Semaphore

Semaphore has shown very soft population growth performance across periods assessed by AreaSearch

Based on ABS population updates and AreaSearch validation, the estimated population of Semaphore as of May 2026 is around 2,814. This reflects an increase of 65 people since the 2021 Census, which reported a population of 2,749. The change is inferred from AreaSearch's resident population estimate of 2,810 following examination of ABS ERP data release in June 2025 and additional 12 validated new addresses since the Census date. This results in a density ratio of 2,654 persons per square kilometer, placing Semaphore in the upper quartile relative to national locations assessed by AreaSearch. Overseas migration contributed approximately 69.0% of overall population gains during recent periods, with all drivers including interstate migration and natural growth being positive factors.

AreaSearch adopts ABS/Geoscience Australia projections for each SA2 area, released in 2024 with a base year of 2022. For areas not covered by this data and years post-2032, the SA State Government's Regional/LGA projections by age category are adopted, based on 2021 data and released in 2023. Demographic trends indicate a population increase just below the median of statistical areas analysed by AreaSearch to 2041, with Semaphore expected to increase by 221 persons, reflecting an increase of 7.7% over the 16 years.

AreaSearch assessment of residential development drivers sees a low level of activity in Semaphore, placing the area among the bottom 25% of areas assessed nationally

AreaSearch analysis of ABS building approval numbers allocated from statistical area data shows Semaphore experienced approximately 5 dwelling approvals annually over the past 5 financial years, totalling an estimated 27 homes. As of FY-26, 18 approvals have been recorded. On average, around 0.7 people moved to the area per year for each dwelling built between FY-21 and FY-25, indicating supply met or exceeded demand. The average construction value was $419,000, suggesting a focus on premium properties.

This financial year saw $894,000 in commercial approvals, predominantly residential. Compared to Greater Adelaide, Semaphore had 77.0% fewer dwelling approvals per person. Recent construction comprised 33.0% detached dwellings and 67.0% townhouses or apartments, a shift from the current housing mix of 65.0% houses. Semaphore had approximately 560 people per dwelling approval as of FY-25. Population forecasts indicate an increase of 217 residents by 2041. If development rates continue at their current pace, housing supply may not keep up with population growth.

Population forecasts indicate Semaphore will gain 217 residents through to 2041 (from the latest AreaSearch quarterly estimate). If current development rates continue, housing supply may not keep pace with population growth, potentially increasing competition among buyers and supporting stronger price growth.

Semaphore has emerging levels of nearby infrastructure activity, ranking in the 32ndth percentile nationally

No changes can significantly impact an area's performance like modifications to local infrastructure, major projects, or planning initiatives. AreaSearch has identified zero projects that are expected to affect this area. Notable projects include Centre Street in Largs Bay, Our Port, Coast Park Linear Park from Semaphore Park to West Lakes Shore (Stage 1), and the Charles Sturt Playground Renewal Program. The following list provides details on those most likely to be relevant.

Professional plan users can use the search below to filter and access additional projects.

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The labour market in Semaphore shows considerable strength compared to most other Australian regions

Semaphore has an educated workforce with significant representation in essential services sectors. Its unemployment rate was 2.9% as of the past year, showing a 5.5% employment growth based on AreaSearch data aggregation. As of December 2025, 1,687 residents were employed, with an unemployment rate of 0.9% lower than Greater Adelaide's 3.8%.

Workforce participation was 68.8%, slightly higher than Greater Adelaide's 66.0%. According to Census responses, 14.4% of residents worked from home, potentially influenced by Covid-19 lockdowns. Dominant employment sectors included health care & social assistance, education & training, and public administration & safety, with the latter being particularly notable at 1.3 times the regional average. Construction had a limited presence at 6.7%, compared to the regional average of 8.7%.

The predominantly residential area offered limited local employment opportunities. Over a 12-month period ending in May-25, Semaphore's employment increased by 5.5% and labour force by 4.4%, decreasing the unemployment rate by 1.0 percentage points. In contrast, Greater Adelaide experienced lower growth rates. National employment forecasts from Jobs and Skills Australia project a 6.6% increase over five years and 13.7% over ten years. Applying these projections to Semaphore's employment mix suggests local employment should increase by 6.6% in five years and 13.8% in ten years, though this is a simplified extrapolation for illustrative purposes only.

Income levels align closely with national averages, indicating typical economic conditions for Australian communities according to AreaSearch analysis

According to AreaSearch's aggregation of ATO data released on 30 June 2023 for financial year 2023, Semaphore had a median income among taxpayers of $56,795 and an average level of $67,101. These figures are in line with national averages and compare to levels of $54,808 and $66,852 across Greater Adelaide respectively. Based on Wage Price Index growth of 10.17% since financial year 2023, current estimates would be approximately $62,571 (median) and $73,925 (average) as of March 2026. From the 2021 Census, household, family and personal incomes in Semaphore cluster around the 54th percentile nationally. Looking at income distribution, 30.9% of locals (869 people) fall into the $1,500 - 2,999 category, consistent with broader trends across the surrounding region showing 31.8% in the same category. After housing costs, 86.5% of income remains for other expenses and Semaphore's SEIFA income ranking places it in the 6th decile.

Semaphore displays a diverse mix of dwelling types, with above-average rates of outright home ownership

Semaphore's dwelling structures, as per the latest Census, consisted of 65.4% houses and 34.5% other dwellings (semi-detached, apartments, 'other' dwellings), compared to Adelaide metro's 75.2% houses and 24.9% other dwellings. Home ownership in Semaphore was at 35.9%, with mortgaged dwellings at 33.6% and rented ones at 30.5%. The median monthly mortgage repayment in the area was $1,733, higher than Adelaide metro's average of $1,562. The median weekly rent figure for Semaphore was $320, matching Adelaide metro's figure but lower than the national average of $375. Nationally, Semaphore's mortgage repayments were below the Australian average of $1,863.

Semaphore features high concentrations of lone person households, with a lower-than-average median household size

Family households constitute 65.0% of all households, including 22.9% couples with children, 30.0% couples without children, and 10.1% single parent families. Non-family households comprise the remaining 35.0%, with lone person households at 31.8% and group households at 3.4%. The median household size is 2.2 people, smaller than the Greater Adelaide average of 2.5.

The educational profile of Semaphore exceeds national averages, with above-average qualification levels and academic performance metrics

Semaphore's educational attainment exceeds broader benchmarks. Among residents aged 15+, 33.2% hold university qualifications, compared to SA3 area's 22.6% and South Australia's 25.7%. Bachelor degrees are the most common (20.2%), followed by postgraduate qualifications (8.9%) and graduate diplomas (4.1%). Vocational credentials are also prominent, with 34.5% of residents aged 15+ holding such qualifications - advanced diplomas at 11.8% and certificates at 22.7%.

Notably, 24.3% of the population is actively pursuing formal education, including 7.7% in primary education, 6.5% in tertiary education, and 5.6% in secondary education.

Transport servicing is moderate compared to other areas nationally based on assessment of service frequency, route connectivity and accessibility

Semaphore has 14 active public transport stops, all of which are bus stops. These stops are served by 11 different routes that together facilitate 247 weekly passenger trips. The accessibility of these transport services is rated as excellent, with residents on average located just 167 meters from the nearest stop. Most residents in this primarily residential area commute outwards. Car remains the dominant mode of transportation, used by 87% of residents, while cycling accounts for 2%. On average, there are 1.2 vehicles per dwelling, which is below the regional average.

According to the 2021 Census, 14.4% of Semaphore's residents work from home, a figure that may have been influenced by COVID-19 conditions. The service frequency averages 35 trips per day across all routes, equating to approximately 17 weekly trips per individual stop.

Health outcomes in Semaphore are marginally below the national average with the level of common health conditions among the general population somewhat typical, though higher than the nation's average among older cohorts

Semaphore's health indicators show below-average outcomes based on AreaSearch's assessment as of 2021.

Mortality rates and chronic condition prevalence are somewhat typical but higher than the national average among older cohorts. Private health cover is at approximately 54% of the total population, which is slightly above the average SA2 area. The most common medical conditions in Semaphore are mental health issues (10.0%) and arthritis (9.0%), while 62.5% of residents report being completely clear of medical ailments compared to 67.9% across Greater Adelaide. The working-age population faces notable health challenges due to elevated chronic condition rates. As of 2021, Semaphore has a higher proportion of residents aged 65 and over (23.2%, or 652 people) than Greater Adelaide (19.2%). Health outcomes among seniors present some challenges but rank lower nationally compared to the broader population.

In terms of cultural diversity, Semaphore records figures broadly comparable to the national average, as found in AreaSearch's assessment of a number of language and cultural background related metrics

Semaphore's population was found to align with the broader area's average in terms of cultural diversity, with 77.0% born in Australia, 88.9% being citizens, and 91.5% speaking English only at home. Christianity was the predominant religion, making up 39.7% of Semaphore's population. Islam, however, was more prevalent than average, comprising 1.2%, compared to Greater Adelaide's 3.0%.

The top three ancestral groups were English (30.9%), Australian (21.9%), and Irish (9.1%). Notably, Polish (1.3%) and German (6.0%) populations were higher than the regional averages of 1.0% and 5.1%, respectively. Dutch ancestry was also somewhat overrepresented at 2.0%, compared to the regional average of 1.2%.

Semaphore ranks among the oldest 10% of areas nationwide

Semaphore's median age is 50, which is higher than Greater Adelaide's figure of 39 and the national norm of 38. The 55-64 age group makes up 20.8% of Semaphore's population, compared to Greater Adelaide's percentage, while the 25-34 cohort comprises 9.3%. This 55-64 concentration is notably higher than the national figure of 11.2%. Post-2021 Census data shows that the 75-84 age group grew from 5.0% to 7.0%, and the 65-74 cohort increased from 13.3% to 14.7%. Conversely, the 45-54 cohort declined from 17.4% to 14.9%. By 2041, Semaphore is expected to experience significant shifts in its age composition. The 75-84 group is projected to grow by 47%, reaching 289 from 196. This growth will be led by those aged 65 and above, who are expected to comprise 71% of the projected population increase. Conversely, population declines are projected for the 0-4 and 15-24 age groups.