Seaford Heights (SA)

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According to ABS demographic updates for the surrounding region and recent home addresses verified by Districts since the Census, the suburb of Seaford Heights has a resident count of approximately 2,438 as of May 2026. This represents a growth of 1,359 people (125.9%) from the 2021 Census, which counted 1,079 individuals. The estimate is based on a resident figure of 2,403 determined by Districts using the latest ABS ERP release (June 2025) plus 393 verified new addresses registered after the Census. This population level results in a density of 1,409 persons per square kilometer, exceeding the typical ratio across national locations tracked by Districts. The 125.9% expansion rate of the suburb of Seaford Heights since the 2021 census outpaced the SA3 area (5.8%) and the broader SA4 region, making it a regional growth leader. The primary driver of this growth was interstate migration, accounting for roughly of population increases, with overseas arrivals and natural increase also making positive contributions.

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Seaford Heights features a highly qualified labor pool with strong representation in essential services, an unemployment rate of 0.5%, and estimated employment growth of 17.0% over the previous year according to Districts aggregated statistical area data. By March 2026, the area had 1,591 residents employed, with an unemployment rate of 3.3% that sits 0.5 percentage points lower than Greater Adelaide's 3.8%, and workforce participation reached 85.6% which exceeds Greater Adelaide's 66.6%. Census data indicates that only 9.4% of residents worked from home, although the lingering effects of Covid-19 lockdowns should be taken into account.

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Taxpayer data from the ATO compiled by Districts for the 2023 financial year shows that the suburb of Seaford Heights has a very high income profile relative to the rest of the nation. The median taxpayer income is $68,945 and the average stands at $85,216, compared to Greater Adelaide averages of $54,808 and $66,852. Adjusting for a 10.17% increase in the Wage Price Index since the 2023 financial year, current estimates would be approximately $75,957 for the median and $93,882 for the average as of March 2026. Census data places household, family, and individual incomes in the suburb of Seaford Heights between the 76th and 85th percentiles nationally. In terms of distribution, 51.7% of the community (1,260 people) earn between $1,500 and $2,999, which is higher than the metropolitan rate of in the same bracket. High housing costs account for of income, but strong wages keep disposable income at the th percentile nationally, placing the area in the th decile of the SEIFA income index.

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Residential structures in Seaford Heights at the time of the latest Census consisted of 94.9% standalone houses and 5.1% other options like townhouses and apartments, compared to 75.2% houses and 24.9% other dwellings across metropolitan Adelaide. Home ownership rates in Seaford Heights lagged behind the metropolitan average, sitting at 10.2%, with the remaining properties being mortgaged (67.0%) or rented (22.8%). The median monthly mortgage payment of $1,733 was notably higher than the Adelaide metro average of $1,562, while the median weekly rent of $380 exceeded the metropolitan average of $320. Nationally, mortgage costs in Seaford Heights are below the Australian average of $1,863, while weekly rents exceed the national benchmark of $375.

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Families make up 81.4% of all local households, consisting of couples with children at 37.2%, couples without children at 33.6%, and single parent households at 9.2%. The remaining 18.6% are non-family households, including single person households at 16.8% and group living situations at 1.7%. The median household occupancy of 2.6 residents is slightly higher than the Greater Adelaide average of 2.5.

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The educational profile of the area is distinct, with university attainment rates for residents aged 15 and over sitting at 25.0%, compared to the SA3 average of 18.9%, showing a strong focus on tertiary education. Bachelor degrees are the most common higher qualification at 17.5%, with postgraduate degrees at 4.7% and graduate diplomas at 2.8%. Vocational qualifications are also highly prevalent, with 41.8% of residents aged 15 and over holding technical credentials, consisting of advanced diplomas (9.2%) and certificates (32.6%).

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Public transport services in the suburb of Seaford Heights consist of 2 active transit stops offering bus options. These stops are serviced by 4 different routes, providing 145 weekly passenger trips. Transport access is rated as good, with residents living an average of 395 meters from their nearest stop. Because this is a residential suburb, the majority of commuters travel outside the area, with private cars remaining the primary mode of travel at 91%, followed by trains at 7%. Household vehicle ownership averages 1.6 cars, which is higher than the regional average. A low 9.4% of residents worked from home, according to the 2021 Census, which may have been influenced by COVID-19 restrictions.

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Health indicators are positive for Seaford Heights residents, with analysis of mortality rates and chronic illnesses showing results in line with national averages, and normal rates of typical health issues across both younger and older cohorts. Private health insurance coverage is high, with roughly 61% of the population (1,477 residents) holding policies, compared to 52.7% across Greater Adelaide.

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Seaford Heights displays a higher level of cultural diversity than average, with 12.3% of residents speaking a non-English language at home and 26.6% born outside Australia. Christianity is the primary religion, followed by 31.4% of the population. The most pronounced overrepresentation is in the Other category, which represents 1.9% of residents, compared to 1.8% across Greater Adelaide.

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With a median age of 31, the suburb of Seaford Heights has a much younger population than Greater Adelaide where the median is 39, and is also younger than the national median of 38 years. Compared to Greater Adelaide, the suburb of Seaford Heights has a higher proportion of residents aged 25 to 34 (24.1%) but fewer seniors aged 65 to 74 (5.0%). This concentration of 25 to 34 year-olds is significantly higher than the national average of 14.6%. Since the 2021 Census, the median age has risen by 2.0 years, increasing from 29 to 31. The 55 to 64 age group expanded from 5.2% to 8.0%, and the to cohort grew from to . Meanwhile, the to age group decreased from to , and the to group fell from to . Projections indicate that by the age structure of the suburb of Seaford Heights will change, with the to age group expected to grow by people (), rising from to .

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Seaford Heights currently has an estimated 241 children under 5 years old, comprising approximately 87 children aged 0-2 and 58 children aged 3-4. This cohort grew by an estimated 104% since the previous census. while population forecasts indicate future growth, with an anticipated increase of 23% by 2041 (to approximately 297 children). Meanwhile the 5-12 cohort currently amounts to 229. While growth has been positive birth rates observed in the area have been moderate, with approximately 9.1 births per 1,000 residents recorded over the latest two-year period analysed which ranks the area within the middle tier nationally.