Seacliff (SA)

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According to evaluations of ABS demographics data for the region alongside updated street locations validated by Districts after the Census, the suburb of Seacliff has an estimated resident base of 2,101 in May 2026. This represents a contraction of 16 individuals (0.8%) relative to the 2021 Census, which counted 2,117 residents. The shift is based on a localized population estimate of 2,097, calculated by Districts using the ABS June 2025 release of estimated resident numbers combined with subsequent property location updates. This total translates to a density of 2,878 persons per square kilometer, placing the suburb of Seacliff in the top quarter of Australian locations analyzed by Districts. Inward migration from international sources served as virtually the sole contributor to local population additions over the recent term.

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A highly qualified workforce characterizes Seacliff, alongside strong representation in crucial service sectors, a low jobless rate of 2.6%, and estimated annual jobs growth of 3.4% derived from localized area statistics. Working residents numbered 1,160 as of March 2026, while local unemployment sits 1.2% lower than the 3.8% recorded across Greater Adelaide. Labor market participation matches the regional average of 66.6% closely. Census records indicate a moderate 18.7% of the workforce operated from home, though this figure was influenced by pandemic-related restrictions.

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According to the latest postcode-level taxation records aggregated by Districts for financial year 2023, Seacliff taxpayers recorded a median income of $62,396 and a mean income of $82,993. These figures rank highly on a national scale, comparing to a median of $54,808 and an average of $66,852 across Greater Adelaide. Adjusting for a 10.17% rise in the Wage Price Index since financial year 2023 yields estimated values of approximately $68,742 for the median and $91,433 for the average as of March 2026. Census figures from 2021 place local household, family, and individual incomes in the 67th percentile nationwide. The most common income bracket comprises 29.7% of households earning between $1,500 - 2,999 weekly, representing 623 residents and aligning with the Greater Adelaide proportion of . Higher-income households are well represented, with earning more than weekly, highlighting strong local purchasing power. Residents retain of their earnings after servicing housing costs, and the local SEIFA socioeconomic status rank sits in the th decile.

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Residential property forms in Seacliff at the time of the last Census consisted of 66.3% separate houses and 33.8% alternative dwellings such as townhouses and flats, compared to Adelaide metro ratios of 75.2% and 24.9% respectively. Home ownership rates were notably higher than the metropolitan benchmark, standing at 41.8%, while mortgaged properties accounted for 33.5% and rented residences made up 24.6%. The median monthly mortgage cost was $1,950, considerably higher than the Adelaide metro average of $1,562. The median weekly rental cost was $350, compared to $320 across the Adelaide metro area. Nationally, local mortgage commitments exceed the Australian average of $1,863, whereas rental costs remain below the countrywide median of $375.

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Families make up 72.9% of all local households, consisting of couples with offspring at 28.7%, couples without children at 34.1%, and single-parent homes at 10.1%. The remaining 27.1% are non-family arrangements, with single-person households representing 24.2% and group houses comprising 2.4%. The average household size of 2.4 residents sits slightly under the Greater Adelaide average of 2.5.

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Residents of Seacliff hold higher qualifications than the wider region, with 43.5% of people aged 15+ possessing university degrees, compared to 25.7% across SA and 28.1% within the SA4 territory. This high concentration of degrees equips the population for knowledge-intensive sectors. Undergraduate degrees are held by 27.7% of residents, followed by postgraduate degrees at 11.4% and graduate diplomas at 4.4%. Vocational education is also common, with 30.1% of those aged 15+ holding technical credentials, consisting of advanced diplomas at 12.3% and certificates at 17.8%.

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Public transit records show 13 active transit connections located in Seacliff, providing a combination of rail and bus services. These stops are served by 12 different routes, which provide a total of 1,127 passenger trips every week. Accessibility is high, with residents living an average of 169 meters from their nearest transit point. Because the area is mainly residential, most workers travel out of the suburb, with private cars being the primary mode of travel for 84% of workers, and trains used by 10%. Average vehicle ownership is 1.4 per home. About 18.7% of residents worked from home, according to the 2021 Census, which was influenced by pandemic conditions.

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Health indicators show excellent results in Seacliff, based on analysis of mortality statistics and long-term health issues, which show low rates of standard illnesses across all age brackets. Private health insurance coverage is high, encompassing roughly 60% of the population, which represents 1,255 people, compared to 52.7% across Greater Adelaide.

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Seacliff shows similar levels of cultural diversity to the wider metropolitan area, with 76.2% of residents born in Australia, 89.7% holding citizenship, and 91.9% speaking only English at home. Christianity is the main religious affiliation, representing 41.4% of the population. The most visible divergence is in the proportion of Islamic adherents, who make up 0.7% of the community compared to 3.0% across Greater Adelaide.

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The median age in Seacliff is 46 years, which is higher than the Greater Adelaide median of 39 and the Australian median of 38 years. Residents aged 65 - 74 represent a large portion of the population at 14.7%, while the 25 - 34 bracket is smaller at 10.6% than in Greater Adelaide. The proportion of 65 - 74 year-olds is higher than the national average of 9.4%. Since 2021, the 75 to 84 bracket has increased from 5.4% to 7.9%, and the 15 to 24 group has risen from 9.7% to 11.3%. In contrast, the 55 to 64 group has decreased from to . Demographic projections for indicate shifts, with the to cohort expected to grow by , adding residents to reach while the to age bracket is projected to decrease by .

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Seacliff currently has an estimated 115 children under 5 years old, comprising approximately 48 children aged 0-2 and 32 children aged 3-4. This cohort grew by an estimated 7% since the previous census. while population forecasts indicate future growth, with an anticipated increase of 3% by 2041 (to approximately 119 children). Meanwhile the 5-12 cohort currently amounts to 165. While growth has been positive birth rates observed in the area have been low, with approximately 7.2 births per 1,000 residents recorded over the latest two-year period analysed which ranks the area among the bottom 20% of areas assessed nationally.