Marion (SA)

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According to evaluations of ABS population adjustments for the broader region alongside address datasets verified by Districts since the Census, Marion's population is estimated at approximately 4,153 as of May 2026. This indicates an expansion of 52 people (1.3%) from the 2021 Census, which documented a population of 4,101 people. The shift is calculated from a resident population of 4,063, estimated by Districts after examining the latest ERP data release from the ABS (June 2025) combined with an additional 30 validated new addresses since the Census date. This population level yields a density ratio of 2,076 persons per square kilometer, which exceeds the typical average across national locations evaluated by Districts. Population growth in the locality was mainly propelled by overseas migration, which accounted for approximately 87.0% of the overall population gains during recent times.

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Marion contains a highly qualified workforce with strong representation in essential services fields, an unemployment rate of just 3.4%, and an estimated job growth rate of 3.3% over the prior year, based on Districts compilations of statistical area data. As of March 2026, 1,980 residents are employed while the unemployment rate is 0.4% below the 3.8% rate of Greater Adelaide, although workforce participation falls substantially behind (57.7% compared to 66.6% in Greater Adelaide). According to Census responses, a minor 10.6% of residents worked from home, though the effects of Covid-19 lockdown measures should be kept in mind.

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The most recent postcode level ATO statistics from Districts for financial year 2023 show that income in the suburb of Marion is below the national average, with a median recorded at $48,947 and an average income of $56,303. This is lower than the median income of $54,808 and average income of $66,852 in Greater Adelaide. Based on a Wage Price Index expansion of 10.17% since financial year 2023, present estimates would be roughly $53,925 for the median and $62,029 for the average as of March 2026. Income data from the 2021 Census indicates that household, family, and individual incomes in Marion all place between the 20th and 25th percentiles nationally. Regarding the distribution of income, the largest segment includes 29.2% of residents (1,212 people) in the $1,500 - bracket, mirroring trends in the wider region where are in this range. Pressures on housing affordability are intense, with only of income remaining, placing at the th percentile, and the SEIFA income rank for the area sits in the th decile.

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The mix of housing in Marion, as measured in the most recent Census, consisted of 68.0% houses and 32.0% other housing types (semi-detached, apartments, and alternative dwellings), compared to 75.2% houses and 24.9% other housing types across the Adelaide metro area. At the same time, the rate of home ownership in Marion was significantly higher than the Adelaide metro figure, sitting at 38.7%, with the remaining properties being mortgaged (33.4%) or rented (27.9%). The median monthly mortgage payment in the area was higher than the Adelaide metro average at $1,712, while the median weekly rent was recorded at $355, compared to Adelaide metro's $1,562 and $320. Nationally, Marion's mortgage payments are below the Australian average of $1,863, and rents are below the national figure of $375.

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Family households make up the majority at 63.1% of all households, consisting of 24.7% couples with children, 27.5% couples without children, and 9.3% single parent families. Non-family households account for the remaining 36.9%, with single-person households at 32.9% and group households representing 4.0% of the total. The median household size of 2.3 people is smaller than the average of 2.5 in Greater Adelaide.

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The educational profile of the area is distinct within the region, with university degree rates (30.9% of residents aged 15+) surpassing the SA average of 25.7% and the SA4 region average of 28.1%, showing the community's focus on tertiary education. Bachelor degrees are the most common at 20.8%, followed by postgraduate degrees (7.2%) and graduate diplomas (2.9%). Vocational and technical skills are also prominent, with 28.3% of residents aged 15+ holding trade credentials, consisting of advanced diplomas (10.1%) and certificates (18.2%).

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Public transport analysis shows 23 active transit stops in Marion, featuring a combination of train and bus services. These stops are serviced by 36 unique routes, which together offer 2,214 weekly passenger journeys. Transport accessibility is classified as excellent, with residents generally situated 178 meters from the nearest transit stop. As a majorly residential locality, most residents travel outwards for work, with private cars remaining the primary mode at 81%, followed by 7% using buses and 6% using trains. Vehicle ownership stands at an average of 1.1 per household, which is below the regional average. A relatively low 10.6% of residents work from home (2021 Census; potentially reflecting COVID-19 settings).

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Marion experiences notable health difficulties, according to Districts' evaluation of mortality rates and chronic illness prevalence, with typical health issues being common overall, though to a much higher degree among older residents, and the rate of private health insurance is relatively low at roughly 49% of the total population (~2,047 people). This compares to 52.7% across Greater Adelaide and a national average of 55.7%.

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Marion is more culturally diverse than most local markets, with 29.4% of its residents born overseas and 22.7% speaking a language other than English at home. The main religion in Marion is Christianity, representing 47.4% of the population. However, the most visible overrepresentation is in Hinduism, which represents 4.7% of the population, compared to 2.8% across Greater Adelaide.

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The median age of 43 years in Marion is notably higher than Greater Adelaide's average of 39 and is older than Australia's median of 38 years. Compared to Greater Adelaide, Marion has a larger share of residents aged 85+ (7.2%) but fewer children aged 5 - 14 (7.8%). Since the 2021 Census, the 35 to 44 age bracket has expanded from 11.2% to 13.2% of the population, whereas the 15 to 24 group has decreased from 13.3% to 11.8%. Looking forward to 2041, demographic projections show major changes in Marion's age structure, with the 85+ cohort growing by 71% (212 people) to reach 512 from while the to group grows by a minimal ( people).

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Marion currently has an estimated 186 children under 5 years old, comprising approximately 129 children aged 0-2 and 85 children aged 3-4. This cohort grew by an estimated 3% since the previous census. while population forecasts indicate future growth, with an anticipated increase of 12% by 2041 (to approximately 209 children). Meanwhile the 5-12 cohort currently amounts to 304. While growth has been positive birth rates observed in the area have been moderate, with approximately 10.8 births per 1,000 residents recorded over the latest two-year period analysed which ranks the area within the middle tier nationally.