Mount Colah

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

As of Feb 2026, the estimated population of Mount Colah is around 8,726, reflecting an increase of 910 people since the 2021 Census. This growth represents a 11.6% rise from the previous population count of 7,816. The change was inferred from AreaSearch's estimation of the resident population at 8,314 following examination of the latest ERP data release by the ABS in June 2024, along with an additional 35 validated new addresses since the Census date. This results in a population density ratio of 789 persons per square kilometer, comparable to averages seen across other locations assessed by AreaSearch. Mount Colah's growth rate exceeded that of its SA4 region (5.8%) and SA3 area, marking it as a growth leader in the region. Overseas migration contributed approximately 56% of overall population gains during recent periods.

AreaSearch adopts 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. Growth rates by age group from these aggregations are applied to all areas for years 2032 to 2041. Based on aggregated SA2-level projections, Mount Colah is expected to increase its population by 1,180 persons to 2041, reflecting an overall increase of 8.8% over the 17-year period. This projection aligns with demographic trends showing above median population growth for statistical areas analysed by AreaSearch.

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

Mount Colah experienced approximately 27 dwelling approvals annually over the past five financial years, totalling around 138 homes. In FY-26 so far, there have been 5 recorded approvals. On average, about 5.8 people moved to the area per year for each dwelling built between FY-21 and FY-25. This suggests supply is lagging demand, leading to potential buyer competition and pricing pressures.

New homes are being constructed at an average cost of $428,000, which is higher than regional norms due to quality-focused development. In the current financial year, around $15.2 million in commercial approvals have been registered, indicating balanced commercial development activity. Compared to Greater Sydney, Mount Colah shows moderately higher construction activity at 26.0% above the regional average per person over the past five years. However, construction activity has eased recently and is lower than the national average, reflecting market maturity and possible development constraints. The new building activity consists of approximately 48.0% detached houses and 52.0% townhouses or apartments, marking a significant shift from the current housing pattern of 84.0% houses. The estimated population growth in Mount Colah is expected to be around 768 residents by 2041, according to AreaSearch's latest quarterly estimate.

The existing development levels appear aligned with future requirements, maintaining stable market conditions without significant price pressures.

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. Notable projects include Hornsby Park's transformation from quarry to parklands, Mount Colah Station Upgrade, Arlington Heights Estate development, and Berowra Valley National Park Northern Extension. The following list 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.

AreaSearch analysis reveals Mount Colah recording weaker employment conditions than most comparable areas nationwide

Mount Colah's workforce is highly educated, with the technology sector prominently represented. The unemployment rate was 6.9% as of December 2025. Over the past year, employment remained relatively stable.

Residents' unemployment rate was 2.7% higher than Greater Sydney's rate of 4.2%, while workforce participation was similar at 70.2%. Notably, 47.3% of residents worked from home, potentially influenced by Covid-19 lockdowns. Dominant employment sectors include health care & social assistance, education & training, and professional & technical services. The area specializes in education & training, with an employment share 1.4 times the regional level.

Conversely, transport, postal & warehousing is under-represented at 3.4% compared to Greater Sydney's 5.3%. Local employment opportunities appear limited, as indicated by the working population vs resident population count. Between December 2024 and December 2025, Mount Colah's labour force increased by 1.2%, while employment declined by 0.4%, leading to a 1.5 percentage point rise in unemployment rate. In contrast, Greater Sydney saw employment grow by 2.2% and labour force expand by 2.3%. Jobs and Skills Australia forecasts national employment growth of 6.6% over five years and 13.7% over ten years. Applying these projections to Mount Colah's employment mix suggests local employment should increase by 7.1% over five years and 14.5% over ten years, though this is a simplified extrapolation for illustrative purposes only.

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

Mount Colah suburb has a median taxpayer income of $60,214 and an average of $76,842 based on latest postcode level ATO data aggregated by AreaSearch for financial year 2023. This is higher than national averages, which are $60,817 (median) and $83,003 (average). By September 2025, estimated incomes would be approximately $65,549 (median) and $83,650 (average), considering an 8.86% Wage Price Index growth since financial year 2023. Mount Colah's household, family, and personal incomes rank high nationally, between the 81st and 90th percentiles according to Census 2021 income data. In Mount Colah, 31.6% of individuals earn within the $1,500 - $2,999 weekly range, similar to the broader area at 30.9%. Higher earners are prominent with 41.0% exceeding $3,000 weekly. Housing costs account for 15.1% of income, and residents rank high in disposable income (90th percentile) and SEIFA income ranking (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, higher than Sydney metro's average of $2,427. The median weekly rent figure for 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, and 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, consisting of 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 making up 1.5%. The median household size is 2.9 people, 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%. Bachelor degrees are the most common at 26.0%, followed by postgraduate qualifications (10.2%) and graduate diplomas (3.7%). Vocational credentials are prevalent, with 30.6% of residents aged 15+ holding them, including advanced diplomas (12.1%) and certificates (18.5%). Educational participation is high, with 30.2% of residents currently enrolled in formal education, comprising 9.8% in primary, 8.9% in secondary, and 5.5% in tertiary education.

Educational participation is notably 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. As predominantly residential, most commutes are outward-bound. Car remains the dominant transport mode at 83%, while train accounts for 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, possibly due to COVID-19 conditions. Service frequency averages 310 trips daily 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. Mortality rates and chronic condition prevalence were very low across all age groups.

Private health cover was found to be very high at approximately 57% of the total population (~4,998 people), compared to 59.9% across Greater Sydney. The most common medical conditions were asthma and mental health issues, impacting 8.2 and 7.1% of residents respectively. 72.2% declared themselves completely clear of medical ailments, compared to 74.6% across Greater Sydney. The under-65 population demonstrated better than average health outcomes. The area had 16.1% of residents aged 65 and over (1,404 people). Health outcomes among seniors were 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, as per data from 2016, had a higher cultural diversity compared to most local areas. Overseas-born population constituted 33.3%, with 26.2% speaking languages other than English at home. Christianity was the predominant religion, accounting for 48.3%.

Judaism, however, was relatively more prevalent in Mount Colah at 0.4%, higher than Greater Sydney's average of 0.8%. In terms of ancestry, English (24.6%) and Australian (23.2%) were significantly overrepresented compared to regional averages of 19.0% and 17.8% respectively. Other ancestry constituted 12.1%. Notable divergences included Hungarian (0.5% vs regional 0.3%), Russian (0.5% vs 0.4%), and Korean (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 years and Australia's figure of 38 years. The 45-54 age cohort is notably over-represented in Mount Colah at 16.6%, compared to the Greater Sydney average, while the 25-34 age group is under-represented at 8.4%. Between 2021 and present, the 75-84 age group has increased from 4.3% to 5.8% of the population, and the 15-24 cohort has risen from 12.1% to 13.5%. Conversely, the 25-34 age group has declined from 10.7% to 8.4%, and the 0-4 age group has dropped from 5.9% to 4.8%. By 2041, demographic modeling suggests significant changes in Mount Colah's age profile. The 55-64 age cohort is projected to expand by 252 people (22%), from 1,151 to 1,404. Notably, the combined 65+ age groups are expected to account for 61% of total population growth, reflecting the area's aging demographic trend. Meanwhile, the 0-4 and 5-14 cohorts are projected to experience population declines.