Onkaparinga Hills (SA)

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Analysis of population updates from the ABS for the surrounding region, combined with address records verified by Districts since the Census, indicates the population of the suburb of Onkaparinga Hills is approximately 2,634 as of May 2026. This represents a growth of 24 people (0.9%) compared to the 2021 Census, which recorded 2,610 residents. The estimate is derived from a resident count of 2,632, calculated by Districts using the ABS ERP release from June 2025 alongside 27 validated new addresses identified since the Census. This population level translates to a density of 105 persons per square kilometer, indicating low-density living and capacity for future expansion. The primary contributor to local population growth was interstate migration, which accounted for approximately 76.0% of all gains in recent times.

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The employment landscape in Onkaparinga Hills reflects a mix of white and blue collar roles, with strong representation in essential services sectors. The area recorded an unemployment rate of 3.0% and an estimated employment growth of 4.6% over the previous year, according to data aggregated by Districts from statistical area sources. As of March 2026, there were 1,533 residents employed, and the local unemployment rate stood at 0.9% lower than Greater Adelaide's rate of 3.8%. Workforce participation in Onkaparinga Hills was 70.7%, which is moderately higher than the 66.6% rate observed in Greater Adelaide. Census data indicates that only 10.4% of residents worked from home, a figure that may be influenced by the lingering effects of Covid-19 lockdown measures.

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Taxpayer income levels in the suburb of Onkaparinga Hills exceed the national average, according to the latest ATO data aggregated by Districts for financial year 2023. The median income among local taxpayers is $63,246 and the average income is $71,596, compared to Greater Adelaide averages of $54,808 and $66,852 respectively. Factoring in Wage Price Index growth of 10.17% since financial year 2023, current estimates correspond to approximately $69,678 for the median and $78,877 for the average as of March 2026. According to the 2021 Census, weekly household income sits at the 70th percentile ($2,078), while personal income ranks at the 54th percentile. The income distribution reveals that 35.8% of the population (942 individuals) earn between and which is comparable to the wider region where of earners fall into this category. After accounting for housing expenses, residents retain of their income, demonstrating strong purchasing capacity, and the area is positioned in the th decile of the SEIFA index of relative advantage and disadvantage.

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Residential housing in the suburb of Onkaparinga Hills at the time of the latest Census was composed of 99.4% houses and 0.6% other dwelling types like semi-detached properties, apartments, or alternative options, compared to Adelaide metro where houses made up 75.2% and other dwellings accounted for 24.9%. Home ownership rates were notably high at 39.9%, while the remaining homes were either held under a mortgage (55.6%) or rented (4.5%). The median monthly mortgage payment was higher than the Adelaide metro median, recording $1,625 compared to $1,562, while the median weekly rent was $385 compared to Adelaide metro's $320. On a national scale, mortgage commitments are lower than the Australian average of $1,863, while weekly rents exceed the national benchmark of $375.

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Families make up the vast majority of households at 87.0%, consisting of couples with children (42.1%), couples without children (35.9%), and single-parent homes (8.2%). Non-family living arrangements account for the remaining 13.0%, with single-person households representing 11.5% and group households comprising 2.0% of the total. The median household size of 2.9 individuals is larger than the Greater Adelaide average of 2.5.

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Educational profiles indicate lower levels of higher education attainment, with university graduation rates (16.5%) falling well below the national level of 30.4%. Bachelor degrees are the most common higher qualification at 11.2%, followed by postgraduate degrees (3.0%) and graduate diplomas (2.3%). Vocational and technical training is highly prevalent, with 44.6% of residents aged 15 and over possessing vocational qualifications, including advanced diplomas (12.2%) and certificates (32.4%).

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Public transport analysis identifies 4 active transit stops within the suburb of Onkaparinga Hills, serviced by a combination of buses. These stops accommodate 5 separate routes, which provide a combined total of 268 passenger journeys each week. Transport access is rated as moderate, with residents living an average of 441 meters from their nearest transit stop. Given the residential profile, the majority of working residents travel out of the area, with private cars remaining the primary travel mode at 94%. Households own an average of 2.2 vehicles, which is above the regional norm. A low 10.4% of residents worked from home according to the 2021 Census, which may reflect pandemic-related working arrangements.

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Health indicators show positive trends for residents in the suburb of Onkaparinga Hills, with analysis of mortality rates and medical diagnoses by Districts tracking close to national averages. The occurrence of typical medical conditions is standard across both younger and older cohorts, and private health insurance membership is high, covering approximately 55% of the population, or around 1,456 people. This compares to 52.7% of residents across Greater Adelaide.

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Cultural diversity in the suburb of Onkaparinga Hills is below average, with 80.7% of residents born in Australia, 92.7% holding citizenship, and 95.4% speaking only English at home. Christianity is the primary religion, followed by 40.8% of the population. The most pronounced deviation from regional averages is in Judaism, which is practiced by none of the local population, compared to 0.1% across Greater Adelaide.

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The median age of 45 years in the suburb of Onkaparinga Hills is higher than the Greater Adelaide average of 39 years and also sits above the national median of 38 years. The cohort aged 55 to 64 is well represented at 16.0% compared to Greater Adelaide, while the 25 to 34 age bracket is less common at 10.2%. Post-2021 Census figures show the 75 to 84 cohort has expanded from 5.4% to 7.1% of the population, and the 25 to 34 cohort has risen from 9.1% to 10.2%. Conversely, the 5 to 14 age group has shrunk from 12.5% to 11.3%, and the to group has declined from to . Population modeling indicates the local age profile will shift by with the to cohort expected to grow the most at , adding residents to reach while the to cohort is projected to see minimal growth of ( people).

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Onkaparinga Hills currently has an estimated 92 children under 5 years old, comprising approximately 82 children aged 0-2 and 55 children aged 3-4. This cohort declined by an estimated 9% since the previous census. though population forecasts indicate future growth, with an anticipated increase of 23% by 2041 (to approximately 113 children). Meanwhile the 5-12 cohort currently amounts to 233. Birth rates in the area have averaged 10.3 per 1,000 residents over the latest two-year period, a moderate rate (within the middle tier nationally). This rate has slowed down slightly in recent years however.