Castle Cove

Castle Cove is positioned among the lower quartile of areas assessed nationally for population growth based on AreaSearch's assessment of recent, and medium term trends

As of May 2026, the estimated population of the suburb of Castle Cove is around 2,661, based on analysis of ABS population updates and new addresses validated by AreaSearch. This reflects an increase of 18 people since the 2021 Census, which reported a population of 2,643. The change is inferred from the resident population of 2,656 estimated by AreaSearch following examination of the latest ERP data release by the ABS in June 2025 and an additional 14 validated new addresses since the Census date. This level of population equates to a density ratio of 1,137 persons per square kilometer, which is relatively in line with averages seen across locations assessed by AreaSearch. Overseas migration was the primary driver of population growth for the area during recent periods.

AreaSearch is adopting ABS/Geoscience Australia projections for each SA2 area, released in 2024 with a base year of 2022, and NSW State Government's SA2 level projections for areas not covered by this data, 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. Over this period, projections indicate an overall population decline of 24 persons by 2041. However, specific age cohorts are expected to grow, notably the 85 and over age group, projected to increase by 112 people.

AreaSearch assessment of residential development drivers sees a low level of activity in Castle Cove, placing the area among the bottom 25% of areas assessed nationally

AreaSearch analysis of ABS building approval numbers for Castle Cove shows an average of around 14 new dwelling approvals annually. Between FY-21 and FY-25, approximately 72 homes were approved, with a further 22 approved so far in FY-26. Despite population decline during this period, development activity has been adequate relative to the falling population, which is positive for buyers.

The average expected construction cost value of new homes is $1,352,000, indicating that developers are focusing on the premium market with high-end developments. This year, there have been $508,000 in commercial development approvals, reflecting the area's residential nature. Comparatively, Castle Cove shows 14.0% lower construction activity per person relative to Greater Sydney and ranks among the 43rd percentile of areas assessed nationally. This suggests somewhat limited buyer options but strengthens demand for established properties. New developments consist of 50.0% detached dwellings and 50.0% townhouses or apartments, marking a significant shift from the current housing pattern of 91.0% houses.

This trend may indicate diminishing developable land availability and responds to evolving lifestyle preferences and housing affordability needs. The location has approximately 381 people per dwelling approval, reflecting an established area with population projections showing stability or decline. Consequently, Castle Cove is expected to see reduced housing demand pressures, benefiting potential buyers.

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

No factors affect a region's performance more than alterations to local infrastructure, major projects, and planning initiatives. AreaSearch has pinpointed 0 projects that could significantly impact this area. Notable projects include Heart Of Willoughby, Beaches Link Tunnel, Northern Beaches Housing Reforms Implementation, and North Sydney To Northern Beaches Capacity Improvements, as detailed below for relevance.

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AreaSearch assessment positions Castle Cove ahead of most Australian regions for employment performance

Castle Cove's workforce is highly educated, with the technology sector prominent. Its unemployment rate was 3.1% in December 2025, lower than Greater Sydney's 4.2%. Employment stability has been maintained over the past year.

As of December 2025, 1,263 residents were employed, with an unemployment rate 1.1% below Greater Sydney's rate. Workforce participation was 59.2%, significantly lower than Greater Sydney's 68.8%. Sixty-one percent of residents worked from home, potentially influenced by Covid-19 lockdowns. Leading employment industries were professional & technical, finance & insurance, and health care & social assistance.

Professional & technical jobs were particularly concentrated, at 1.9 times the regional average, while public administration & safety employed only 2.4% of local workers, below Greater Sydney's 5.7%. The area offers limited local employment opportunities, indicated by its Census working population vs resident population count. Between December 2024 and December 2025, employment levels increased by 0.2%, labour force by 0.6%, leading to a unemployment rise of 0.4 percentage points. In contrast, Greater Sydney experienced employment growth of 2.2% and labour force growth of 2.3%. National employment forecasts from Jobs and Skills Australia, released in May-25, project national employment growth of 6.6% over five years and 13.7% over ten years. Applying these projections to Castle Cove's employment mix suggests local employment should increase by 7.5% over five years and 14.8% over ten years, though these are simple extrapolations for illustrative purposes only.

The economic profile demonstrates exceptional strength, placing the area among the top 10% nationally based on comprehensive AreaSearch income analysis

AreaSearch's latest postcode level ATO data released for financial year 2023 shows Castle Cove's median income among taxpayers is $68,783. The average income in the suburb is $162,075. Nationally, these figures are exceptionally high compared to Greater Sydney's median of $60,817 and average of $83,003. As of March 2026, estimates based on Wage Price Index growth suggest a median income of approximately $75,881 and an average of $178,801 in Castle Cove. According to the 2021 Census, incomes in Castle Cove rank highly nationally, between the 92nd and 99th percentiles for household, family, and personal incomes. The income distribution shows that 42.3% of residents (1,125 people) fall into the $4000+ bracket, contrasting with regional levels where the $1,500 - 2,999 bracket leads at 30.9%. Economic strength is evident in Castle Cove, with 54.6% of households achieving high weekly earnings exceeding $3,000, supporting elevated consumer spending. After housing costs, residents retain 86.9% of their income, reflecting strong purchasing power. The area's SEIFA income ranking places it in the 10th decile.

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

The dwelling structure in Castle Cove, as per the latest Census, consisted of 90.6% houses and 9.4% other dwellings (semi-detached, apartments, 'other' dwellings), compared to Sydney metro's 55.9% houses and 44.1% other dwellings. Home ownership in Castle Cove stood at 52.1%, with mortgaged dwellings at 35.9% and rented ones at 12.0%. The median monthly mortgage repayment was $4,000, higher than Sydney metro's average of $2,427. The median weekly rent figure in Castle Cove was $1,000, compared to Sydney metro's $470. Nationally, Castle Cove's mortgage repayments were significantly higher than the Australian average of $1,863, while rents were substantially above the national figure of $375.

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

Family households constitute 83.5 percent of all households, including 48.7 percent couples with children, 26.0 percent couples without children, and 7.9 percent single parent families. Non-family households comprise the remaining 16.5 percent, with lone person households at 15.6 percent and group households making up 1.4 percent of the total. The median household size is 2.9 people, larger than the Greater Sydney average of 2.7.

Castle Cove demonstrates exceptional educational outcomes, ranking among the top 5% of areas nationally based on AreaSearch's comprehensive analysis of qualification and performance metrics

Castle Cove's educational attainment is notably higher than national averages. Among residents aged 15 and above, 53.8% possess university qualifications, compared to Australia's 30.4% and New South Wales' 32.2%. This high level of educational attainment positions the area favourably for knowledge-based opportunities. Bachelor degrees are the most common at 34.0%, followed by postgraduate qualifications (15.9%) and graduate diplomas (3.9%).

Vocational pathways account for 20.3% of qualifications, with advanced diplomas making up 11.3% and certificates 9.0%. Educational participation is high, with 33.5% of residents currently enrolled in formal education. This includes 11.5% in primary education, 11.0% 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 Cove has 31 active public transport stops, all of which are bus stops. These stops are served by 27 different routes that together facilitate 2,580 weekly passenger trips. The area's transport accessibility is rated as excellent, with residents on average living just 171 meters from the nearest stop. As a mainly residential zone, most Castle Cove residents commute outwards, predominantly by car (86%). Walking accounts for 4% of journeys. On average, there are 1.7 vehicles per dwelling in Castle Cove, exceeding the regional norm.

According to the 2021 Census, 61% of residents work from home, which may be influenced by COVID-19 conditions. Across all routes, an average of 368 trips are made daily, equating to roughly 83 weekly trips per individual stop.

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

Castle Cove's health outcomes show excellent results according to AreaSearch's assessment. Mortality rates and chronic condition prevalence are very low across all age groups. Private health cover is exceptionally high at approximately 91% of the total population (2,411 people), compared to Greater Sydney's 59.9% and the national average of 55.7%.

The most common medical conditions are arthritis and asthma, affecting 7.0 and 6.3% of residents respectively. 75.1% of residents declare themselves completely clear of medical ailments, slightly higher than Greater Sydney's 74.6%. Castle Cove has 25.1% of residents aged 65 and over (667 people), higher than Greater Sydney's 15.5%. Health outcomes among seniors are strong and align with national rankings for the general population.

Castle Cove was found to be more culturally diverse than the vast majority of local markets in Australia, upon assessment of a range of language and cultural background related metrics

Castle Cove has a high level of cultural diversity, with 30.5% speaking a language other than English at home and 38.7% born overseas. Christianity is the predominant religion in Castle Cove, comprising 52.1%. Notably, Judaism is overrepresented at 2.3%, compared to 0.8% across Greater Sydney.

The top three ancestral groups are English (21.7%), Australian (18.6%), and Chinese (17.4%), the latter being significantly higher than the regional average of 8.4%. Hungarian, Russian, and French ethnicities also show notable overrepresentation in Castle Cove compared to the region at large: Hungarian at 1.0% vs 0.3%, Russian at 0.6% vs 0.4%, and French at 0.8% vs 0.5%.

Castle Cove hosts an older demographic, ranking in the top quartile nationwide

The median age in Castle Cove is 46 years, notably higher than Greater Sydney's average of 37 years and also above Australia's median age of 38 years. Compared to Greater Sydney, the 75-84 age cohort is significantly over-represented in Castle Cove at 10.2%, while the 25-34 age group is under-represented at 5.4%. Between the 2021 Census and present, the 75 to 84 age group has increased from 8.1% to 10.2% of Castle Cove's population. Conversely, the 5 to 14 age cohort has decreased from 16.4% to 14.0%, and the 35 to 44 age group has dropped from 11.1% to 9.9%. Population forecasts for 2041 indicate substantial demographic changes in Castle Cove, with the 85+ age cohort projected to grow significantly by 105 people (97%) from 109 to 215. The aging population trend is clear, as those aged 65 and above are expected to comprise 89% of the projected growth. Conversely, the 35 to 44 and 0 to 4 age cohorts are anticipated to experience population declines.