Williamstown (SA)

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Evaluating demographics from ABS updates for the region alongside fresh addresses validated by Districts since the Census, the suburb of Williamstown (SA) has an estimated population of approximately 3,129 in May 2026. This indicates a growth of 148 people (5.0%) from the 2,981 residents reported in the 2021 Census. This adjustment is drawn from an estimated resident population of 3,124 calculated by Districts using the ABS ERP release from June 2025 plus 14 validated new addresses added post-Census. With these figures, the density sits at 43 persons per square kilometer, offering residents substantial personal space. Over the last ten years, the suburb of Williamstown (SA) has shown steady expansion with a 0.9% compound annual growth rate, exceeding the SA4 average. Growth was mostly fueled by interstate migration, which accounted for roughly 40.0% of the total population increase, with overseas migration and natural growth also contributing positively.

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Williamstown features a well-rounded labor force that includes both white collar and blue collar occupations, with key service industries adequately represented, an unemployment rate of just 2.0%, and an estimated employment growth of 3.6% over the past year, according to Districts aggregation of statistical area data. As of March 2026, 1,728 residents are employed, and the unemployment rate stands at 3.4% below the Regional SA rate of 5.5%, while workforce participation exceeds standard levels at 68.9% compared to Regional SA's 58.4%. Census data indicates that a low 10.0% of residents work from home, though the influence of Covid-19 lockdown measures should be taken into account.

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Taxpayer data from the ATO for the 2023 financial year indicates that the median income in the locality was $54,998, with the average income recorded at $63,575. These figures are below the national averages and compare to a median of $48,920 and an average of $58,933 across Regional SA. Adjusting for a 10.17% increase in the Wage Price Index since the 2023 financial year, estimated incomes as of March 2026 would be approximately $60,591 for the median and $70,041 for the average. Census data places household, family, and individual incomes around the 51st percentile nationwide. Income distribution shows that the $1,500 - 2,999 weekly bracket accounts for 36.0% of the population (representing 1,126 residents), which aligns with the regional trend of 27.5% in this bracket. Residents retain of their earnings after meeting housing expenses, showing good disposable income, and the area ranks in the th decile of the SEIFA index.

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According to the latest Census, the housing stock consisted of 99.1% separate houses and 0.9% other property types like townhouses and units, whereas Regional SA recorded 88.5% houses and 11.5% other dwellings. The rate of outright home ownership stood at 33.4%, which is lower than the Regional SA average, with the remaining properties occupied by residents with a mortgage (55.4%) or renting (11.3%). The median monthly mortgage payment of $1,500 was notably higher than the Regional SA median of $1,153, while the median weekly rent was $300, compared to $220 across Regional SA. On a national level, mortgage costs are lower than the Australian average of $1,863, and rent levels are also below the national benchmark of $375.

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Families make up the majority of households at 79.5%, consisting of 38.1% couples with children, 31.8% couples without children, and 9.0% single parents. Non-family living arrangements account for the remaining 20.5%, with single-person households representing 19.8% and group homes making up 0.9% of the total. The median household size of 2.7 individuals is larger than the Regional SA average of 2.3.

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Educational statistics indicate lower levels of tertiary attainment, with university completion rates at 17.5% compared to the national average of 30.4%. Among those with university degrees, bachelor degrees account for 12.8%, followed by graduate diplomas at 2.6% and postgraduate degrees at 2.1%. Practical and technical vocations are highly represented, with 43.1% of residents aged 15 and over holding vocational qualifications, split between advanced diplomas at 10.7% and certificates at 32.4%.

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Local health metrics show favorable outcomes, with analysis of mortality rates and chronic conditions aligning closely with national averages across different age demographics. The percentage of the population holding private health insurance is slightly above the average SA2 area at approximately 52%, representing about 1,631 residents, compared to 48.9% in Regional SA.

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Cultural diversity metrics are low, with 84.8% of the population born within Australia, 93.6% holding citizenship, and 98.1% speaking only English at home. Christianity is the primary religious affiliation, representing 37.9% of residents. In contrast, Jewish affiliation represents a zero value, matching the zero value recorded across Regional SA.

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The median age is 42, making the population younger than the Regional SA average of 47 but older than the national median of 38. Children aged 5 to 14 represent 14.3% of the community, which is a strong share compared to Regional SA, while the 65 to 74 age bracket is less common at 9.9%. Post-2021 Census estimates indicate the 75 to 84 cohort has expanded from 4.0% to 5.7%, and the 15 to 24 group grew from 11.4% to 13.1%. Meanwhile, the 45 to 54 cohort fell from 15.1% to 13.6%. By 2041, demographic adjustments are expected, led by a increase in the to population, which is projected to rise by people to reach from . The to group is projected to see a smaller growth, adding people.

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Williamstown currently has an estimated 140 children under 5 years old, comprising approximately 82 children aged 0-2 and 55 children aged 3-4. This cohort declined by an estimated 8% since the previous census. though population forecasts indicate future growth, with an anticipated increase of 20% by 2041 (to approximately 168 children). Meanwhile the 5-12 cohort currently amounts to 341. Birth rates in the area have averaged 8.0 per 1,000 residents over the latest two-year period, a low rate (among the bottom 30% of areas assessed nationally). This rate has slowed down slightly in recent years however.