St Marys (NSW)

St Marys lies within the top quartile of areas nationally for population growth performance according to AreaSearch analysis of recent, and medium to long-term trends

As of November 2025, the estimated population of St Marys (NSW) is around 14,578, reflecting a 10.0% increase since the 2021 Census, which reported a population of 13,256 people. This growth is inferred from AreaSearch's estimate of the resident population at 14,478, based on their examination of the latest ERP data release by the ABS in June 2024 and an additional 370 validated new addresses since the Census date. The population density ratio is 1,496 persons per square kilometer, above the average seen across national locations assessed by AreaSearch. St Marys' growth rate of 10.0% since the 2021 census exceeded that of the SA3 area (4.4%) and the SA4 region, marking it as a growth leader in the region. Overseas migration contributed approximately 67.0% of overall population gains during recent periods. AreaSearch is adopting ABS/Geoscience Australia projections for each SA2 area, released in 2024 with 2022 as the base year, and NSW State Government's SA2 level projections for areas not covered by this data, 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. Projected population growth indicates an above median increase for national areas, with St Marys expected to increase by 3,419 persons to 2041 based on aggregated SA2-level projections, reflecting a total increase of 22.4% over the 17 years.

AreaSearch assessment of residential development activity positions St Marys among the top 25% of areas assessed nationwide

St Marys averaged approximately 125 new dwelling approvals annually based on AreaSearch analysis of ABS building approval numbers. Around 625 homes were approved in the five financial years from FY-21 to FY-25, with an additional 18 approved so far in FY-26. On average, 1.6 new residents arrived per new home over the past five financial years, indicating balanced supply and demand. However, this ratio intensified to 4.7 people per dwelling over the last two financial years, suggesting growing popularity and potential undersupply.

The average value of new homes being built was $341,000, which is under regional levels, offering more accessible housing choices for buyers. In FY-26, $81.4 million in commercial approvals have been registered, indicating robust local business investment. Compared to Greater Sydney, St Marys has 95.0% more construction activity per person. Recent construction comprises 29.0% detached dwellings and 71.0% townhouses or apartments, marking a significant shift from the current housing pattern of 51.0% houses. This trend may be due to diminishing developable land availability and evolving lifestyle preferences. St Marys has around 188 people per dwelling approval, characteristic of a growth area.

Population forecasts estimate St Marys will gain 3,269 residents by 2041. Current construction rates appear balanced with future demand, fostering steady market conditions without excessive price pressure.

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

The performance of an area is significantly influenced by changes in local infrastructure, major projects, and planning initiatives. AreaSearch has identified a total of 32 projects that are expected to impact the area. Notable projects include Sydney Metro Western Sydney Airport Line, St Marys Station Upgrade and Metro Integration, Luddenham Metro Station and Sydney Science Park, and Western Sydney Aerotropolis Infrastructure and Development. The following list details those projects likely to be most relevant.

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

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Employment drivers in St Marys are experiencing difficulties, placing it among the bottom 20% of areas assessed across Australia

St Marys has a skilled workforce with manufacturing and industrial sectors prominently represented. Its unemployment rate is 8.5%, according to AreaSearch's aggregation of statistical area data.

As of June 2025, there are 6,579 residents employed while the unemployment rate stands at 4.3% above Greater Sydney's rate of 4.2%. Workforce participation in St Marys is lower at 54.2%, compared to Greater Sydney's 60.0%. The leading employment industries among St Marys residents are health care & social assistance, retail trade, and transport, postal & warehousing. Notably, transport, postal & warehousing has a high concentration with employment levels at 2.1 times the regional average.

However, professional & technical services have limited presence, with only 4.0% of employment compared to the regional average of 11.5%. As per the Census, there are 0.6 workers for each resident in St Marys, indicating a level of local employment opportunities above the norm. Over the 12 months to June 2025, labour force levels decreased by 2.3% and employment declined by 2.0%, causing the unemployment rate to fall by 0.2 percentage points. In comparison, Greater Sydney saw employment grow by 2.6%, labour force expand by 2.9%, and unemployment rise by 0.3 percentage points. Jobs and Skills Australia's national employment forecasts from Sep-22 project that national employment will increase by 6.6% over five years and 13.7% over ten years. Applying these industry-specific projections to St Marys' employment mix suggests local employment should increase by 6.3% over five years and 13.1% over ten years, although these are simple weighting extrapolations for illustrative purposes only and do not account for localised population projections.

The area's income profile falls below national averages based on AreaSearch analysis

AreaSearch's latest postcode level ATO data for financial year ending June 2022 shows median income in St Marys was $54,753 and average income was $59,271. This is below Greater Sydney's median income of $56,994 and average income of $80,856. By September 2025, adjusted for Wage Price Index growth of 12.61%, estimated median income in St Marys would be approximately $61,657 and average income $66,745. The 2021 Census data ranks household, family, and personal incomes in St Marys between the 31st and 39th percentiles. Most residents (35.4%, or 5,160 people) earn between $1,500 and $2,999 weekly, similar to the broader regional trend of 30.9%. Income remaining after housing costs in St Marys is ranked at the 23rd percentile, with only 78.1% of income left.

St Marys displays a diverse mix of dwelling types, with a higher proportion of rental properties than the broader region

St Marys' dwelling structure, as per the latest Census, consisted of 51.3% houses and 48.7% other dwellings. In comparison, Sydney metro had 81.7% houses and 18.2% other dwellings. Home ownership in St Marys was 18.4%, with mortgaged dwellings at 27.4% and rented ones at 54.2%. The median monthly mortgage repayment was $1,847, below Sydney metro's $2,000. The median weekly rent was $365, compared to Sydney metro's $390. Nationally, St Marys' mortgage repayments were lower than the Australian average of $1,863, and rents were less than the national figure of $375.

St Marys features high concentrations of lone person households and group households, with a lower-than-average median household size

Family households account for 64.9% of all households, including 27.6% couples with children, 17.8% couples without children, and 17.3% single parent families. Non-family households constitute the remaining 35.1%, with lone person households at 31.2% and group households comprising 4.1%. The median household size is 2.5 people, which is smaller than the Greater Sydney average of 2.8.

St Marys shows below-average educational performance compared to national benchmarks, though pockets of achievement exist

The area's university qualification rate in 20.7% significantly lags behind Greater Sydney's average of 38.0%. Bachelor degrees are the most common at 14.2%, followed by postgraduate qualifications (5.3%) and graduate diplomas (1.2%). Vocational credentials are prevalent, with 35.2% of residents aged 15+ holding them - advanced diplomas at 10.1% and certificates at 25.1%. Educational participation is high at 32.7%, including 12.1% in primary education, 7.8% in secondary education, and 4.6% pursuing tertiary education.

St Marys has four schools with a combined enrollment of 1,856 students, serving typical Australian school conditions (ICSEA: 992) with balanced educational opportunities. Education provision is balanced with three primary and one secondary school serving distinct age groups.

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

St Marys has 90 active public transport stops, offering a mix of train and bus services. These stops are served by 44 different routes, collectively facilitating 6,696 weekly passenger trips. Residents enjoy excellent transport accessibility, with an average distance of 163 meters to the nearest stop.

Service frequency averages 956 trips per day across all routes, translating to roughly 74 weekly trips per individual stop.

Health outcomes in St Marys are marginally below the national average with the level of common health conditions among the general population somewhat typical, though higher than the nation's average among older cohorts

Health indicators suggest below-average outcomes in St Marys compared to national averages.

Common health conditions are somewhat typical but higher among older cohorts. Approximately 50% of the total population (~7,348 people) have private health cover. The most common medical conditions are asthma and mental health issues, impacting 8.4% and 8.3% of residents respectively. About 68.8% of residents declare themselves completely clear of medical ailments, compared to 69.7% across Greater Sydney. St Marys has 13.2% of residents aged 65 and over (1,924 people), which is lower than the 14.3% in Greater Sydney. Health outcomes among seniors require more attention than those of the broader population.

St Marys is among the most culturally diverse areas in the country based on AreaSearch assessment of a range of language and cultural background related metrics

St Marys has a high cultural diversity, with 36.9% of its population born overseas and 34.2% speaking a language other than English at home. The predominant religion in St Marys is Christianity, making up 58.7% of the population. However, Hinduism is overrepresented, comprising 5.8% compared to the Greater Sydney average of 3.5%.

The top three ancestry groups are Australian (19.8%), Other (19.3%), and English (18.5%). Notably, Filipino (5.2%) and Samoan (2.6%) populations are higher than regional averages of 4.5% and 2.1%, respectively. Maori representation is also slightly higher at 1.5%.

St Marys hosts a young demographic, positioning it in the bottom quartile nationwide

At age 34 years, St Mary's median age is lower than Greater Sydney's average of 37 years and considerably younger than Australia's 38 years. Compared to Greater Sydney, St Mary's has a higher percentage of residents aged 0-4 years (7.6%) but fewer residents aged 75-84 years (4.2%). Between the 2021 Census and now, the population aged 15-24 years has increased from 11.8% to 13.1%, while the population aged 25-34 years has decreased from 17.0% to 16.2%. By 2041, demographic forecasts indicate significant changes in St Mary's population. The 75-84 age group is projected to grow by 81%, adding 493 residents to reach a total of 1,106. Conversely, the 0-4 age group shows minimal growth of just 8% (85 people).