Mount Colah

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

Mount Colah's population is estimated at around 8,726 as of Feb 2026. This reflects an increase of 910 people since the 2021 Census, which reported a population of 7,816 people. The change is inferred from AreaSearch's estimate of the resident population at 8,314 following examination of ABS ERP data release in June 2024 and an additional 35 validated new addresses since the Census date. This level of population equates to a density ratio of 789 persons per square kilometer. Mount Colah's growth rate of 11.6% since the 2021 census exceeded the SA4 region's 5.8%, marking it as a growth leader in the area. Overseas migration contributed approximately 56% of overall population gains during recent periods.

AreaSearch is adopting ABS/Geoscience Australia projections for Mount Colah, released in 2024 with 2022 as the base year. For future population dynamics, an above median growth is projected, with the suburb expected to grow by 1,153 persons to 2041 based on aggregated SA2-level projections, reflecting an increase of 8% over the 17 years.

Recent residential development output has been above average within Mount Colah when compared nationally

Based on AreaSearch analysis of ABS building approval numbers, allocated from statistical area data, Mount Colah has recorded around 27 residential properties granted approval per year. Between FY-21 and FY-25, approximately 139 homes were approved, with an additional 4 so far in FY-26. On average, this results in about 5.6 new residents per year for every home built over the past five financial years.

This demand outpaces supply, putting upward pressure on prices and increasing competition among buyers. The average construction value of new properties is $428,000, indicating an emphasis on quality construction, which is moderately above regional levels. In FY-26, $15.2 million in commercial approvals have been registered, indicating steady commercial investment activity. Compared to Greater Sydney, Mount Colah has slightly more development, with 29.0% above the regional average per person over the five-year period. This maintains good buyer choice while supporting existing property values. However, building activity has slowed in recent years, which is similarly under the national average, indicating the area's established nature and suggesting potential planning limitations.

Recent construction comprises 48.0% standalone homes and 52.0% medium and high-density housing. This shift from the area's existing housing (currently 84.0% houses) indicates decreasing availability of developable sites and reflects changing lifestyles, with a need for more diverse, affordable housing options. The estimated count of 390 people in the area per dwelling approval reflects its quiet, low activity development environment. Future projections show Mount Colah adding 702 residents by 2041, based on 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.

Mount Colah has strong levels of nearby infrastructure activity, ranking in the top 30% nationally

Changes to local infrastructure significantly influence an area's performance. AreaSearch has identified five projects likely impacting the area. Key projects are Hornsby Park's transformation from quarry to parklands, Mount Colah Station Upgrade, Arlington Heights Estate, and Berowra Valley National Park Northern Extension. The following details those most relevant.

Professional plan users can use the search below to filter and access additional projects.

Denotes AI-based impression for illustrative purposes only, not to be taken as definitive under any circumstances. Please follow links and conduct other investigations from the project's source for actual imagery. Developers and project owners wishing us to use original imagery please Contact Us and we will do so.

Mount Colah shows employment indicators that trail behind approximately 70% of regions assessed across Australia

Mount Colah has a highly educated workforce with the technology sector being particularly prominent. Its unemployment rate is 7.6%, according to AreaSearch's aggregation of statistical area data. As of September 2025, there are 4,528 residents employed, and the unemployment rate is 3.4% higher than Greater Sydney's rate of 4.2%.

Workforce participation in Mount Colah stands at 72.3%, slightly above Greater Sydney's 70.0%. Census responses indicate that 47.3% of residents work from home; however, Covid-19 lockdown impacts should be considered when interpreting this figure. The dominant employment sectors among residents are health care & social assistance, education & training, and professional & technical services. Notably, the concentration in education & training is high, with employment levels at 1.4 times the regional average.

Conversely, transport, postal & warehousing employs just 3.4% of local workers, lower than Greater Sydney's 5.3%. The area appears to offer limited employment opportunities locally, as indicated by the difference between the Census working population and resident population. Between September 2024 and September 2025, Mount Colah's labour force increased by 0.7% while employment declined by 2.4%, resulting in a rise of 2.9 percentage points in the unemployment rate. In contrast, Greater Sydney saw employment rise by 2.1%, with the labour force growing by 2.4% and unemployment increasing by just 0.2 percentage points during the same period. Jobs and Skills Australia's national employment forecasts from May-25 can provide further insight into potential future demand within Mount Colah. Applying these projections to Mount Colah's employment mix suggests that local employment should increase by 7.1% over five years and 14.5% over ten years, based on a simple weighting extrapolation for illustrative purposes and not accounting for localized population projections.

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

AreaSearch's aggregation of ATO data for financial year 2023 shows Mount Colah had a median taxpayer income of $60,214 and an average income of $76,842. Nationally, these figures are high, with Greater Sydney averages being $60,817 and $83,003 respectively. By September 2025, adjusted for Wage Price Index growth of 8.86%, median income is estimated at $65,549 and average income at $83,650. Census 2021 data ranks Mount Colah's household, family, and personal incomes between the 81st and 90th percentiles nationally. Income distribution shows that 31.6% of residents (2,757 people) earn between $1,500 and $2,999 weekly, similar to the regional average of 30.9%. Mount Colah's affluence is evident with 41.0% earning over $3,000 per week. Housing accounts for 15.1% of income, with residents ranking in the 90th percentile for disposable income. The area's SEIFA income ranking places it in the 9th decile.

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

Mount Colah's dwelling structures, as per the latest Census, consisted of 83.8% houses and 16.2% other dwellings (semi-detached, apartments, 'other' dwellings), compared to Sydney metro's 55.9% houses and 44.1% other dwellings. Home ownership in Mount Colah was at 33.6%, with mortgaged dwellings at 48.7% and rented ones at 17.6%. The median monthly mortgage repayment in the area was $2,544, exceeding Sydney metro's average of $2,427. The median weekly rent figure in Mount Colah was $525, compared to Sydney metro's $470. Nationally, Mount Colah's mortgage repayments were significantly higher than the Australian average of $1,863, while rents were substantially above the national figure of $375.

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

Family households account for 83.2% of all households, including 47.4% couples with children, 25.0% couples without children, and 9.7% single parent families. Non-family households constitute the remaining 16.8%, with lone person households at 15.4% and group households comprising 1.5%. The median household size is 2.9 people, which is larger than the Greater Sydney average of 2.7.

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

The area's university qualification rate is 39.9%, significantly lower than the SA4 region average of 57.1%. This disparity presents both a challenge and an opportunity for targeted educational initiatives. Bachelor degrees are the most common at 26.0%, followed by postgraduate qualifications (10.2%) and graduate diplomas (3.7%). Vocational credentials are also prevalent, with 30.6% of residents aged 15+ holding such qualifications – advanced diplomas account for 12.1% and certificates for 18.5%.

Educational participation is high, with 30.2% of residents currently enrolled in formal education. This includes 9.8% in primary education, 8.9% in secondary education, and 5.5% pursuing tertiary education.

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

Mount Colah has 82 active public transport stops, offering a mix of train and bus services. These stops are served by 24 individual routes, collectively facilitating 2,170 weekly passenger trips. Transport accessibility is rated excellent, with residents typically located 149 meters from the nearest stop. Most residents commute outward due to Mount Colah's primarily residential nature. Car remains the dominant mode of transport at 83%, while train usage stands at 11%. Vehicle ownership averages 1.5 per dwelling, exceeding the regional average.

According to the 2021 Census, a high 47.3% of residents work from home, which may reflect COVID-19 conditions. Service frequency averages 310 trips per day across all routes, equating to approximately 26 weekly trips per individual stop.

Mount Colah's residents are extremely healthy with very low prevalence of common health conditions across all age groups

Analysis of health metrics shows strong performance throughout Mount Colah. AreaSearch's assessment indicates very low prevalence of common health conditions across all age groups.

The rate of private health cover is found to be very high at approximately 57% of the total population (around 4,998 people), compared to 59.9% across Greater Sydney. The most common medical conditions in the area are asthma and mental health issues, impacting 8.2 and 7.1% of residents respectively. Meanwhile, 72.2% of residents declare themselves completely clear of medical ailments, compared to 74.6% across Greater Sydney. The under-65 population demonstrates better than average health outcomes. The area has 16.0% of residents aged 65 and over (1,396 people). Health outcomes among seniors are particularly strong, with national rankings broadly in line with the general population.

Mount Colah 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

Mount Colah, surveyed in July-August 2016, showed higher cultural diversity than most local areas. It had 33.3% of its population born overseas and 26.2% speaking a language other than English at home. Christianity was the dominant religion, at 48.3%.

Judaism's representation was 0.4%, slightly above Greater Sydney's 0.8%. For ancestry, Mount Colah had high percentages for English (24.6%), Australian (23.2%), and Other (12.1%), all higher than regional averages. Notable ethnic group divergences included Hungarian at 0.5% (vs regional 0.3%), Russian at 0.5% (vs 0.4%), and Korean at 0.8% (vs 1.1%).

Mount Colah's population is slightly older than the national pattern

Mount Colah has a median age of 40, which is slightly higher than Greater Sydney's figure of 37 and Australia's average of 38 years. The 45-54 age cohort is notably over-represented in Mount Colah at 16.5%, compared to the Greater Sydney average, while the 25-34 year-olds are under-represented at 8.5%. Between 2021 and present, the 15 to 24 age group has increased from 12.1% to 13.5% of the population, and the 75 to 84 cohort has risen from 4.3% to 5.7%. Conversely, the 25 to 34 cohort has declined from 10.7% to 8.5%, and the 0 to 4 age group has dropped from 5.9% to 4.8%. By 2041, demographic modeling suggests Mount Colah's age profile will change significantly. The 55 to 64 age cohort is projected to expand by 239 people (21%) from 1,143 to 1,383. Notably, the combined 65+ age groups are expected to account for 63% of total population growth, reflecting the area's aging demographic profile. Meanwhile, the 15 to 24 and 25 to 34 cohorts are anticipated to experience population declines.