St Clair (SA)

St Clair 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 May 2026, the estimated population of the suburb of St Clair (SA) is around 3,514, reflecting an increase of 880 people since the 2021 Census. The 2021 Census reported a population of 2,634 in St Clair. This growth is inferred from AreaSearch's estimation of the resident population at 3,492 following examination of the ABS's latest ERP data release in June 2025 and an additional 247 validated new addresses since the Census date. The resulting population density ratio is 3,738 persons per square kilometer, placing St Clair in the upper quartile relative to national locations assessed by AreaSearch. This growth rate of 33.4% exceeds both the state's growth rate of 7.5% and the SA3 area's growth rate since the 2021 Census. Overseas migration contributed approximately 87.0% of overall population gains during recent periods, driving this growth.

AreaSearch adopts ABS/Geoscience Australia projections for each SA2 area, released in 2024 with a base year of 2022. For areas not covered by this data and years post-2032, the SA State Government's Regional/LGA projections by age category are adopted, based on 2021 data and released in 2023. These projections indicate that St Clair is expected to experience a population increase just below the median of national areas by 2041, with an estimated growth of 424 persons over this period, reflecting an overall increase of 11.4%.

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

St Clair has averaged approximately 47 new dwelling approvals annually. Between FY-21 and FY-25, around 239 homes were approved, with an additional 51 approved so far in FY-26. On average, about 1.7 people moved to the area per dwelling built over the past five financial years, though this has moderated to 0.5 people per dwelling over the past two years. The average expected construction cost value for new homes is $320,000.

This year, $3.5 million in commercial development approvals have been recorded. Compared to Greater Adelaide, St Clair shows 103.0% higher construction activity per person, indicating robust developer interest. New building activity comprises 31.0% standalone homes and 69.0% medium and high-density housing. St Clair reflects a developing area with around 63 people per approval. Future projections estimate St Clair adding 402 residents by 2041, with current development rates suggesting new housing supply should meet demand comfortably.

Future projections show St Clair adding 402 residents by 2041 (from the latest AreaSearch quarterly estimate). At current development rates, new housing supply should comfortably meet demand, providing good conditions for buyers and potentially supporting growth beyond current population projections.

St Clair has emerging levels of nearby infrastructure activity, ranking in the 26thth percentile nationally

Changes in local infrastructure significantly impact an area's performance. AreaSearch has identified five projects expected to affect the region. Notable initiatives include St Clair Village - Stage 6 & 7, St. James, Kidman Park, Babcock Facility Expansion, and St Clair. The following list highlights those likely to be most relevant.

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

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The exceptional employment performance in St Clair places it among Australia's strongest labour markets

St Clair has an educated workforce with strong professional services representation. Its unemployment rate was 1.9% as of December 2025, lower than Greater Adelaide's 3.8%. Employment growth over the past year was estimated at 12.7%.

Workforce participation in St Clair was high at 86.7%, compared to Greater Adelaide's 66.0%. A low 11.9% of residents worked from home, potentially influenced by Covid-19 lockdowns. Major employment industries include health care & social assistance, retail trade, and public administration & safety. St Clair specializes in public administration & safety, with an employment share 1.4 times the regional level.

However, construction is under-represented at 6.1% compared to Greater Adelaide's 8.7%. Employment opportunities locally may be limited, indicated by working population vs resident population counts. Between December 2024 and December 2025, employment increased by 12.7%, labour force by 12.0%, reducing unemployment by 0.6 percentage points. In contrast, Greater Adelaide had employment growth of 4.2% and labour force growth of 3.9%, with a 0.3 percentage point drop in unemployment. Jobs and Skills Australia's national employment forecasts from May-25 project overall growth of 6.6% over five years and 13.7% over ten years. Applying these projections to St Clair's employment mix suggests local employment should increase by 6.5% over five years and 13.6% 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

The suburb of St Clair has a median taxpayer income of $74,782 and an average of $83,222 according to the latest postcode level ATO data aggregated by AreaSearch for financial year 2023. This is notably higher than the national median income of $54,808 and average income of $66,852 in Greater Adelaide. By March 2026, with a Wage Price Index growth of 10.17%, estimated incomes would be approximately $82,387 (median) and $91,686 (average). According to Census 2021 data, individual earnings in St Clair stand at the 83rd percentile nationally ($1,055 weekly). Income analysis reveals that 42.8% of locals (1,503 people) fall into the $1,500 - 2,999 income category. This is higher than the surrounding region's 31.8% in the same category. Residents allocate 17.8% of their income to housing costs, but strong earnings place disposable income at the 56th percentile nationally. The area's SEIFA income ranking places it in the 7th decile.

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

St Clair's dwelling structure, as assessed in the latest Census, consisted of 33.5% houses and 66.5% other dwellings (semi-detached, apartments, 'other' dwellings). This compared to Adelaide metro's 75.2% houses and 24.9% other dwellings. Home ownership in St Clair was at 11.7%, with mortgaged dwellings at 47.6% and rented ones at 40.7%. The median monthly mortgage repayment in the area was $1,733, higher than Adelaide metro's average of $1,562. The median weekly rent figure for St Clair was $360, compared to Adelaide metro's $320. Nationally, St Clair's mortgage repayments were lower than the Australian average of $1,863, and rents were less than the national figure of $375.

St Clair features high concentrations of group households, with a lower-than-average median household size

Family households constitute 64.6 percent of all households, including 26.6 percent couples with children, 24.8 percent couples without children, and 11.3 percent single parent families. Non-family households account for the remaining 35.4 percent, with lone person households at 29.7 percent and group households comprising 6.1 percent of the total. The median household size is 2.3 people, which is smaller than the Greater Adelaide average of 2.5.

Educational attainment in St Clair aligns closely with national averages, showing typical qualification patterns and performance metrics

St Clair's educational attainment is notably higher than broader benchmarks. Among residents aged 15+, 40.2% hold university qualifications, compared to 25.7% in South Australia (SA) and 28.8% in the SA3 area. This educational advantage positions St Clair favourably for knowledge-based opportunities. Bachelor degrees are most prevalent at 27.0%, followed by postgraduate qualifications at 9.1% and graduate diplomas at 4.1%.

Vocational credentials are also prominent, with 29.6% of residents aged 15+ holding them - advanced diplomas account for 11.0% and certificates for 18.6%. Educational participation is high in St Clair, with 29.3% of residents currently enrolled in formal education. This includes 10.1% in tertiary education, 7.4% in primary education, and 4.4% pursuing secondary education.

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

The analysis of public transportation in St Clair indicates that there are twelve active transport stops currently operating within the area. These stops offer a mix of train and bus services, with eleven individual routes collectively facilitating 1,498 weekly passenger trips. The accessibility of these transport options is rated as good, with residents typically located approximately 247 meters from their nearest transport stop. As St Clair is primarily residential, most residents commute outward. The car remains the dominant mode of transportation at 78%, while train usage stands at 12%. On average, there are 1.1 vehicles per dwelling in the area, which is below the regional average.

According to the 2021 Census, a relatively low 11.9% of residents work from home, potentially due to COVID-19 conditions. The service frequency averages 214 trips per day across all routes, equating to approximately 124 weekly trips per individual stop.

St Clair's residents are extremely healthy with both young and old age cohorts seeing low prevalence of common health conditions

Analysis of health metrics shows strong performance throughout St Clair. AreaSearch's assessment indicates low prevalence of common health conditions across both young and old age cohorts.

The rate of private health cover is exceptionally high at approximately 60% of the total population (2,102 people), compared to 52.7% across Greater Adelaide. The most common medical conditions in the area are mental health issues and asthma, impacting 8.0 and 6.2% of residents respectively. 78.7% of residents declare themselves completely clear of medical ailments, compared to 67.9% across Greater Adelaide. Working-age residents have low chronic condition prevalence. The area has 7.2% of residents aged 65 and over (253 people), lower than the 19.2% in Greater Adelaide. Health outcomes among seniors are above average, with national rankings broadly in line with the general population.

St Clair 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 Clair's cultural diversity is notable with 38.5% of its population born overseas and 38.0% speaking a language other than English at home. The predominant religion in St Clair is Christianity, accounting for 39.1% of the population. Islam is overrepresented compared to Greater Adelaide, comprising 6.7% versus 3.0%.

In terms of ancestry, the top three groups in St Clair are English (18.9%), Australian (16.7%), and Other (15.6%). These figures are lower than regional averages except for the 'Other' category which is substantially higher. Some ethnic groups notably diverge from regional averages: Hungarian at 0.6% (regional average 0.3%), Serbian at 1.1% (regional average 0.4%), and Russian at 0.8% (regional average 0.3%).

St Clair hosts a very young demographic, ranking in the bottom 10% of areas nationwide

St Clair's median age is 30 years, which is younger than Greater Adelaide's average of 39 and lower than the national average of 38. Compared to Greater Adelaide, St Clair has a higher proportion of residents aged 25-34 (30.3%) but fewer residents aged 65-74 (4.8%). This concentration of 25-34 year-olds is significantly higher than the national average of 14.6%. Post-2021 Census data shows that younger residents have reduced the median age by 2.3 years to 30. Key changes include an increase in the 35-44 age group from 18.7% to 24.3%, and a rise in the 25-34 cohort from 26.0% to 30.3%. Conversely, the 15-24 age group has declined from 13.4% to 10.2%, and the 45-54 age group has dropped from 11.2% to 8.2%. Demographic modeling indicates that St Clair's age profile will significantly change by 2041, with the 25-34 cohort projected to grow by 9%, adding 91 residents to reach a total of 1,156.