Population
+4.5% since 2016.
Williamstown, SA
Williamstown had a population of 2,981 at the 2021 Census (+4.5% since 2016). Median age 42.0. Median weekly household income $1,782. Source: ABS Census 2021, via Censible. Census 2026 data arrives June 2027.
Williamstown at a glance
What the 2021 Census says, compared with South Australia.
Between the 2016 and 2021 censuses, Williamstown's population grew by 4.5% to 2,981, slower than South Australia as a whole (+6.3%). Its median age of 42.0 is close to the SA average (41.0). Children under 10 make up 12.4% of residents, and people aged 70 and over 11.3%.
11.3% of households rent, a smaller share than the SA average of 27.9%. 32.8% own their home outright. Almost every home is a house; flats and apartments are 0.0% of homes. The 2021 Census counted 1,064 households.
The median household earns $1,782 a week, above the SA average of $1,455. Renters pay a median $300 a week, and households with a mortgage repay $1,500 a month.
15.2% of residents were born overseas, fewer than the SA average of 25.2%. 1.9% use a language other than English at home. 61.9% report no religion, higher than the SA average (48.9%).
Key figures
2021 Census, Williamstown beside SA and Australia.
| Measure | Williamstown | SA | Australia |
|---|---|---|---|
| Population | 2,981 | 1,781,516 | 25,422,788 |
| Growth since 2016 | +4.5% | +6.3% | +8.6% |
| Median age | 42.0 | 41.0 | 38.0 |
| Households | 1,064 | 691,313 | 9,275,217 |
| Flats and apartments | 0.0% | 6.8% | 14.3% |
| Renting | 11.3% | 27.9% | 31.1% |
| Owned outright | 32.8% | 33.3% | 31.4% |
| Median household income a week | $1,782 | $1,455 | $1,746 |
| Median rent a week | $300 | $300 | $375 |
| Median mortgage repayment a month | $1,500 | $1,500 | $1,863 |
| Born overseas | 15.2% | 25.2% | 29.3% |
| Other language at home | 1.9% | 18.7% | 23.6% |
| No religion | 61.9% | 48.9% | 41.9% |
Source: ABS Census 2021, via Censible. How the figures are built
Population and age
Each census since 2011, and the age profile in 2021.
Age
Median age 42.0, against 41.0 for South Australia.
Source: ABS Census 2021, via Censible. How the figures are built
Cultural background
The largest groups in Williamstown at the 2021 Census.
Ancestry
Languages at home
Country of birth
Source: ABS Census 2021, via Censible. How the figures are built
Around Williamstown
The places it belongs to, sits beside and contains.
Part of
Nearby
Explore Williamstown in Censible
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