Semaphore

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

Based on analysis of ABS population updates for the broader area, the estimated population of the suburb of Semaphore is around 2,842 as of Feb 2026. This reflects an increase of 93 people since the 2021 Census, which reported a population of 2,749 people. The change is inferred from the resident population of 2,814 estimated by AreaSearch following examination of the latest ERP data release by the ABS in June 2024 and an additional 11 validated new addresses since the Census date. This level of population equates to a density ratio of 2,681 persons per square kilometer, placing it in the upper quartile relative to national locations assessed by AreaSearch. Population growth for the area was primarily driven by overseas migration that contributed approximately 69.0% of overall population gains during recent periods.

AreaSearch is adopting ABS/Geoscience Australia projections for each SA2 area, as released in 2024 with a base year of 2022. For any SA2 areas not covered by this data, and for years post-2032, the SA State Government's Regional/LGA projections by age category are adopted with adjustments made employing a method of weighted aggregation of population growth from LGA to SA2 levels. Moving forward with demographic trends, a population increase just below the median of statistical areas analysed by AreaSearch is expected for the suburb of Semaphore, with an expected increase of 241 persons to reach 3,083 by 2041 based on aggregated SA2-level projections, reflecting an overall increase of 10.1% over the 17-year period.

AreaSearch analysis of residential development drivers sees Semaphore recording a relatively average level of approval activity when compared to local markets analysed countrywide

Semaphore has received approximately 6 dwelling approvals annually over the past five financial years ending FY25. This totals an estimated 34 homes. In FY26, 15 approvals have been recorded to date. On average, around 4.6 people moved to Semaphore for each dwelling built between FY21 and FY25.

The supply of new dwellings is significantly lagging demand, which can lead to heightened buyer competition and pricing pressures. New homes are being constructed at an average expected cost of $419,000, indicating a focus on the premium segment with upmarket properties. In FY26, Semaphore has registered $894,000 in commercial approvals, suggesting a predominantly residential focus. Compared to Greater Adelaide, Semaphore shows substantially reduced construction activity, with 71.0% fewer approvals per person. This limited new supply generally supports stronger demand and values for established dwellings. Recent construction comprises 38.0% detached dwellings and 62.0% townhouses or apartments, reflecting a shift towards higher-density living to create more affordable entry points and suit downsizers, investors, and first-home buyers. This marks a considerable change from the current housing mix, which is currently 65.0% houses.

Semaphore has approximately 358 people per dwelling approval, indicating an established area. Population forecasts suggest Semaphore will gain 287 residents by 2041. 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 27thth percentile nationally

No infrastructure changes or major projects have been identified by AreaSearch that could impact the area. Key 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.

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The employment environment in Semaphore shows above-average strength when compared nationally

Semaphore's workforce comprises well-educated individuals with notable representation in essential services sectors. The unemployment rate stood at 3.5% as of September 2025, lower than Greater Adelaide's 3.9%. Employment growth over the past year was estimated at 4.2%, based on AreaSearch aggregation of statistical area data.

As of that date, 1,705 residents were in work, with a workforce participation rate of 71.2%, slightly higher than Greater Adelaide's 66.4%. A moderate 14.4% of residents worked from home, potentially influenced by Covid-19 lockdowns. Dominant employment sectors include health care & social assistance, education & training, and public administration & safety, with the latter showing a notable concentration at 1.3 times the regional average. However, construction has limited presence with 6.7% employment compared to 8.7% regionally.

The area appears to offer limited local employment opportunities, as indicated by the count of Census working population versus resident population. Over the 12-month period ending in September 2025, employment increased by 4.2% alongside labour force growth of 3.9%, causing a 0.3 percentage point drop in unemployment rate. In contrast, Greater Adelaide experienced employment growth of 3.0% and labour force growth of 2.9%, with a 0.1 percentage point drop in unemployment rate. National employment forecasts from Jobs and Skills Australia, published in May-25, project national employment to expand by 6.6% 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% over five years and 13.8% over ten years, though this is a simple weighting extrapolation for illustrative purposes and does not account for localised population projections.

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

According to AreaSearch's aggregation of latest postcode level ATO data released for financial year ended June 2023, Semaphore suburb had median income among taxpayers at $56,795 and average income at $67,101. These figures align with national averages and compare to Greater Adelaide levels of $54,808 (median) and $66,852 (average). Based on Wage Price Index growth of 8.8% since financial year ended June 2023, estimated incomes as of September 2025 would be approximately $61,793 (median) and $73,006 (average). From the 2021 Census, Semaphore's household, family, and personal incomes cluster around the 54th percentile nationally. Income distribution shows that 30.9% of locals (878 people) fall into the $1,500 - $2,999 category, consistent with surrounding region at 31.8%. After housing expenses, 86.5% of income remains for other expenses. 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 structure, as per the latest Census, consisted of 65.4% houses and 34.5% other dwellings (semi-detached, apartments, 'other' dwellings). In contrast, Adelaide metro had 75.2% houses and 24.9% other dwellings. Semaphore's home ownership rate was 35.9%, with mortgaged dwellings at 33.6% and rented ones at 30.5%. The median monthly mortgage repayment in Semaphore was $1,733, higher than Adelaide metro's average of $1,562. Median weekly rent in Semaphore was $320, the same as 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 account for the remaining 35.0%, with lone person households at 31.8% and group households comprising 3.4%. The median household size is 2.2 people, which is 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 is notably higher than broader averages. Among residents aged 15 and above, 33.2% have university qualifications, compared to 22.6% in the SA3 area and 25.7% in South Australia overall. This high level of educational attainment positions Semaphore favourably for knowledge-based opportunities. Bachelor degrees are most prevalent at 20.2%, followed by postgraduate qualifications (8.9%) and graduate diplomas (4.1%).

Vocational credentials are also common, with 34.5% of residents aged 15 and above holding such qualifications – advanced diplomas account for 11.8% and certificates for 22.7%. A significant proportion of Semaphore's population is actively engaged in formal education, with 24.3% pursuing it. This includes 7.7% in primary education, 6.5% in tertiary education, and 5.6% pursuing secondary education.

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

Semaphore has 14 operational public transport stops, all of which are bus services. These stops are served by 11 different routes that together facilitate 247 weekly passenger trips. The area's transport accessibility is rated as excellent, with residents typically residing 167 meters from the nearest stop. Predominantly residential, Semaphore sees most residents commuting outward. Cars remain the primary mode of transport at 87%, with cycling at 2%. Vehicle ownership averages 1.2 per dwelling, below the regional average.

According to the 2021 Census, 14.4% of residents work from home, which may be influenced by COVID-19 conditions. The service frequency across all routes averages 35 trips per day, 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 of mortality rates and chronic condition prevalence.

Common health conditions are somewhat typical but higher than the national average among older cohorts. Private health cover is at approximately 54% of the total population, slightly above the average SA2 area level (~1,521 people). Mental health issues and arthritis were found to be the most common medical conditions in the area, affecting 10.0% and 9.0% of residents respectively. However, 62.5% of residents declared themselves 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. Semaphore has a higher proportion of residents aged 65 and over at 22.4% (636 people) compared to Greater Adelaide's 19.3%. Health outcomes among seniors present some challenges, ranking lower nationally than 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 cultural diversity aligns with its broader region, as indicated by 77.0% of residents born in Australia, 88.9% being citizens, and 91.5% speaking English only at home. Christianity is the predominant religion, practised by 39.7%. However, Islam is overrepresented at 1.2%, compared to the Greater Adelaide average of 3.0%.

The top three ancestral groups are English (30.9%), Australian (21.9%), and Irish (9.1%). Notably, Polish (1.3% vs regional 1.0%), German (6.0% vs 5.1%), and Dutch (2.0% vs 1.2%) populations diverge from the regional averages.

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 significantly above the national norm of 38. The 55-64 age group constitutes 20.9% of Semaphore's population, compared to Greater Adelaide, while the 25-34 cohort makes up only 9.0%. This concentration in the 55-64 age group is higher than the national figure of 11.2%. Post-2021 Census data shows that the 75-84 age group has grown from 5.0% to 6.7% of Semaphore's population, while the 45-54 cohort has declined from 17.4% to 14.9%. By 2041, Semaphore is expected to see significant shifts in its age composition. The 75-84 group is projected to grow by 54%, reaching 293 people from 190. The aging population trend is evident, with those aged 65 and above comprising 70% of the projected growth. Conversely, population declines are projected for the 35-44 and 55-64 age cohorts.