Semaphore Park (SA)

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Based on analysis of ABS population updates for the broader area, and new addresses validated by Districts since the Census Semaphore Park's population is estimated at around 4,391 as of May 2026. This reflects a decrease of 150 people (3.3%) since the 2021 Census, which reported a population of 4,541 people. The change is inferred from the resident population of 4,385, estimated by Districts following examination of the latest ERP data release by the ABS (June 2025) and an additional 27 validated new addresses since the Census date. This level of population equates to a density ratio of 2,299 persons per square kilometer, which is above the average seen across national locations assessed by Districts. Population growth for the area was primarily driven by overseas migration that contributed approximately 54.0% of overall population gains during recent periods.

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Semaphore Park possesses a skilled workforce, with essential services sectors well represented, an unemployment rate of 4.1%, and 5.0% in estimated employment growth over the past year, based on Districts aggregation of statistical area data. As of March 2026, 2,072 residents are in work while the unemployment rate is 0.3% above Greater Adelaide's rate of 3.8%, and workforce participation lags significantly (58.9% compared to Greater Adelaide's 66.6%). Based on Census responses, a low 12.3% of residents were found to work from home, though Covid-19 lockdown impacts should be considered.

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Districts' latest postcode level ATO data for financial year 2023 reveals that income in the suburb of Semaphore Park is below the national average, with the median assessed at $46,765 while the average income stands at $62,382. This contrasts to Greater Adelaide's figures of a median income of $54,808 and an average income of $66,852. Based on Wage Price Index growth of 10.17% since financial year 2023, current estimates would be approximately $51,521 (median) and $68,726 (average) as of March 2026. From the 2021 Census, household, family and personal incomes in Semaphore Park all fall between the 17th and 20th percentiles nationally. Income brackets indicate 25.8% of the population (1,132 individuals) fall within the $1,500 - 2,999 income range, aligning with the surrounding region where this cohort likewise represents . Housing affordability pressures are severe, with only of income remaining, ranking at the th percentile and the area's SEIFA income ranking places it in the th decile.

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Dwelling structure within Semaphore Park, as evaluated at the latest Census, comprised 54.0% houses and 46.0% other dwellings (semi-detached, apartments, 'other' dwellings), in comparison to Adelaide metro's 75.2% houses and 24.9% other dwellings. Meanwhile, the level of home ownership within Semaphore Park was in line with that of Adelaide metro, at 30.9%, with the remainder of dwellings either mortgaged (30.2%) or rented (38.9%). The median monthly mortgage repayment in the area was well above the Adelaide metro average at $1,786, while the median weekly rent figure was recorded at $250, compared to Adelaide metro's $1,562 and $320. Nationally, Semaphore Park's mortgage repayments are lower than the Australian average of $1,863, while rents are substantially below the national figure of $375.

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Family households dominate at 60.9% of all households, comprising 22.1% couples with children, 24.5% couples without children, and 13.2% single parent families. Non-family households make up the remaining 39.1%, with lone person households at 36.4% and group households comprising 2.6% of the total. The median household size of 2.2 people is smaller than the Greater Adelaide average of 2.5.

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Educational qualifications in Semaphore Park trail regional benchmarks, with 22.1% of residents aged 15+ holding university degrees compared to 30.4% in Australia. This gap highlights potential for educational development and skills enhancement. Bachelor degrees lead at 15.9%, followed by postgraduate qualifications (4.2%) and graduate diplomas (2.0%). Trade and technical skills feature prominently, with 35.7% of residents aged 15+ holding vocational credentials – advanced diplomas (10.3%) and certificates (25.4%).

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Public transport analysis reveals 25 active transport stops operating within Semaphore Park comprising a mix of buses. These stops are serviced by 12 individual routes, collectively providing 411 weekly passenger trips. Transport accessibility is rated as excellent, with residents typically located 155 meters from the nearest transport stop. As a primarily residential area, most residents commute outward - car remains the dominant mode at 91%. Vehicle ownership averages 1.1 per dwelling, below the regional average. A relatively low 12.3% of residents work from home (2021 Census; may reflect COVID-19 conditions).

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Health data reveals substantial challenges facing Semaphore Park, based on Districts' assessment of mortality rates and chronic condition prevalence with prevalence of common health conditions notable across both younger and older age cohorts , and the rate of private health cover found to be relatively low at approximately 52% of the total population (~2,268 people).

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Semaphore Park was found to be roughly in line with the wider region's average in terms of cultural diversity, with 79.2% of its population born in Australia, 88.8% being citizens, and 89.3% speaking English only at home. The main religion in Semaphore Park was found to be Christianity, which makes up 46.0% of people in Semaphore Park. However, the most apparent overrepresentation was in Islam, which comprises 1.2% of the population, compared to 3.0% across Greater Adelaide.

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At 46 years, Semaphore Park's median age is significantly above the Greater Adelaide average of 39 similarly considerably older than Australia's 38 years. The age profile shows 75 - 84 year-olds are particularly prominent (10.0%), while the 25 - 34 group is comparatively smaller (11.3%) than in Greater Adelaide. In the period since 2021, the 75 to 84 age group has grown from 7.5% to 10.0% of the population. Conversely, the 65 to 74 cohort has declined from 13.8% to 11.8% and the 55 to 64 group dropped from 13.4% to 11.8%. Population forecasts for indicate substantial demographic changes for Semaphore Park. The + cohort shows the strongest projected growth at , adding residents to reach . Senior residents (+) will drive of population growth, underscoring demographic aging trends. On the other hand, population declines are projected for the to and to cohorts.

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Semaphore Park currently has an estimated 254 children under 5 years old, comprising approximately 108 children aged 0-2 and 72 children aged 3-4. This cohort grew by an estimated 4% since the previous census. though population forecasts indicate future decline, with an anticipated decrease of 2% by 2041 (to approximately 248 children). Meanwhile the 5-12 cohort currently amounts to 334. While growth has been positive birth rates observed in the area have been low, with approximately 7.7 births per 1,000 residents recorded over the latest two-year period analysed which ranks the area among the bottom 30% of areas assessed nationally.