Seacombe Gardens (SA)

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Analysis of ABS population updates for the wider region, along with recent address validations by Districts since the Census, indicates the population of the suburb of Seacombe Gardens is approximately 3,691 in May 2026. This represents an addition of 318 residents (9.4%) from the 2021 Census count of 3,373. This change is calculated from the resident population of 3,687, which Districts estimated after evaluating the ABS ERP release from June 2025 and incorporating 45 validated new addresses since the Census. This population level translates to a density of 3,728 individuals per square kilometer, placing the suburb of Seacombe Gardens in the highest quartile among national localities evaluated by Districts. The 9.4% growth rate of the suburb of Seacombe Gardens since the 2021 Census outpaced the broader SA4 region (6.2%) and the SA3 area, establishing it as a leading growth zone. Overseas migration was the primary driver of this demographic expansion, accounting for approximately of the overall population increases in recent times.

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Workforce analysis reveals a highly educated resident population with strong representation in essential service sectors, an unemployment rate of just 3.7%, and an estimated job growth rate of 5.1% over the prior year, based on Districts compilations of statistical area data. As of March 2026, 1,973 residents are employed, with the unemployment rate sitting 0.2% below the Greater Adelaide average of 3.8%, and the labor force participation rate matching the Greater Adelaide figure of 66.6%. According to Census records, a low 8.5% of workers worked from home, though the influence of Covid-19 lockdowns should be kept in mind.

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The most recent postcode-level ATO records from Districts for financial year 2023 show that incomes in Seacombe Gardens fall below the national benchmark, with a median of $51,048 and an average of $60,595. This is lower than the Greater Adelaide median income of $54,808 and average income of $66,852. Adjusting for a Wage Price Index rise of 10.17% since financial year 2023, current estimates for March 2026 are approximately $56,240 for the median and $66,758 for the average. Census records show that household, family, and personal incomes all place modestly between the 30th and 31st percentiles. The primary income group contains 33.5% of residents (1,236 people) in the $1,500 - 2,999 bracket, which is consistent with the metropolitan area where this segment represents 31.8%. Affordability pressures on housing are highly pronounced, with only of income remaining, placing the suburb in the th percentile.

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Dwelling types in Seacombe Gardens at the time of the latest Census consisted of 57.1% standalone houses and 43.0% other dwelling types including semi-detached houses, apartments, and miscellaneous structures, compared to the Adelaide metro split of 75.2% houses and 24.9% other dwellings. Home ownership in Seacombe Gardens trailed the Adelaide metro average at 23.3%, with the remaining properties occupied by residents with a mortgage (33.0%) or renting (43.7%). The median monthly mortgage payment was higher than the Adelaide metro average at $1,672, while the median weekly rent stood at $370, compared to regional averages of $1,562 and $320 respectively. On a national level, mortgage payments in Seacombe Gardens are much lower than the Australian median of $1,863, while weekly rents are below the national median of $375.

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Family households constitute the majority at 63.1% of all households, consisting of 23.2% couples with children, 23.4% couples without children, and 14.7% single parent families. Non-family living arrangements make up the other 36.9%, with lone-person households accounting for 29.7% and group housing representing 6.9%. The median household size of 2.3 individuals is smaller than the Greater Adelaide average of 2.5.

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The educational profile of the area is distinct within the region, with university qualification levels at 31.7% of residents aged 15 and over, exceeding the SA state average of 25.7% and the SA4 regional figure of 28.1%, showing a strong orientation toward tertiary study. Bachelor degrees are the most common credential at 20.7%, followed by postgraduate degrees at 8.4% and graduate diplomas at 2.6%. Vocational and technical training is also highly represented, with 30.6% of residents aged 15 and over holding trade qualifications, consisting of advanced diplomas at 10.2% and certificates at 20.4%.

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Public transport systems in Seacombe Gardens feature 14 active stops, consisting of bus services. These stops are connected to 30 unique routes, providing a total of 2,220 passenger trips each week. Transport connection is rated as excellent, with residents living an average of 180 meters from their nearest transit stop. Given the suburb's residential nature, most workers commute out of the area, with private cars remaining the primary travel mode at 81%, followed by buses at 8%. Motor vehicle ownership averages 1.1 per household, which is below the regional average. A relatively low 8.5% of residents work from home, based on 2021 Census data which may reflect pandemic-era conditions.

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Health indicators point to below-average outcomes in Seacombe Gardens, according to Districts analyses of mortality statistics and chronic disease prevalence, though the occurrence of common health conditions in the general population is mostly typical, despite being higher than the national average for older age brackets, and the level of private health insurance is relatively low, covering roughly 51% of the population, or about 1,881 people.

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Seacombe Gardens has a high level of cultural diversity, with 30.5% of residents using a language other than English at home and 36.7% born outside Australia. Christianity is the main religion, practiced by 37.2% of the local population. However, the most distinct religious representation is Hinduism, which accounts for 4.8% of the population compared to 2.8% across Greater Adelaide.

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The median age of 34 years in Seacombe Gardens is notably lower than the Greater Adelaide median of 39 and below the national median of 38. Seacombe Gardens shows a high concentration of residents aged 25 - 34 at 20.1% but fewer residents aged 55 - 64 at 8.3% compared to Greater Adelaide. The 25 - 34 cohort representation is substantially higher than the national figure of 14.6%. Since the 2021 Census, the 35 to 44 age cohort increased from 14.2% to 15.7% of the population, whereas the 55 to 64 group decreased from 10.1% to 8.3%. Projections suggest the age structure of Seacombe Gardens will change significantly by with the to group projected to expand by , adding people to reach while the to group will grow by a minor , adding people.

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Seacombe Gardens currently has an estimated 225 children under 5 years old, comprising approximately 125 children aged 0-2 and 84 children aged 3-4. This cohort grew by an estimated 17% since the previous census. while population forecasts indicate future growth, with an anticipated increase of 16% by 2041 (to approximately 260 children). Meanwhile the 5-12 cohort currently amounts to 314. While growth has been positive birth rates observed in the area have been moderate, with approximately 11.6 births per 1,000 residents recorded over the latest two-year period analysed which ranks the area within the middle tier nationally.