Marino - Seaview Downs

An assessment of population growth drivers in Marino - Seaview Downs reveals an overall ranking slightly below national averages considering recent, and medium term trends

Marino - Seaview Downs' population was 10,084 as of November 2025, an increase of 381 people since the 2021 Census. This growth represents a 3.9% rise from the previous figure of 9,703. The change is inferred from ABS data showing an estimated resident population of 10,077 in June 2024 and the addition of 8 new addresses since the Census date. The population density was 825 persons per square kilometer, comparable to averages across other areas assessed by AreaSearch. Marino - Seaview Downs' growth rate of 3.9% since the census is within 1.5 percentage points of its SA4 region's growth rate of 5.4%. Overseas migration accounted for approximately 64.7% of overall population gains in recent periods.

AreaSearch uses 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 adjusted using a method of weighted aggregation from LGA to SA2 levels. By 2041, Marino - Seaview Downs' population is expected to increase by approximately 695 persons, reflecting a growth rate just below the national median for statistical areas over this period.

Recent residential development output has been above average within Marino - Seaview Downs when compared nationally

Seaview Downs has seen approximately 37 new homes approved each year over the past five financial years, totalling 185 homes. As of FY26, 35 approvals have been recorded. On average, these new dwellings accommodate around 2.1 residents per year, indicating solid demand that supports property values. The average expected construction cost value for new homes is $390,000, reflecting a focus on the premium segment with upmarket properties.

In FY26, $17.2 million in commercial development approvals have been recorded, suggesting balanced commercial development activity compared to Greater Adelaide. Marino - Seaview Downs shows approximately half the construction activity per person while placing among the 60th percentile of areas assessed nationally. New development consists of 84.0% standalone homes and 16.0% attached dwellings, maintaining the area's traditional low density character with a focus on family homes appealing to those seeking space.

With around 245 people per approval, Marino - Seaview Downs reflects a low density area. According to AreaSearch's latest quarterly estimate, Marino - Seaview Downs is projected to gain 688 residents by 2041. Given current construction levels, housing supply should adequately meet demand, creating favourable conditions for buyers while potentially enabling growth that exceeds current forecasts.

Marino - Seaview Downs has limited levels of nearby infrastructure activity, ranking in the 14thth percentile nationally

The performance of an area is significantly influenced by changes to its local infrastructure. AreaSearch has identified eight projects that are expected to impact this particular area. Among these key projects are Flagstaff Road Upgrade, Seaview Downs Primary School Redevelopment, Residential Development at 1 Greenfield Road, and Southern Suburbs Residential Policy Code Amendment. The following list details those projects likely to be most relevant.

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Employment conditions in Marino - Seaview Downs demonstrate exceptional strength compared to most Australian markets

Marino-Seaview Downs has an educated workforce with significant representation in essential services sectors. The unemployment rate was 2.4% as of September 2025, lower than Greater Adelaide's 3.9%.

Employment growth over the past year was estimated at 3.3%. As of September 2025, 5625 residents were employed with a participation rate of 64.4%, slightly higher than Greater Adelaide's 61.7%. Key industries include health care & social assistance, construction, and education & training. Construction is particularly prominent, employing 1.4 times the regional average.

Manufacturing employs only 5.3% locally compared to Greater Adelaide's 7.0%. Over the year to September 2025, employment increased by 3.3%, while labour force grew by 3.5%, leading to a slight rise in unemployment rate (0.2 percentage points). In contrast, Greater Adelaide saw employment grow by 3.0% and unemployment fall by 0.1 percentage points. Statewide data as of 25-Nov shows South Australia's employment growth was 1.19% year-on-year, with an unemployment rate of 4.0%, outperforming the national average of 0.14%. National employment forecasts from May-25 project a 6.6% increase over five years and 13.7% over ten years. Applying these projections to Marino-Seaview Downs' employment mix suggests local employment could grow by 6.9% in five years and 14.2% in ten years, assuming constant population growth.

The economic profile demonstrates above-average performance, with income metrics exceeding national benchmarks based on AreaSearch comparative assessment

AreaSearch's latest postcode level ATO data for financial year 2022 shows that Marino - Seaview Downs SA2 has an income above the national average. The median income is $54,064 and the average income stands at $69,304. In comparison, Greater Adelaide's figures are a median income of $52,592 and an average income of $64,886. Based on Wage Price Index growth of 12.83% since financial year 2022, current estimates would be approximately $61,000 (median) and $78,196 (average) as of September 2025. According to Census 2021 income data, household, family and personal incomes in Marino - Seaview Downs cluster around the 56th percentile nationally. The distribution shows that the $1,500 - 2,999 bracket dominates with 33.2% of residents (3,347 people), similar to the surrounding region where this cohort represents 31.8%. After housing costs, 86.6% of income remains for other expenses and the area's SEIFA income ranking places it in the 7th decile.

Marino - Seaview Downs is characterized by a predominantly suburban housing profile, with above-average rates of outright home ownership

In Marino - Seaview Downs, as per the latest Census, 92.9% of dwellings were houses with the remaining 7.1% comprising semi-detached homes, apartments, and other types. This differs from Adelaide metro's distribution of 70.8% houses and 29.2% other dwellings. The home ownership rate in Marino - Seaview Downs was 40.4%, with mortgaged dwellings at 44.3% and rented ones at 15.3%. The median monthly mortgage repayment in the area was $1,820, higher than Adelaide metro's average of $1,700. Meanwhile, the median weekly rent was $375, compared to Adelaide metro's $330. Nationally, Marino - Seaview Downs' median monthly mortgage repayments were lower than the Australian average of $1,863, while rents were comparable at $375.

Marino - Seaview Downs has a typical household mix, with a higher-than-average median household size

Family households constitute 75.3% of all households, including 33.9% couples with children, 30.3% couples without children, and 10.3% single parent families. Non-family households account for the remaining 24.7%, with lone person households at 21.8% and group households comprising 2.9%. The median household size is 2.6 people, which is larger than the Greater Adelaide average of 2.4.

The educational profile of Marino - Seaview Downs exceeds national averages, with above-average qualification levels and academic performance metrics

Marino - Seaview Downs has a higher proportion of residents with university qualifications (30.4%) compared to the South Australian average (25.7%). Bachelor degrees are most common at 20.4%, followed by postgraduate qualifications (7.1%) and graduate diplomas (2.9%). Vocational credentials are also prevalent, with 35.7% of residents aged 15+ holding such qualifications, including advanced diplomas (11.7%) and certificates (24.0%).

Educational participation is high, with 27.7% of residents currently enrolled in formal education. This includes primary education (9.6%), secondary education (7.2%), and tertiary education (5.7%).

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

Marino-Seaview Downs has 46 active public transport stops, operated by a mix of train and bus services. These stops are served by 28 individual routes, offering a total of 3,332 weekly passenger trips. Transport accessibility is rated good, with residents typically located 250 meters from the nearest stop.

On average, service frequency across all routes is 476 trips per day, which equals approximately 72 weekly trips per individual stop.

Marino - Seaview Downs's residents are healthier than average in comparison to broader Australia with a fairly standard level of common health conditions seen across both young and old age cohorts

Marino - Seaview Downs residents show relatively positive health outcomes, with common conditions seen across both young and old age groups. Private health cover is high at approximately 54% of the total population (~5,485 people), compared to 50.9% across Greater Adelaide.

The most prevalent medical conditions are arthritis (8.0%) and asthma (7.7%), while 69.7% report no medical ailments, slightly higher than Greater Adelaide's 68.1%. Residents aged 65 and over comprise 21.2%, or 2,134 people, compared to Greater Adelaide's 19.2%. Health outcomes among seniors are notably strong, outperforming the general population in health metrics.

The level of cultural diversity witnessed in Marino - Seaview Downs was found to be slightly above average when compared nationally for a number of language and cultural background related metrics

Marino-Seaview Downs was found to have above-average cultural diversity, with 13.0% of its population speaking a language other than English at home and 25.6% born overseas. Christianity is the predominant religion in Marino-Seaview Downs, comprising 40.9% of the population. Notably, the 'Other' religious category comprises 1.3%, slightly higher than the Greater Adelaide average of 1.6%.

The top three ancestry groups are English (31.7%), Australian (24.5%), and Irish (7.2%). Some ethnic groups show notable differences in representation: Polish is overrepresented at 1.2% compared to the regional average of 1.1%, German at 5.8% versus 5.0%, and Welsh at 0.7% compared to 0.6%.

Marino - Seaview Downs's median age exceeds the national pattern

The median age in Marino - Seaview Downs is 43 years, which is significantly higher than Greater Adelaide's average of 39 years, and considerably older than Australia's median age of 38 years. Compared to Greater Adelaide, Marino - Seaview Downs has a higher proportion of residents aged 75-84 (8.4%), but fewer residents aged 25-34 (9.8%). According to the 2021 Census, the 15-24 age group increased from 11.0% to 12.7%, while the 75-84 cohort rose from 7.1% to 8.4%. Conversely, the 65-74 age group declined from 11.8% to 10.4%. By 2041, demographic projections show significant shifts in Marino - Seaview Downs' age structure. The 85+ group is expected to grow by 116%, reaching 527 people from 244. Meanwhile, the 0-4 and 5-14 cohorts are projected to experience population declines.