St Marys (SA)

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According to census figures and address data monitored by Districts, the suburb of St Marys (SA) has an estimated resident count of 3,269 as of May 2026. This represents an addition of 259 individuals (8.6%) from the 2021 Census, when the count was 3,010. The updated figures are calculated from a baseline of 3,255 residents derived from ABS statistics issued in June 2025, combined with 10 validated new addresses added after the census date. The resulting density stands at 1,786 persons per square kilometer, which exceeds the national average for areas evaluated by Districts. The expansion rate of 8.6% since the 2021 census outpaced the SA3 region (5.6%) and the SA4 territory, positioning the suburb of St Marys (SA) as a local growth frontrunner. Incoming overseas migration was the primary driver, accounting for roughly 79.0% of the total demographic gains in recent times.

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The local workforce is characterized by high levels of education and a strong presence in essential services, showing an unemployment rate of only 3.3% and a yearly job growth rate of 5.6%. In March 2026, employed residents numbered 1,896, while the local jobless rate was 0.6% below the 3.8% recorded across Greater Adelaide. Furthermore, the participation rate is high at 72.5%, compared to 66.6% across Greater Adelaide. Census statistics show that only 10.2% of the working population worked from home, though this may have been influenced by pandemic containment measures.

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ATO records from the 2023 financial year show that taxpayers in the suburb of St Marys had a median income of $52,966 and an average income of $64,830. These figures are below the national averages and compare to median and average levels of $54,808 and $66,852 across Greater Adelaide. Factoring in a Wage Price Index rise of 10.17% since the 2023 financial year, estimated incomes as of March 2026 would be around $58,353 for the median and $71,423 for the average. Census data places household, family, and individual incomes in the modest 35th to 46th percentiles. The most common earnings bracket is $1,500 - 2,999, which includes 34.6% of the population (1,131 individuals), which aligns with the regional proportion of 31.8%. Financial strain from housing is high, with residents retaining only of their income, placing the area in the th percentile for affordability and the th decile of the SEIFA index.

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At the most recent Census, the local housing mix consisted of 66.3% detached houses and 33.7% alternative dwellings such as townhouses and apartments, compared to 75.2% houses and 24.9% other dwellings across the Adelaide metro area. Home ownership rates lagged the metropolitan average, sitting at 24.6%, with the remaining properties being mortgaged (38.6%) or rented (36.8%). The median monthly mortgage cost was $1,654, which is higher than the metropolitan median of $1,562, while the median weekly rent was $285, compared to $320 across Adelaide metro. On a national scale, mortgage repayments are lower than the Australian average of $1,863, and rents are below the national median of $375.

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Families make up 62.8% of households, consisting of couples with children (28.0%), couples without children (23.1%), and single-parent households (10.4%). The remaining 37.2% are non-family households, which are dominated by lone persons at 31.5% and group households at 5.7%. The median household size is 2.4 individuals, slightly below the Greater Adelaide average of 2.5.

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Academic credentials in St Marys are high, with 36.4% of residents aged 15+ holding a university degree, compared to 25.7% across SA and 28.1% across the SA4 region. Bachelor degrees are the most common credential at 24.2%, followed by postgraduate degrees at 9.9% and graduate diplomas at 2.3%. Vocational qualifications are held by 29.6% of residents aged 15+, consisting of advanced diplomas (10.0%) and certificates (19.6%).

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Public transport links include 17 active bus stops in the area, serviced by 30 separate routes that support 2,213 passenger trips weekly. Accessibility is favorable, with the average distance to a stop being 210 meters. The suburb is primarily residential, with most residents travelling elsewhere for work. Cars are the main transport method at 81%, followed by buses at 11%. Car ownership averages 1.2 per home, below the regional average. Working from home was recorded for 10.2% of residents in the 2021 Census, which may have been influenced by COVID-19 rules.

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The local population faces notable health difficulties based on mortality and chronic illness rates, with health conditions present across both younger and older demographics. Private health insurance coverage is slightly above the average for an SA2 region, covering approximately 53% of the community, which equates to about 1,720 individuals.

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The suburb shows high cultural diversity, with 35.4% of residents born outside Australia and 34.9% speaking a non-English language at home. Christianity is the largest religious group, representing 43.7% of the population. The most prominent statistical divergence is in the Other religious category, which accounts for 2.8% of residents compared to 1.8% across Greater Adelaide.

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The median age of 35 indicates the population is younger than the Greater Adelaide median of 39 and the national median of 38. Young adults aged 25 - 34 are prominent at 20.2%, well above the national average of 14.6%, while residents aged 65 - 74 are less common at 5.3%. Since 2021, the 35 to 44 age bracket grew from 16.1% to 17.3% and the 85+ bracket rose from 1.7% to 2.7%. Meanwhile, the 65 to 74 group fell from 6.6% to 5.3% and the 55 to 64 group declined from to . By demographic shifts will see the to cohort increase by ( people) to reach from while the to cohort is expected to grow by a small ( people).

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St Marys currently has an estimated 228 children under 5 years old, comprising approximately 106 children aged 0-2 and 70 children aged 3-4. This cohort grew by an estimated 13% since the previous census. while population forecasts indicate future growth, with an anticipated increase of 10% by 2041 (to approximately 250 children). Meanwhile the 5-12 cohort currently amounts to 285. While growth has been positive birth rates observed in the area have been moderate, with approximately 9.8 births per 1,000 residents recorded over the latest two-year period analysed which ranks the area within the middle tier nationally. This rate has slowed down slightly in recent years however.