Castlecrag (NSW)

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Evaluating demographic updates from the ABS for the surrounding region alongside fresh addresses confirmed by Districts post-census indicates that the suburb of Castlecrag has an estimated residency of 3,189 individuals as of May 2026. Compared to the 2021 Census, which counted 2,965 residents, this represents an addition of 224 people, or a rise of 7.6%. This estimate builds on a base population of 3,186 calculated by Districts using the ABS June 2025 release of ERP figures, coupled with 3 newly validated addresses registered after the census. Such population volume translates to a density of 2,111 persons per square kilometer, a level that ranks above the typical density observed across national sites tracked by Districts. The suburb of Castlecrag outpaced the wider SA4 region's growth rate of 5.9% as well as the state overall, establishing itself as a regional pacesetter. This expansion was almost entirely underpinned by arrival of overseas migrants, who acted as the sole source of positive population movements lately.

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A highly qualified labor force characterizes the suburb of Castlecrag, with the tech industry showing strong representation. The local jobless rate stands at 3.1%, while estimated employment grew by 3.9% over the past year, according to Districts compilation of regional metrics. As of March 2026, working residents numbered 1,742, representing an unemployment rate 1.0% lower than the Greater Sydney mark of 4.1%. Workforce engagement trails regional levels, with participation at 65.9% compared to 69.1% across Greater Sydney. Census data indicates that 65.0% of local workers performed their duties from home, though this figure was likely influenced by pandemic restrictions.

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Data compiled by Districts from postcode-level ATO records for financial year 2023 shows that taxpayers in the suburb of Castlecrag recorded a median income of $81,592 and an average income of $192,257. These figures sit in the highest national percentiles and compare to $60,817 and $83,003 for Greater Sydney. Factoring in Wage Price Index growth of 10.32% since financial year 2023, current estimates for March 2026 point to a median of $90,012 and an average of $212,098. In the 2021 Census, household, family, and individual earnings in the suburb of Castlecrag fell between the 97th and 99th percentiles nationwide. The highest income category of $4000+ per week accounts for 56.8% of the local population, or 1,811 residents, whereas the - range is the most common in the wider region at . High affluence is evident, with of the community earning more than weekly, which underpins demand for high-end shops and services. Disposable income after housing costs is high, with residents keeping of their earnings, and the area is positioned in the th decile of the SEIFA index.

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The residential landscape in the suburb of Castlecrag at the time of the latest Census consisted of 96.7% separate houses and 3.3% other formats like townhouses, apartments, or alternative dwellings, contrasting with the Sydney metropolitan breakdown of 55.9% houses and 44.1% other dwellings. Home ownership rates in the suburb of Castlecrag reached 49.1%, outstripping metropolitan levels, while mortgaged properties accounted for 39.0% and rented properties made up 11.9%. The median monthly mortgage payment of $4,333 was significantly higher than the metropolitan median of $2,427. Similarly, the median weekly rental cost was $1,010 compared to the regional median of $470. Globally, mortgage costs in the suburb of Castlecrag are well above the national median of $1,863, and rent prices are substantially higher than the Australian median of $375.

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Household composition is dominated by families at 88.5%, which includes 51.3% couples with children, 28.1% couples without children, and 8.3% single parent households. The remaining 11.5% consists of non-family living arrangements, where single-person households account for 11.1% and group houses represent 0.6%. The typical household size of 3.0 persons is larger than the Greater Sydney median of 2.7.

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Academic credentials in the suburb of Castlecrag are highly elevated compared to wider averages, with 59.8% of residents aged 15+ holding a university degree, compared to national levels of 30.4% and state levels of 32.2%. This educational profile positions the suburb well for knowledge-sector positions. Bachelor level degrees are the most common qualification at 37.9%, followed by postgraduate study at 17.9% and graduate diplomas at 4.0%. Vocational training accounts for 13.6% of educational achievements for those aged 15+, consisting of advanced diplomas at 7.9% and certificates at 5.7%.

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Analysis of transit facilities shows 19 active bus stops located in the suburb of Castlecrag. These stops connect to 29 separate routes, which collectively deliver 1,231 passenger journeys each week. Local access to transport is rated as excellent, with typical residences situated 187 meters from the nearest stop. Because of the area's residential profile, most workers travel out of the suburb, with private cars serving as the primary transit mode at 85%, followed by buses at 6%. Household vehicle ownership averages 1.7 cars, which is higher than the metropolitan average. A high proportion of residents, 65.0%, reported working from home in the 2021 Census, which may have been influenced by pandemic conditions.

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Public health metrics reveal positive outcomes in the suburb of Castlecrag, based on Districts assessments of mortality patterns and chronic illnesses, showing low rates of standard health conditions across all ages. Private health insurance coverage is exceptionally high, encompassing roughly 102% of the local population, or 3,266 people. This rate stands in contrast to the 59.9% coverage measured across Greater Sydney and the national baseline of 55.7%.

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Cultural diversity in the suburb of Castlecrag is higher than in most surrounding residential markets, with 19.3% of residents speaking a non-English language in their homes and 32.6% born outside Australia. Christianity is the primary religion, representing 49.2% of the local community. The most distinct religious overrepresentation is seen in Judaism, which is practiced by 2.6% of residents compared to 0.8% across Greater Sydney.

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The median age of 46 years in the suburb of Castlecrag is higher than the Greater Sydney median of 37 and the national average of 38. The 15 - 24 demographic shows high representation at 23.5% locally, while young adults aged 25 - 34 are less represented at 4.6%. The percentage of residents aged 15 - 24 is higher than the national rate of 12.7%. Since the 2021 Census, the median age has decreased by 1.4 years, moving from 47 down to 46. Specifically, the 15 to 24 age bracket rose from 15.9% to 23.5% of the total population, and the 75 to 84 cohort grew from to . In contrast, the to cohort decreased from to , and the to cohort fell from to . Projections for point to shifts in the age structure of the suburb of Castlecrag, with the to group expected to grow by people, or , climbing from to . Conversely, both the to and to age cohorts are expected to decrease in size.

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Castlecrag currently has an estimated 70 children under 5 years old, comprising approximately 56 children aged 0-2 and 36 children aged 3-4. This cohort declined by an estimated 28% since the previous census. while population forecasts indicate future decline, with an anticipated decrease of 6% by 2041 (to approximately 66 children). Meanwhile the 5-12 cohort currently amounts to 346. Birth rates in the area have averaged 4.2 per 1,000 residents over the latest two-year period, a low rate (among the bottom 20% of areas assessed nationally). This rate has slowed down slightly in recent years however.