St Clair (SA)

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According to investigations of ABS demographic releases for the wider region alongside newly confirmed addresses by Districts following the Census, the resident count of the suburb of St Clair (SA) is projected to be approximately 3,514 by May 2026. This represents an expansion of 880 people (33.4%) relative to the 2021 Census, which registered 2,634 individuals. This adjustment is deduced from a resident base of 3,492, calculated by Districts through analyzing the ABS June 2025 ERP release, combined with an extra 247 validated new addresses identified after the Census date. Such a population size translates to a density of 3,738 persons per square kilometer, placing the suburb in the highest quarter of all Australian locations tracked by Districts. The 33.4% population gain in the suburb of St Clair (SA) since the 2021 census outpaced the state rise of 7.5% and the broader SA3 territory, establishing the locality as a regional leader in expansion. This demographic growth was heavily supported by arrivals from abroad, who accounted for roughly of the overall population gains in recent times.

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St Clair features a highly qualified labor force with a substantial concentration of professionals. The area boasts a low unemployment rate of 1.7% and experienced an estimated employment expansion of 13.0% over the past year, according to Districts data compiled from statistical areas. In March 2026, employed residents numbered 2,590, while the local unemployment rate sat 2.2% lower than the Greater Adelaide average of 3.8%. Labor force participation is exceptionally high, reaching 86.9% compared to the Adelaide metropolitan average of 66.6%. According to Census records, a modest 11.9% of the workforce worked from home, though this figure may have been influenced by COVID-19 pandemic restrictions.

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According to the latest postcode-level ATO statistics released by Districts for financial year 2023, taxpayers in St Clair earn a median income of $74,782 and an average of $83,222. This is exceptionally high on a national scale, compared to a median of $54,808 and an average of $66,852 across Greater Adelaide. Adjusting these figures for WPI growth of 10.17% since financial year 2023 yields estimated values of approximately $82,387 (median) and $91,686 (average) by March 2026. The 2021 Census indicates that individual weekly earnings in the area are in the 83rd percentile nationally, standing at $1,055. Income analysis shows that 42.8% of the community (1,503 individuals) earn between $1,500 - which is higher than the of residents in this bracket regionally. Although local households allocate of their income to housing costs, strong overall earnings place disposable income in the th percentile, and the area ranks in the th decile of the SEIFA index for income.

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At the time of the most recent Census, the housing mix in St Clair consisted of 33.5% detached houses and 66.5% other housing types, such as semi-detached homes, apartments, and alternative dwellings. This contrasts with the broader Adelaide metropolitan area, where detached houses make up 75.2% of the stock and other dwellings account for 24.9%. Home ownership rates in St Clair are lower than the metropolitan average at 11.7%, with the remaining properties occupied by households with a mortgage (47.6%) or renting tenants (40.7%). The median monthly mortgage payment of $1,733 is higher than the Adelaide metropolitan average of $1,562, while the median weekly rent is $360 compared to the metropolitan average of $320. On a national level, housing costs in St Clair are lower than the Australian averages, which stand at $1,863 for mortgages and $375 for rent.

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Families make up 64.6% of local households, consisting of couples with children (26.6%), couples without children (24.8%), and single parent households (11.3%). Non-family households account for the remaining 35.4%, which is split between single-person households at 29.7% and group households at 6.1%. The median household size of 2.3 people is smaller than the Greater Adelaide average of 2.5.

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The level of education in St Clair is higher than regional benchmarks, with 40.2% of residents aged 15+ holding a university degree, compared to 25.7% across SA and 28.8% in the SA3 area. This educational profile positions the workforce well for knowledge-based occupations. Bachelor degrees are the most common qualification at 27.0%, followed by postgraduate degrees at 9.1% and graduate diplomas at 4.1%. Vocational and technical training is also common, with 29.6% of residents aged 15+ holding qualifications such as advanced diplomas (11.0%) or certificates (18.6%).

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Public transport services in St Clair include 12 active stops, which consist of a combination of train stations and bus stops. These locations are serviced by 11 separate routes that generate 1,498 passenger trips each week. Transport access is rated as good, with residents living an average of 247 meters from the nearest stop. Due to the residential nature of the area, most workers commute out of the suburb, with cars remaining the primary travel mode at 78%, followed by trains at 12%. Household vehicle ownership averages 1.1 cars per dwelling, which is below the regional average. A relatively low 11.9% of residents worked from home, based on 2021 Census data that may reflect pandemic conditions.

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Health indicators show positive outcomes across St Clair, based on Districts assessments of mortality rates and chronic health conditions. Both younger and older demographics exhibit low rates of common health issues, and private health insurance coverage is exceptionally high, encompassing approximately 60% of the population (2,102 people). This compares to 52.7% of residents across Greater Adelaide.

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St Clair exhibits a diverse cultural profile, with 38.5% of the population born outside of Australia and 38.0% of households speaking a language other than English at home. Christianity is the most common religious affiliation, representing 39.1% of the community. However, Islam shows the most significant relative concentration at 6.7% of the population, compared to 3.0% across Greater Adelaide.

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With a median age of 30 years, St Clair's population is younger than the Greater Adelaide average of 39 and the national average of 38. Compared to the wider Adelaide metropolitan area, St Clair has a higher proportion of residents aged 25 - 34 (30.3%) and a lower proportion of people aged 65 - 74 (4.8%). The concentration of residents aged 25 - 34 is higher than the national figure of 14.6%. Post-2021 Census adjustments show that the influx of younger residents has lowered the median age by 2.3 years to 30. Significant shifts include the 35 to 44 age bracket growing from 18.7% to 24.3% of the population, and the 25 to age bracket rising from to . In contrast, the to age bracket fell from to , and the to group decreased from to . Demographic projections suggest that St Clair's age structure will continue to change by with the to cohort expected to grow by , adding residents to reach a total of .

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St Clair currently has an estimated 231 children under 5 years old, comprising approximately 118 children aged 0-2 and 79 children aged 3-4. This cohort grew by an estimated 20% since the previous census. while population forecasts indicate future growth, with an anticipated increase of 12% by 2041 (to approximately 258 children). Meanwhile the 5-12 cohort currently amounts to 273. While growth has been positive birth rates observed in the area have been moderate, with approximately 9.7 births per 1,000 residents recorded over the latest two-year period analysed which ranks the area within the middle tier nationally.