Flagstaff Hill (SA)

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Based on assessments of ABS population revisions for the broader region alongside fresh address data validated by Districts since the Census, the suburb of Flagstaff Hill has an estimated population of 10,582 as of May 2026. This represents a gain of 398 residents (3.9%) relative to the 2021 Census, when the count stood at 10,184 individuals. The figure is derived from the resident population of 10,574, calculated by Districts using the ABS June 2025 release of ERP data and incorporating 15 validated new addresses since the Census date. With this population level, the density ratio averages 1,346 persons per square kilometer, exceeding the average across Australian areas analyzed by Districts. The suburb's 3.9% Census-to-date expansion trails the wider SA3 area (5.8%) by 1.9 percentage points, showing competitive local growth dynamics. Overseas migration was the primary driver of this demographic expansion, accounting for approximately 71.0% of the net population growth during recent times.

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The suburb of Flagstaff Hill is characterized by a highly educated workforce with strong representation in essential services, an unemployment rate of only 1.5%, and an estimated job growth rate of 5.1% over the past year, according to Districts' regional data aggregation. As of March 2026, working residents numbered 6,150, with the local unemployment rate sitting 2.3 percentage points below the 3.8% registered across Greater Adelaide. Labor force participation stands at 71.1%, compared to 66.6% for Greater Adelaide. Census statistics show a relatively low 12.5% of the workforce worked from home, though this figure may have been affected by COVID-19 restrictions.

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According to Districts' analysis of the latest postcode-level ATO data released for financial year 2023, the suburb of Flagstaff Hill recorded a median taxpayer income of $53,707 and an average income of $62,544. These figures are below the national averages and compare to median and average incomes of $54,808 and $66,852 across Greater Adelaide. Adjusting for Wage Price Index growth of 10.17% since financial year 2023, current estimates for March 2026 stand at approximately $59,169 for the median and $68,905 for the average. Based on the 2021 Census, household, family, and individual incomes in the area sit in the 64th percentile nationally. Income distribution figures show that 36.6% of residents (representing 3,873 people) fall into the $1,500 - 2,999 weekly bracket, similar to the recorded across the metropolitan area. After accounting for housing costs, residents retain of their income, which indicates strong purchasing power, while the area's SEIFA income index places it in the th decile.

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Residential structures in the suburb of Flagstaff Hill, as recorded in the latest Census, consisted of 96.5% separate houses and 3.5% other housing types (including townhouses, apartments, and alternative structures), compared to 75.2% houses and 24.9% other dwellings across metropolitan Adelaide. Home ownership rates were significantly higher than the metropolitan average at 39.0%, with the remaining properties occupied by mortgage holders (50.5%) or rented (10.5%). The median monthly mortgage payment of $1,733 was well above the metropolitan average of $1,562, while the median weekly rent of $385 also exceeded the Adelaide average of $320. In a national context, mortgage repayments in the suburb of Flagstaff Hill are below the Australian median of $1,863, whereas weekly rents exceed the national benchmark of $375.

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Family households represent the vast majority of local homes at 83.2%, consisting of couples with children at 40.1%, couples without children at 33.7%, and single parent families at 8.3%. Non-family households account for the remaining 16.8%, with single-person households representing 15.6% and group housing making up 1.5% of all households. The median household size is 2.7 occupants, which is larger than the Greater Adelaide average of 2.5.

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Educational attainment in the suburb of Flagstaff Hill is high compared to regional benchmarks, with 30.4% of residents aged 15+ holding a university degree, compared to 18.9% in the surrounding SA3 region. This education profile positions the suburb well for professional opportunities. Among tertiary graduates, Bachelor degrees are the most common at 20.4%, followed by postgraduate qualifications (6.6%) and graduate diplomas (3.4%). Vocational and technical training is also highly represented, with 35.3% of residents aged 15+ holding vocational qualifications, including advanced diplomas (12.3%) and certificates (23.0%).

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Public transport infrastructure includes 38 active stops located within the suburb of Flagstaff Hill, offering bus services. These stops support 23 unique routes, generating a total of 646 weekly passenger journeys. Accessibility is classified as favorable, with the typical resident residing 331 meters from their nearest transit point. The suburb's residential nature means most workers travel out of the area for employment, with private cars remaining the primary commuting choice at 90%. Average motor vehicle ownership stands at 1.9 cars per household, exceeding the metropolitan average. A relatively modest 12.5% of working residents worked from home, according to the 2021 Census, which may reflect pandemic-era conditions.

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Assessments of local health data indicate favorable outcomes across the suburb of Flagstaff Hill, based on Districts' study of mortality rates and chronic illness prevalence, showing low rates of common health conditions across all age cohorts. Private health insurance coverage is held by a relatively modest proportion of the population, at approximately 52% (about 5,474 people).

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The suburb of Flagstaff Hill exhibits greater cultural diversity than most comparable markets, with 13.6% of residents using a language other than English at home and 28.4% born overseas. Christianity represents the leading religious affiliation, accounting for 42.9% of residents. The most pronounced religious overrepresentation occurs in Judaism, which is practiced by 0.2% of the population compared to 0.1% across Greater Adelaide.

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The median age in the suburb of Flagstaff Hill is 43 years, placing it significantly above the Greater Adelaide average of 39 and the Australian average of 38 years. Compared to Greater Adelaide, the suburb has an elevated proportion of residents aged 75 - 84 (8.6%) and a lower share of young adults aged 25 - 34 (9.5%). Since the 2021 Census, the proportion of residents in the 75 to 84 bracket has increased from 5.8% to 8.6%. Over the same period, the 45 to 54 group declined from 14.2% to 12.9%, and the 65 to 74 group fell from 12.5% to 11.4%. Looking forward to demographic projections point to changes in the age profile, led by a increase in the + cohort (adding people to reach up from ). In contrast, the cohort aged to is expected to decrease by people.

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Flagstaff Hill currently has an estimated 507 children under 5 years old, comprising approximately 301 children aged 0-2 and 202 children aged 3-4. This cohort declined by an estimated 0% since the previous census. though population forecasts indicate future growth, with an anticipated increase of 5% by 2041 (to approximately 531 children). Meanwhile the 5-12 cohort currently amounts to 1,032. Birth rates in the area have averaged 8.8 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.