Williamstown (SA)

Population growth drivers in Williamstown are slightly above average based on AreaSearch's ranking of recent, and medium term trends

As of February 2026, the estimated population of Williamstown (SA) is around 3,290. This figure represents an increase of 309 people since the 2021 Census, which reported a population of 2,981. The latest estimate from AreaSearch, based on examination of ERP data released by the ABS in June 2024 and additional validated new addresses, is 3,210 residents. This results in a population density ratio of 45 persons per square kilometer. Between 2021 and February 2026, Williamstown's population grew by 10.4%, exceeding the SA4 region's growth rate of 7.4%. Interstate migration contributed approximately 40% to this growth during recent periods.

AreaSearch uses ABS/Geoscience Australia projections for each SA2 area released in 2024 with a base year of 2022, and SA State Government projections by age category from 2023 based on 2021 data for areas not covered by this data or years post-2032. Future projections indicate an above median population growth for Australian non-metropolitan areas, with Williamstown expected to grow by 549 persons to reach a total of 3,839 by 2041, reflecting a 12.8% increase over the 17-year period.

Recent residential development output has been above average within Williamstown when compared nationally

Williamstown has received approximately 11 dwelling approvals annually. Between financial years FY21-FY25, around 58 homes were approved, with another 12 approved in FY26 so far. Each home built over these five years brought an average of 3.3 new residents.

This supply lagged demand, leading to heightened buyer competition and pricing pressures. The average construction cost value for new homes was $381,000, indicating a focus on premium properties. In FY26, commercial development approvals totalled $496,000.

Compared to the Rest of SA, Williamstown had approximately 62% of the construction activity per person as of recent years, placing it in the 71st percentile nationally. All developments since have been detached dwellings, maintaining the area's low-density nature and attracting space-seeking buyers. The population density is around 180 people per approval. By 2041, Williamstown is projected to add 420 residents, with building activity keeping pace with growth projections despite potential heightened competition as the population grows.

Williamstown has emerging levels of nearby infrastructure activity, ranking in the 22ndth percentile nationally

No changes can significantly affect a region's performance like modifications to nearby infrastructure, substantial projects, or planning initiatives. AreaSearch has identified zero projects that are predicted to impact this area. Notable projects include Concordia Residential Development, Barossa Growth and Infrastructure Investment Strategy, Northern Adelaide Transport Study, and SA Public Housing Maintenance and Services Contracts, with the following list outlining those most likely to be relevant.

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Employment conditions in Williamstown demonstrate exceptional strength compared to most Australian markets

Williamstown's workforce is balanced across white and blue-collar jobs. Key sectors include health care & social assistance, manufacturing, and construction. As of September 2025, unemployment stands at 2.4%, with an estimated employment growth of 1.5% over the past year.

Residents have a higher participation rate (66.8%) compared to Rest of SA's 58.5%. Only 10% work from home. The area specializes in construction, with an employment share 1.6 times the regional level, but has lower representation in agriculture, forestry & fishing (4.7% vs regional average of 14.5%). Employment opportunities appear limited locally based on resident population versus working population count.

Over the year to September 2025, employment increased by 1.5%, labour force by 2.1%, leading to a rise in unemployment by 0.6 percentage points. National employment forecasts from Jobs and Skills Australia project growth of 6.6% over five years and 13.7% over ten years. Applying these projections to Williamstown's employment mix suggests local employment should increase by 5.7% over five years and 12.4% over ten years, though this is a simple 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 the latest postcode level ATO data released on 30 June 2023, Williamstown had a median income among taxpayers of $54,998. The average income stood at $63,575. This is below the national average. In comparison, Rest of SA had levels of $48,920 and $58,933 respectively. Based on Wage Price Index growth of 8.8% since financial year 2023, current estimates would be approximately $59,838 (median) and $69,170 (average) as of September 2025. From the 2021 Census, household, family and personal incomes in Williamstown cluster around the 51st percentile nationally. Looking at income distribution, 36.0% of locals (1,184 people) fall into the $1,500 - 2,999 category. After housing costs, residents retain 87.3% of their income. The area's SEIFA income ranking places it in the 5th decile.

Williamstown is characterized by a predominantly suburban housing profile, with ownership patterns similar to the broader region

Dwelling structure in Williamstown, as evaluated at the latest Census, comprised 99.1% houses and 0.9% other dwellings. In comparison, Non-Metro SA had 88.5% houses and 11.5% other dwellings. Home ownership in Williamstown was 33.4%, with mortgaged dwellings at 55.4% and rented ones at 11.3%. The median monthly mortgage repayment was $1,500, higher than Non-Metro SA's average of $1,153. Median weekly rent in Williamstown was $300, compared to Non-Metro SA's $220. Nationally, Williamstown's mortgage repayments were lower at $1,500 versus the Australian average of $1,863, and rents were also lower at $300 compared to the national figure of $375.

Williamstown features high concentrations of family households, with a higher-than-average median household size

Family households constitute 79.5% of all households, including 38.1% couples with children, 31.8% couples without children, and 9.0% single parent families. Non-family households account for the remaining 20.5%, with lone person households at 19.8% and group households comprising 0.9%. The median household size is 2.7 people, larger than the Rest of SA average of 2.3.

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

The area's university qualification rate is 17.5%, significantly lower than the Australian average of 30.4%. This presents both a challenge and an opportunity for targeted educational initiatives. Bachelor degrees are most common at 12.8%, followed by graduate diplomas (2.6%) and postgraduate qualifications (2.1%). Vocational credentials are prevalent, with 43.1% of residents aged 15+ holding them - advanced diplomas at 10.7% and certificates at 32.4%.

Educational participation is high, with 27.3% of residents currently enrolled in formal education. This includes 12.0% in primary education, 7.8% in secondary education, and 3.0% pursuing tertiary education.

No public transport data available for this catchment area.

Williamstown's residents are healthier than average in comparison to broader Australia with a fairly standard level of common health conditions seen across both young and old age cohorts

Williamstown's health data shows positive outcomes relative to national benchmarks. Mortality rates and health conditions are largely standard for both young and elderly residents.

Private health cover is at 52%, slightly higher than the SA2 average of 48.9%. The most prevalent medical conditions are asthma (affecting 8.9% of residents) and arthritis (8.8%), with 66.3% reporting no medical ailments, compared to 62.5% in Rest of SA. Health outcomes among working-age individuals are typical. The area has 19.1% of residents aged 65 and over (628 people), lower than the 27.1% in Rest of SA. Senior health outcomes are above average, aligning with national rankings for the general population.

Williamstown is considerably less culturally diverse than average when assessed alongside AreaSearch's national rankings for language and cultural background related metrics

Williamstown, established in terms of cultural diversity, had a population where 84.8% were born in Australia, 93.6% were citizens, and 98.1% spoke English only at home. Christianity was the predominant religion, comprising 37.9% of Williamstown's population. Notably, Judaism was not represented (0.0%), unlike the Rest of SA where it comprised 0.0%.

The top three ancestry groups in Williamstown were English (35.3%), Australian (32.1%), and German (9.1%). Some ethnic groups showed notable differences: Dutch were overrepresented at 1.8% (versus 1.3% regionally), Maltese at 0.4% (versus 0.2%), and Macedonian at 0.1% (versus 0%).

Williamstown's median age exceeds the national pattern

Williamstown has a median age of 42, which is younger than the Rest of SA figure of 47 and higher than the national norm of 38. The 5-14 age group makes up 14.1% of Williamstown's population, compared to the Rest of SA, while the 75-84 cohort comprises 5.3%. According to data from the 2021 Census, the 75-84 age group has grown from 4.0% to 5.3%, and the 45-54 cohort has declined from 15.1% to 13.3%. By 2041, Williamstown's age composition is expected to shift notably. The 65-74 group is projected to grow by 20%, reaching 455 people from 378. Those aged 65 and above are expected to comprise 51% of the population growth, while the 5-14 cohort shows minimal growth of just 2%.