St Agnes (SA)

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Based on analysis of ABS population updates for the broader area, and new addresses validated by Districts since the Census the suburb of St Agnes (SA)'s population is estimated at around 4,189 as of May 2026. This reflects a decrease of 44 people (1.0%) since the 2021 Census, which reported a population of 4,233 people. The change is inferred from the resident population of 4,169, estimated by Districts following examination of the latest ERP data release by the ABS (June 2025) and an additional 13 validated new addresses since the Census date. This level of population equates to a density ratio of 1,611 persons per square kilometer, which is above the average seen across national locations assessed by Districts. Population growth for the area was primarily driven by overseas migration that contributed approximately 86.0% of overall population gains during recent periods.

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St Agnes boasts a highly capable labor pool, with key service industries well represented, an unemployment rate of just 1.8%, and relative employment stability over the past year, based on Districts aggregation of statistical area data. As of March 2026, 2,152 residents are in work while the unemployment rate is 2.0% below Greater Adelaide's rate of 3.8%, and workforce participation is somewhat below standard (62.6% compared to Greater Adelaide's 66.6%). Based on Census responses, a low 11.2% of residents were found to work from home, though Covid-19 lockdown impacts should be considered.

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The latest postcode-level ATO records compiled by Districts for financial year 2023 indicate that incomes in the suburb of St Agnes (SA) fall below the national benchmarks, with a median of $52,742 and an average of $59,222. In comparison, Greater Adelaide registered a median of $54,808 and an average of $66,852. Adjusting for a Wage Price Index increase of 10.17% since financial year 2023, the estimated earnings as of March 2026 would be roughly $58,106 for the median and $65,245 for the average. Census data confirms that personal, household, and family earnings are relatively modest, positioning the area in the 38th percentile. The most common income bracket comprises 35.6% of residents (1,491 people) who receive weekly earnings between $1,500 - 2,999, mirroring the regional trend where 31.8% of the population falls into this category. Residents retain 86.7% of their income after housing costs, though disposable income is below the national average at the 42nd percentile, and the suburb ranks in the 5th decile of the SEIFA index.

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At the time of the latest Census, the housing composition in the suburb of St Agnes (SA) was comprised of 85.8% standalone houses and 14.3% other dwelling types such as apartments and townhouses, compared to 75.2% houses and 24.9% other properties across the Adelaide metropolitan region. Homeowners who own their properties outright make up 39.9% of households, which is higher than the metropolitan average, with mortgaged properties accounting for 43.1% and rental housing making up 17.0%. The median mortgage payment in the area was $1,500 monthly, while the median rent was $340 weekly, compared to metropolitan medians of $1,562 and $320. Compared to the national figures, local mortgage payments are lower than the Australian average of $1,863, and weekly rents are lower than the national median of $375.

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The majority of households in the suburb of St Agnes (SA) are families, representing 71.8% of the total. This group is composed of couples with children at 29.1%, couples without children at 29.9%, and single parents at 11.8%. Non-family living arrangements account for the remaining 28.2%, consisting of lone-person households at 26.6% and group housing at 2.1%. The median household size is 2.4 residents, which is slightly lower than the Greater Adelaide median of 2.5.

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Educational attainment levels in the suburb of St Agnes (SA) are lower than national averages, with university degrees held by 22.2% of residents aged 15+ compared to 30.4% across Australia. Among those with tertiary qualifications, 15.7% hold bachelor degrees, 4.0% have postgraduate qualifications, and 2.5% possess graduate diplomas. Vocational and trade qualifications are common, with 37.0% of the population aged 15+ holding technical credentials, consisting of advanced diplomas at 11.4% and certificates at 25.6%.

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Analysis of local transit options shows that there are 28 bus stops operating in the suburb of St Agnes (SA). These stops are served by 14 different routes, which coordinate to deliver 1,143 passenger services per week. Access to transit is convenient, with residents living an average of 223 meters from their nearest stop. Because the area is mostly residential, the majority of working residents travel outside the suburb, with private cars remaining the primary travel mode at 86% and buses carrying 10%. Households own an average of 1.4 vehicles. A minor share of the workforce, 11.2%, works from home, based on 2021 Census data which may reflect the impact of pandemic lockdowns.

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Data on chronic conditions and mortality from Districts highlights significant health challenges in the suburb of St Agnes (SA), with common illnesses being more prevalent than average, particularly among the older demographics. The level of private medical insurance is low, covering approximately 50% of the local population (~2,112 people), compared to 52.7% across Greater Adelaide and a national average of 55.7%.

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The suburb of St Agnes (SA) exhibits a high level of cultural diversity, with 24.7% of residents born outside Australia and 16.5% using a non-English language at home. Christianity is the primary religion, representing 45.1% of the local population. The most pronounced demographic concentration relative to the wider metropolitan area is in the Other category, which accounts for 1.9% of residents compared to 1.8% across Greater Adelaide.

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The median age of residents in the suburb of St Agnes (SA) is 44 years, which is older than the Greater Adelaide average of 39 and the national median of 38. The 55 - 64 age cohort is highly represented at 13.6%, while young adults aged 25 - 34 are less common at 11.6% compared to metropolitan levels. Since the 2021 Census, the proportion of residents aged 35 to 44 rose from 12.4% to 13.7%. Conversely, the 45 to 54 demographic fell from 13.0% to 11.6%, and the 65 to 74 cohort decreased from 11.9% to 10.6%. Long-term population forecasts up to 2041 indicate notable demographic shifts, with the cohort aged 85 and over projected to expand by 145 people (85%), growing from 171 to 317. Overall, residents aged 65 and over will drive 53% of the projected growth, highlighting the aging profile of the area. By contrast, the 55 to 64 group is expected to remain stable, growing by just 1% (3 people).

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St Agnes currently has an estimated 192 children under 5 years old, comprising approximately 124 children aged 0-2 and 82 children aged 3-4. This cohort declined by an estimated 7% since the previous census. though population forecasts indicate future growth, with an anticipated increase of 3% by 2041 (to approximately 197 children). Meanwhile the 5-12 cohort currently amounts to 377. Birth rates in the area have averaged 9.6 per 1,000 residents over the latest two-year period, a moderate rate (within the middle tier nationally). This rate has slowed down slightly in recent years however.