Largs Bay - Semaphore

Largs Bay - Semaphore is positioned among the lower quartile of areas assessed nationally for population growth based on AreaSearch's assessment of recent, and medium term trends

As of Nov 2025, Largs Bay - Semaphore's population is around 15,686. This reflects an increase of 879 people since the 2021 Census, which reported a population of 14,807. The change was inferred from ABS estimated resident population of 15,627 as of June 2024 and additional validated new addresses since the Census date. This equates to a density ratio of 2,334 persons per square kilometer, placing it in the upper quartile nationally. Since the census, Largs Bay - Semaphore's growth rate was 5.9%, within 1.2 percentage points of South Australia's state average of 7.1%. Population growth was primarily driven by overseas migration contributing approximately 69.3% during recent periods.

AreaSearch adopts ABS/Geoscience Australia projections for each SA2 area, released in 2024 with a base year of 2022. For areas not covered and years post-2032, the SA State Government's Regional/LGA projections by age category are adopted, based on 2021 data and adjusted using weighted aggregation from LGA to SA2 levels. Based on latest annual ERP population numbers, Largs Bay - Semaphore is expected to grow by 1,185 persons to 2041, reflecting a total increase of 7.2% over the 17 years.

Recent residential development output has been above average within Largs Bay - Semaphore when compared nationally

Largs Bay - Semaphore has averaged approximately 89 new dwelling approvals annually over the past five financial years, totalling 446 homes. As of FY-26118 approvals have been recorded. On average, 1.6 new residents per year per dwelling constructed were noted between FY-21 and FY-25, suggesting a balanced supply and demand scenario with stable market conditions. New properties are being constructed at an average expected cost of $419,000.

In FY-26, there have been $14.9 million in commercial approvals, indicating steady commercial investment activity. Compared to Greater Adelaide, Largs Bay - Semaphore records around 69% of the building activity per person and ranks among the 65th percentile nationally in terms of assessed areas for new building activity. The current mix shows 34.0% detached dwellings and 66.0% townhouses or apartments, a shift from the previous housing mix of 70.0% houses. This change reflects reduced development site availability and evolving lifestyle demands and affordability requirements. There are approximately 283 people per dwelling approval in the area, indicating a low density market.

According to AreaSearch's latest quarterly estimate, Largs Bay - Semaphore is expected to grow by 1,126 residents by 2041. At current development rates, new housing supply should comfortably meet demand, providing favourable conditions for buyers and potentially supporting growth beyond current population projections.

Largs Bay - Semaphore has limited levels of nearby infrastructure activity, ranking in the 11thth percentile nationally

Changes in local infrastructure significantly affect an area's performance. AreaSearch has identified 13 projects that could impact this region. Notable ones are Fletcher's Slip, Dock One, Centre Street, Largs Bay, and Our Port. The following details those expected to have the greatest influence.

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

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AreaSearch analysis indicates Largs Bay - Semaphore maintains employment conditions that align with national benchmarks

Largs Bay - Semaphore has a skilled workforce with essential services sectors well represented. The unemployment rate was 4.1% in the past year, with an estimated employment growth of 2.7%.

As of June 2025, 8,978 residents were employed, while the unemployment rate was 0.1% higher than Greater Adelaide's rate of 4.0%. Workforce participation was 64.7%, compared to Greater Adelaide's 61.7%. Key industries of employment among residents are health care & social assistance, public administration & safety, and education & training. The area shows strong specialization in public administration & safety with an employment share of 1.3 times the regional level.

Health care & social assistance has limited presence at 16.4% compared to the regional level of 17.7%. Employment opportunities locally appear limited based on Census data comparison of working population vs resident population. In the 12-month period ending June 2025, employment increased by 2.7%, while labour force increased by 3.3%, causing unemployment rate to rise by 0.6 percentage points. Greater Adelaide recorded employment growth of 2.1% and labour force growth of 2.1%, with a marginal increase in unemployment. State-level data from Nov-25 shows SA employment grew by 1.19% year-on-year, adding 10,710 jobs, with the state unemployment rate at 4.0%. This compares favourably to the national unemployment rate of 4.3%, with SA's employment growth outpacing the national average of 0.14%. Jobs and Skills Australia's national employment forecasts from May-25 suggest employment should increase by 6.4% over five years and 13.4% over ten years in Largs Bay - Semaphore, based on a simple weighting extrapolation of industry-specific projections against the local employment mix.

The economic profile demonstrates above-average performance, with income metrics exceeding national benchmarks based on AreaSearch comparative assessment

AreaSearch released postcode level ATO data for financial year 2022. Largs Bay - Semaphore SA2's median income among taxpayers was $56,862, with an average of $67,180. This was above Greater Adelaide's median of $52,592 and average of $64,886. By September 2025, estimates suggest the median would be approximately $64,157 and the average $75,799, accounting for a 12.83% Wage Price Index growth since financial year 2022. Census data shows personal income ranks at the 60th percentile ($858 weekly), while household income is at the 40th percentile. Income analysis reveals that 32.4% of locals (5,082 people) fall into the $1,500 - 2,999 category. Housing affordability pressures are severe, with only 84.6% of income remaining, ranking at the 41st percentile. The area's SEIFA income ranking places it in the 5th decile.

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

In Largs Bay - Semaphore, as per the latest Census evaluation, 69.8% of dwellings were houses, with 30.2% being other types such as semi-detached homes, apartments, and 'other' dwellings. This is similar to Adelaide metro's figures of 69.1% houses and 30.9% other dwellings. Home ownership in Largs Bay - Semaphore stood at 30.5%, with mortgaged properties at 39.7% and rented ones at 29.8%. The median monthly mortgage repayment was $1,625, higher than Adelaide metro's $1,517. The median weekly rent was $320, compared to Adelaide metro's $295. Nationally, Largs Bay - Semaphore's mortgage repayments were lower at $1,625 versus Australia's average of $1,863, and rents were substantially lower at $320 compared to the national figure of $375.

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

Family households constitute 62.4% of all households, including 23.1% couples with children, 26.6% couples without children, and 11.5% single parent families. Non-family households comprise the remaining 37.6%, with lone person households at 34.6% and group households at 3.0%. The median household size is 2.2 people, which is smaller than the Greater Adelaide average of 2.3.

Largs Bay - Semaphore shows below-average educational performance compared to national benchmarks, though pockets of achievement exist

University qualification levels in Largs Bay - Semaphore stand at 26.3%, slightly below the Australian average of 30.4%. Bachelor degrees are most common at 17.2%, followed by postgraduate qualifications (5.8%) and graduate diplomas (3.3%). Vocational credentials are held by 35.8% of residents aged 15+, with advanced diplomas at 11.1% and certificates at 24.7%.

A total of 23.8% of the population is engaged in formal education, including 7.9% in primary, 5.8% in secondary, and 5.2% in tertiary education.

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

Transport analysis shows 71 active transport stops operating in Largs Bay - Semaphore, consisting of a mix of train and bus services. These stops are served by 19 individual routes, collectively offering 944 weekly passenger trips. Transport accessibility is rated excellent, with residents typically located 171 meters from the nearest stop.

Service frequency averages 134 trips per day across all routes, equating to approximately 13 weekly trips per stop.

Health performance in Largs Bay - Semaphore is lower than average with prevalence of common health conditions notable across both younger and older age cohorts

Largs Bay-Semaphore faces significant health challenges, with notable prevalence of common health conditions across both younger and older age cohorts. The rate of private health cover is approximately 53% of the total population (~8,376 people), compared to 49.8% across Greater Adelaide.

Mental health issues and arthritis are the most common medical conditions in the area, impacting 10.0% and 9.3% of residents respectively. 64.0% of residents declare themselves completely clear of medical ailments, compared to 66.1% across Greater Adelaide. The area has 20.4% of residents aged 65 and over (3,195 people), which is higher than the 19.2% in Greater Adelaide. Health outcomes among seniors present some challenges, broadly in line with the general population's health profile.

Largs Bay - Semaphore ranks below the Australian average when compared to other local markets across a number of language and cultural background related metrics

Largs Bay-Semaphore had a low cultural diversity, with 80.9% born in Australia, 91.4% being citizens, and 91.4% speaking English only at home. Christianity was the dominant religion, comprising 40.5%. Islam was underrepresented at 0.6%, compared to Greater Adelaide's 3.3%.

The top ancestral groups were English (31.3%), Australian (24.0%), and Irish (8.7%). Polish (1.1%) and German (5.4%) were overrepresented, while Welsh (0.7%) was slightly more prevalent than regionally.

Largs Bay - Semaphore hosts a notably older demographic compared to the national average

Largs Bay - Semaphore's median age is 45 years, which is higher than Greater Adelaide's average of 39 years and exceeds the national average of 38 years. The 55-64 age group comprises 17.2% of its population, compared to Greater Adelaide's figure, while the 15-24 cohort makes up only 9.6%. This concentration in the 55-64 age group is higher than the national average of 11.2%. Post-2021 Census data shows that the 75-84 age group grew from 4.7% to 6.0%, while the 45-54 cohort declined from 14.9% to 12.8%. By 2041, demographic modeling suggests significant changes in Largs Bay - Semaphore's age profile. The 75-84 cohort is projected to grow by 57%, adding 534 residents to reach 1,477. Residents aged 65 and above will drive 82% of population growth, indicating demographic aging trends. Meanwhile, population declines are projected for the 25-34 and 15-24 age cohorts.