 respectively. Based on a 12.61% Wage Price Index growth 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 ranked highly in Castle Hill - South, between the 76th and 90th percentiles nationally. Distribution data showed the largest segment comprised 30.2% earning $1,500 - $2,999 weekly (3,267 residents), mirroring the broader area where 30.9% occupied this bracket. A significant 41.3% earned above $3,000 weekly. High housing costs consumed 16.7% of income, but strong earnings placed disposable income at the 88th percentile and the area's SEIFA income ranking placed 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

The dwelling structure in Castle Hill - South, as recorded at the latest Census, consisted of 70.9% houses and 29.0% other dwellings (semi-detached, apartments, 'other' dwellings), compared to Sydney metro's 70.9% houses and 29.1% 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, aligning with the Sydney metro average, while the median weekly rent was $550, compared to Sydney metro's $3,000 and $580 respectively. Nationally, Castle Hill - South's mortgage repayments were significantly higher than the Australian average of $1,863, with rents 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%. 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 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% across NSW. The area's educational advantage is evident with bachelor degrees being 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 in the area, with 31.5% of residents currently enrolled in formal education, including 10.6% in primary education, 8.8% in secondary education, and 6.4% pursuing tertiary education.

Transport servicing is good 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 excellent, with residents living an average of 163 meters from the nearest stop.

On average, there are 607 trips per day across all routes, which amounts to 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 impressive results in Castle Hill - South, with very low prevalence of common health conditions across all age groups. The rate of private health cover is exceptionally high at approximately 64% of the total population (6,901 people), compared to the national average of 55.3%.

The most common medical conditions are arthritis and asthma, affecting 5.7% and 5.7% of residents respectively. A significant majority, 76.8%, report being completely clear of medical ailments, slightly higher than the Greater Sydney average of 75.9%. As of 2021, 18.7% of residents are aged 65 and over (2,020 people). Health outcomes among seniors align broadly with those of the general population in the area.

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 high cultural diversity, with 45.4% speaking a language other than English at home and 46.7% born overseas. Christianity is the main religion, comprising 50.4%. Hinduism is overrepresented at 6.6%, compared to Greater Sydney's 8.6%.

Top ancestry groups are English (16.5%), Chinese (16.3%), and Australian (15.7%). Korean (3.2%) and Sri Lankan (0.7%) populations are notably higher than regional averages, while Indian is lower at 5.7% compared to Greater Sydney's 7.5%.

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

Castle Hill - South has a median age of 40, which is slightly higher than Greater Sydney's figure of 37 years and Australia's median age of 38 years. The 45-54 age cohort is notably over-represented in Castle Hill - South at 14.2%, compared to the Greater Sydney average, while the 25-34 age group is under-represented at 9.0%. Between 2021 and present, the 15 to 24 age group has increased from 11.9% to 13.8% of the population, and the 75 to 84 cohort has grown 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 decreased 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 dramatically by 154%, from 256 to 652 people. 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 projected to experience population declines.