Castle Hill (NSW)

Population growth drivers in Castle Hill are slightly above average based on AreaSearch's ranking of recent, and medium term trends

The Castle Hill (NSW) statistical area (Lv2) had an estimated population of 43,651 as of Nov 2025, reflecting a growth of 2,777 people since the 2021 Census. This increase represents a 6.8% rise from the previous population of 40,874. The change is inferred from AreaSearch's estimation of the resident population at 42,156 following examination of ABS's latest ERP data release in June 2024 and an additional 1,909 validated new addresses since the Census date. This results in a density ratio of 2,315 persons per square kilometer, exceeding the average seen across national locations assessed by AreaSearch. Castle Hill's growth rate since the 2021 census exceeded that of its SA3 area at 5.9%, positioning it as a growth leader in the region. Overseas migration contributed approximately 97.0% of overall population gains during recent periods, driving primary growth for the area.

AreaSearch adopts ABS/Geoscience Australia projections for each SA2 area released in 2024 with a base year of 2022. For areas not covered by this data, AreaSearch utilises NSW State Government's SA2 level projections 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. Future population trends forecast a significant increase, with the area expected to grow by 17,316 persons to 2041 based on aggregated SA2-level projections, reflecting an overall increase of 36.1% over the 17-year period.

AreaSearch assessment of residential development activity positions Castle Hill among the top 25% of areas assessed nationwide

AreaSearch analysis of ABS building approval numbers in Castle Hill shows approximately 793 new homes approved annually over the past five financial years, totalling an estimated 3,969 homes. As of FY26691 approvals have been recorded. On average, 0.1 new residents per year arrive per new home between FY21 and FY25, indicating supply meeting or exceeding demand. The average value of new dwellings is $454,000.

This financial year has seen $139.2 million in commercial approvals, reflecting high local commercial activity. Compared to Greater Sydney, Castle Hill exhibits 104.0% higher development activity per person. New building activity comprises 7.0% detached dwellings and 93.0% attached dwellings, marking a shift from the current 74.0% houses. With approximately 43 people per approval, Castle Hill is considered a developing area. By 2041, AreaSearch estimates an increase of 15,761 residents. Given current development patterns, new housing supply should meet demand, presenting favourable conditions for buyers and potentially facilitating population growth beyond projections.

Looking ahead, Castle Hill is expected to grow by 15,761 residents through to 2041 (from the latest AreaSearch quarterly estimate). Based on current development patterns, new housing supply should readily meet demand, offering good conditions for buyers and potentially facilitating population growth beyond current projections.

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

Local infrastructure changes significantly influence an area's performance. AreaSearch identified 63 projects potentially impacting the region. Notable initiatives include Hills Shire Council's Delivery Program and Operational Plan 2024-2025 Infrastructure Works, Castle Hill Panorama, Castle Towers Expansion, and Hills Showground East Precinct. 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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The labour market in Castle Hill demonstrates typical performance when compared to similar areas across Australia

Castle Hill has a highly educated workforce with strong representation in professional services. Its unemployment rate is 3.5%, lower than Greater Sydney's 4.2%.

Employment stability has been relative over the past year. As of September 2025, 22,360 residents are employed, with an unemployment rate at 0.6% below Greater Sydney's and workforce participation similar to Greater Sydney's 60.0%. Leading employment industries are health care & social assistance, professional & technical, and education & training.

Transport, postal & warehousing is under-represented, at 2.9% compared to Greater Sydney's 5.3%. Local employment opportunities exist, but many residents commute elsewhere for work based on Census data. From September 2024 to September 2025, employment levels increased by 0.4%, labour force by 1.0%, and unemployment rose by 0.6 percentage points in Castle Hill. In contrast, Greater Sydney experienced employment growth of 2.1% and labour force growth of 2.4%, with a 0.2 percentage point rise in unemployment. As of 25-Nov-25, NSW employment contracted by 0.03%, losing 2,260 jobs, with the state unemployment rate at 3.9%. National employment forecasts from May-25 suggest national employment will expand by 6.6% over five years and 14.3% over ten years. Applying these projections to Castle Hill's employment mix suggests local employment should increase by 7.1% over five years and 14.3% over ten years, assuming constant population projections for illustrative purposes.

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

The suburb of Castle Hill had one of the highest income levels in Australia according to AreaSearch data based on ATO figures for financial year 2023. The median income among taxpayers was $59,533 and the average income stood at $87,988. This compares with Greater Sydney's median income of $60,817 and average income of $83,003. By September 2025, based on an 8.86% increase in wages since financial year 2023, estimated incomes would be approximately $64,808 (median) and $95,784 (average). Castle Hill's household incomes ranked at the 91st percentile with a weekly income of $2,551. The largest income segment comprised 29.2% earning over $4,000 weekly, contrasting with Greater Sydney where the $1,500 - $2,999 bracket led at 30.9%. A substantial proportion (43.1%) earned above $3,000 weekly, indicating strong economic capacity in the area. High housing costs consumed 15.9% of income, but strong earnings placed disposable income at the 90th percentile. The suburb's SEIFA income ranking placed it in the 9th decile.

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

The latest Census data shows that Castle Hill's dwelling structure was 73.8% houses and 26.2% other dwellings (semi-detached, apartments, 'other' dwellings), compared to Sydney metro's 73.8% houses and 21.8% other dwellings. Home ownership in Castle Hill stood at 36.7%, with mortgaged dwellings at 39.2% and rented dwellings at 24.0%. The median monthly mortgage repayment was $3,000, aligning with Sydney metro's average. The median weekly rent was $560, compared to Sydney metro's $580. Nationally, Castle Hill's mortgage repayments were higher than the Australian average of $1,863, and rents were substantially above the national figure of $375.

Castle Hill features high concentrations of family households, with a fairly typical median household size

Family households constitute 82.8% of all households, including 48.0% couples with children, 24.9% couples without children, and 9.0% single parent families. Non-family households account for the remaining 17.2%, with lone person households at 15.9% and group households comprising 1.3%. The median household size is 3.0 people, which aligns with the Greater Sydney average.

Educational achievement in Castle Hill places it within the top 10% nationally, reflecting strong academic performance and high qualification levels across the community

Castle Hill's educational attainment exceeds broader benchmarks significantly. Among residents aged 15+, 47.0% hold university qualifications compared to Australia's 30.4% and NSW's 32.2%. This is particularly notable for bachelor degrees at 29.3%, followed by postgraduate qualifications at 14.6% and graduate diplomas at 3.1%. Vocational pathways account for 24.1% of qualifications among those aged 15+, with advanced diplomas at 11.2% and certificates at 12.9%.

Educational participation is high, with 31.6% currently enrolled in formal education. This includes primary education (10.3%), secondary education (9.6%), and tertiary education (6.5%).

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

Castle Hill has 298 active public transport stops, a mix of lightrail and buses. These stops are served by 236 routes, offering 14,570 weekly passenger trips in total. Residents enjoy excellent transport accessibility, with an average distance of 170 meters to the nearest stop.

Daily service frequency averages 2,081 trips across all routes, translating to approximately 48 weekly trips per individual stop.

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

Castle Hill demonstrates exceptional health outcomes across all age groups, with a very low prevalence of common health conditions. The private health cover rate stands at approximately 62%, comprising 26,906 people, compared to Greater Sydney's 64.4% and the national average of 55.7%. Arthritis and asthma are the most prevalent medical conditions in the area, affecting 6.4% and 5.8% of residents respectively.

A total of 75.2% of residents declare themselves completely clear of medical ailments, compared to Greater Sydney's 75.9%. Castle Hill has a higher proportion of seniors aged 65 and over, at 20.5% or 8,948 people, compared to Greater Sydney's 18.9%. Senior health outcomes align with the general population's health profile in the area.

Castle Hill 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 has a high level of cultural diversity, with 43.8% of its population speaking a language other than English at home and 45.4% born overseas. Christianity is the main religion in Castle Hill, comprising 52.6% of the population. However, Hinduism is overrepresented compared to Greater Sydney, making up 6.6% of Castle Hill's population versus 8.6%.

The top three ancestry groups are English (17.2%), Chinese (16.2%), and Australian (15.6%). Some ethnic groups show notable differences: Korean is overrepresented at 2.8%, Sri Lankan at 0.9%, and Indian at 5.9% compared to regional percentages.

Castle Hill's median age exceeds the national pattern

The median age in Castle Hill is 42 years, which is significantly higher than Greater Sydney's average of 37 and Australia's average of 38 years. The 45-54 age group constitutes 14.5% of the population in Castle Hill, compared to a lower percentage for the 25-34 cohort at 8.0%. According to data from the 2021 Census, the 15-24 age group has increased from 12.5% to 14.2%, while the 5-14 age group has decreased from 14.5% to 13.7%. Population forecasts for the year 2041 suggest substantial demographic changes in Castle Hill, with the 45-54 age group expected to grow by 46% (adding approximately 2,900 people), reaching a total of 9,230 from its current figure of 6,329.