Hindmarsh Island (SA)

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According to evaluations of ABS demographics for the surrounding region and address data verified by Districts subsequent to the Census, the suburb of Hindmarsh Island has an estimated population of 2,496 as of May 2026. This represents an expansion of 650 people (35.2%) compared to the 2021 Census, which counted 1,846 residents. The change is calculated from a resident base of 2,474, which was determined by Districts using the ABS ERP release from June 2025 alongside 261 validated new addresses registered after the Census. This population level yields a density of 37 persons per square kilometer, which represents a spacious living environment. The growth rate of 35.2% since the 2021 census outstripped the Rest of SA (5.9%) and the SA4 region, establishing the area as a regional growth leader. This population expansion was mostly fueled by interstate migration, which accounted for approximately 83.0% of the overall population rise in recent times.

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The suburb of Hindmarsh Island has a skilled workforce across a variety of sectors, showing an unemployment rate of just 3.7% and estimated job growth of 9.0% over the past year based on statistical area aggregations. As of March 2026, there are 994 employed residents, with the unemployment rate sitting 1.8% below the Regional SA mark of 5.5%, whereas workforce participation is notably lower (46.2% compared to 58.4% in Regional SA). Census records indicate a moderate 14.0% of the workforce operated from home, though this figure may have been influenced by Covid-19 restrictions.

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The most recent ATO postcode records for the financial year 2023 show that personal incomes in the suburb of Hindmarsh Island are below the national average, with a median of $40,815 and an average of $54,804. This compares to Regional SA medians of $48,920 and averages of $58,933. Adjusted for a Wage Price Index rise of 10.17% since the financial year 2023, current estimates stand at approximately $44,966 for the median and $60,378 for the average as of March 2026. The 2021 Census reports that household, family, and individual incomes all fall between the 8th and 9th national percentiles. The most common weekly income bracket is $800 - 1,499, accounting for 35.3% of residents (881 people), whereas in the metropolitan area the most common bracket is - at . Despite low housing costs leaving residents with of their income, total disposable income sits in the th national percentile.

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Residential structures in the suburb of Hindmarsh Island at the time of the Census consisted of 87.8% separate houses and 12.2% alternative options like townhouses and apartments, compared to 88.5% houses and 11.5% alternative options in Regional SA. Home ownership rates were high at 54.8%, with mortgaged properties making up 24.2% and rented properties accounting for 21.0%. The median monthly mortgage payment of $1,365 was higher than the Regional SA average of $1,153, while the median weekly rent was $330 compared to $220. At a national level, mortgage payments are lower than the Australian average of $1,863, and weekly rents are also well below the national median of $375.

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Families make up 73.9% of households in the area, consisting of couples with children at 14.9%, couples without children at 50.1%, and single parents at 8.6%. The remaining 26.1% are non-family households, with single-person households at 22.6% and group households at 3.2%. The median household size of 2.2 residents is slightly smaller than the Regional SA average of 2.3.

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The area experiences low levels of tertiary education, with university qualification rates at 18.7% compared to the national rate of 30.4%. Among these qualifications, bachelor degrees are the most common at 12.9%, followed by postgraduate degrees at 3.2% and graduate diplomas at 2.6%. Vocational and technical training is common, with 42.1% of residents aged 15+ holding a vocational qualification, consisting of advanced diplomas at 13.8% and certificates at 28.3%.

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Health indicators are positive for the residents, with mortality rates and chronic illnesses matching national averages. The prevalence of common illnesses remains low among younger and older demographics. The rate of private health insurance is low, with approximately 49% of the population (~1,215 people) covered, compared to the national average of 55.7%.

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Hindmarsh Island demonstrated lower than average cultural diversity, as 77.2% of its residents were born in Australia, 91.3% held citizenship, and 97.1% used only English in their households. Christianity was the predominant faith, representing 44.4% of the population within Hindmarsh Island. Yet the most noticeable overrepresentation occurred in Judaism, which accounted for 0.2% of the population, while Regional SA recorded 0.0%.

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The median age of 60 in the suburb of Hindmarsh Island is higher than the Regional SA average of 47 and the national average of 38. The 65 - 74 age group is the most common cohort at 25.5%, while the 25 - 34 cohort is small at 5.5% (compared to Regional SA). This concentration of 65 - 74 year-olds is higher than the national rate of 9.4%. Since the 2021 Census, the 75 to 84 cohort has increased from 11.2% to 14.1% of the population, and the 85+ cohort has increased from 2.0% to 4.0%. The 55 to 64 cohort declined from to , and the to cohort fell from to . By demographic shifts are expected, with the + cohort projected to grow by , adding residents to total . The + age groups will account for of total population growth, while the to and to cohorts are expected to decrease in size.

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Hindmarsh Island currently has an estimated 69 children under 5 years old, comprising approximately 39 children aged 0-2 and 26 children aged 3-4. This cohort grew by an estimated 47% since the previous census. while population forecasts indicate future growth, with an anticipated increase of 7% by 2041 (to approximately 74 children). Meanwhile the 5-12 cohort currently amounts to 143. While growth has been positive birth rates observed in the area have been low, with approximately 4.7 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. This rate has slowed down slightly in recent years however.