Castle Hill (NSW)

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

As of May 2026, the estimated population of Castle Hill (NSW) is around 43,390. This figure represents an increase of 2,516 people since the 2021 Census, which reported a population of 40,874. The current resident population estimate of 43,224 by AreaSearch, based on the latest ERP data release by the ABS (June 2025), and an additional 1,931 validated new addresses since the Census date, indicates a population density ratio of 2,301 persons per square kilometer. This rate is higher than the average seen across national locations assessed by AreaSearch. Castle Hill's growth rate of 6.2% since the 2021 census exceeds that of its SA3 area (5.3%), positioning it as a growth leader in the region. Overseas migration contributed approximately 97.0% of overall population gains during recent periods, driving this growth.

AreaSearch is using ABS/Geoscience Australia projections for each SA2 area, released in 2024 with 2022 as the base year. For areas not covered by this data, AreaSearch utilises NSW State Government's SA2 level projections released in 2022 with 2021 as the base year. Future population trends indicate a significant increase in the top quartile of statistical areas analysed by AreaSearch. By 2041, the suburb is forecasted to grow by 16,136 persons, reflecting an overall increase of 36.6% over the 16-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 allocated from statistical area data shows Castle Hill had approximately 793 new homes approved annually over the past five financial years, totalling around 3,969 homes. As of FY26987 approvals have been recorded. On average, 0.1 new residents per year arrived for each new home built between FY21 and FY25. This suggests that new construction is meeting or exceeding demand, providing more options for buyers while facilitating population growth.

The average value of new dwellings developed was $454,000, slightly above the regional average, indicating a focus on quality developments. In FY26, Castle Hill has seen $139.2 million in commercial approvals, demonstrating strong commercial development momentum. Compared to Greater Sydney, Castle Hill shows 104.0% higher new home approvals per person, offering greater choice for buyers and reflecting strong developer confidence in the area. The current building activity is composed of approximately 7.0% detached houses and 93.0% townhouses or apartments, marking a significant shift from the existing housing pattern of 74.0% houses. With around 43 people per dwelling approval, Castle Hill currently exhibits characteristics of a low-density area. According to AreaSearch's latest quarterly estimate, Castle Hill is projected to gain approximately 15,883 residents by 2041. With the current construction levels, housing supply should adequately meet demand, creating favourable conditions for buyers while potentially enabling growth that exceeds current forecasts.

Population forecasts indicate Castle Hill will gain 15,883 residents through to 2041 (from the latest AreaSearch quarterly estimate). With current construction levels, housing supply should adequately meet demand, creating favourable conditions for buyers while potentially enabling growth that exceeds current forecasts.

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

Changes in local infrastructure significantly impact an area's performance. AreaSearch identified 59 projects potentially influencing this region. Notable ones are Hills Showground Village by Deicorp, Hills Shire Council Infrastructure Delivery Program 2025-2026, Levande Hills Showground, and Castle Towers Expansion. 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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While Castle Hill retains a healthy unemployment rate of 4.0%, recent employment declines have impacted its national performance ranking

Castle Hill has a highly educated workforce with strong representation in professional services. The unemployment rate is 4.0%, as aggregated by AreaSearch from statistical area data. As of December 2025, 22,224 residents are employed, with an unemployment rate of 0.2% below Greater Sydney's rate of 4.2%.

Workforce participation stands at 64.1%, compared to Greater Sydney's 68.8%. According to Census responses, 54.3% of residents work from home, potentially influenced by Covid-19 lockdowns. The leading employment industries are health care & social assistance, professional & technical services, and education & training.

Conversely, transport, postal & warehousing has lower representation at 2.9% compared to the regional average of 5.3%. Many residents commute elsewhere for work, indicating local employment opportunities may not fully meet demand. Over the year to December 2025, labour force levels decreased by 0.1%, with employment down by 1.2%, leading to a 1.0 percentage point rise in unemployment rate. In contrast, Greater Sydney saw employment growth of 2.2% and labour force growth of 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's employment mix suggests local employment should increase by 7.1% over five years and 14.3% over ten years, though this is a simple weighting extrapolation for illustrative purposes 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

AreaSearch's latest postcode level ATO data for financial year 2023 shows that income in Castle Hill is among the highest in Australia. The median income is $59,533 and the average income stands at $87,988. This contrasts with Greater Sydney's figures of a median income of $60,817 and an average income of $83,003. Based on Wage Price Index growth of 10.32% since financial year 2023, current estimates would be approximately $65,677 (median) and $97,068 (average) as of March 2026. According to the 2021 Census figures, household incomes rank exceptionally at the 91st percentile ($2,551 weekly). Looking at income distribution, 29.2% of the population (12,669 individuals) fall within the $4000+ income range, contrasting with the metropolitan region where the $1,500 - 2,999 bracket leads at 30.9%. A significant 43.1% earn above $3,000 weekly. High housing costs consume 15.9% of income, though strong earnings still place disposable income at the 90th percentile and the area's SEIFA income ranking places 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 evaluated dwelling structures in Castle Hill as 73.8% houses and 26.2% other dwellings (semi-detached, apartments, 'other' dwellings), compared to Sydney metro's 55.9% houses and 44.1% other dwellings. Home ownership in Castle Hill was at 36.7%, with mortgaged dwellings at 39.2% and rented ones at 24.0%. The median monthly mortgage repayment in the area was $3,000, higher than Sydney metro's average of $2,427. The median weekly rent figure in Castle Hill was recorded at $560, compared to Sydney metro's $470. Nationally, Castle Hill's mortgage repayments were significantly higher than the Australian average of $1,863, while rents were substantially above the national figure of $375.

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

Family households account for 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 constitute 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, larger than the Greater Sydney average of 2.7.

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 residents aged 15 and above have a higher proportion of university qualifications at 47.0%, compared to the national average of 30.4% and the NSW average of 32.2%. This educational advantage is driven by bachelor degrees held by 29.3% of residents, followed by postgraduate qualifications (14.6%) and graduate diplomas (3.1%). Vocational pathways are also prevalent, with advanced diplomas held by 11.2% and certificates by 12.9%. Educational participation is notably high, with 31.6% currently enrolled in formal education, including 10.3% in primary, 9.6% in secondary, and 6.5% pursuing tertiary education.

Educational participation is notably high, with 31.6% of residents currently enrolled in formal education. This includes 10.3% in primary education, 9.6% in secondary education, and 6.5% pursuing tertiary education.

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 offering lightrail and bus services. These are served by 236 routes, providing 14,570 weekly passenger trips in total. Residents enjoy excellent transport accessibility, with an average distance of 170 meters to the nearest stop. Most residents commute outward from this primarily residential area. Car remains the dominant mode of transport at 82%, while train use stands at 8%. Vehicle ownership averages 1.5 per dwelling, higher than the regional average.

The 2021 Census reports that 54.3% of residents work from home, which may reflect COVID-19 conditions. Service frequency across all routes averages 2,081 trips per day, equating to approximately 48 weekly trips per stop. A map accompanies the data, displaying the 100 nearest stops to the location's centrepoint.

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

Castle Hill's health outcomes show excellent results according to AreaSearch's assessment of mortality rates and chronic condition prevalence. The area has a very low prevalence of common health conditions across all age groups.

Private health cover is exceptionally high at approximately 62% of the total population (26,745 people), higher than the national average of 55.7%. The most prevalent medical conditions are arthritis and asthma, affecting 6.4 and 5.8% of residents respectively. A significant majority, 75.2%, report being completely free from medical ailments, slightly higher than the Greater Sydney average of 74.6%. Castle Hill has a higher proportion of seniors aged 65 and over at 20.9% (9,068 people), compared to Greater Sydney's 15.5%. Health outcomes among seniors are generally strong, in line with national rankings for the general population.

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 predominant religion in Castle Hill, comprising 52.6% of its population. Hinduism is overrepresented compared to Greater Sydney, making up 6.6% of Castle Hill's population versus 5.2%.

The top three ancestry groups are English (17.2%), Chinese (16.2%), and Australian (15.6%). Notably, Korean (2.8%) and Sri Lankan (0.9%) ethnicities are overrepresented in Castle Hill compared to regional averages of 1.1% and 0.3%, respectively. Additionally, Indian ethnicity is also overrepresented at 5.9%.

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 years and Australia's average of 38 years. The 45-54 age group makes up 14.6% of the population in Castle Hill, compared to Greater Sydney's figure. Meanwhile, the 25-34 age group constitutes 8.2%. Post-2021 Census data shows that the 15-24 age group has grown from 12.5% to 14.6%, while the 75-84 cohort has increased from 6.2% to 7.4%. Conversely, the 5-14 age group has decreased from 14.5% to 13.1%. Population forecasts for 2041 indicate substantial demographic changes in Castle Hill. Notably, the 45-54 age group is expected to grow by 45%, adding 2,836 people and reaching a total of 9,171 from its current figure of 6,334.