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Williamstown Postcode
South Australia
Income, rent and SEIFA figures are from the ABS 2021 Census and are reported in 2021 dollars, not adjusted for subsequent inflation.
How Williamstown Compares
Williamstown vs the SA average and the national average (2021 Census, population-weighted).
| Metric | Williamstown | SA avg | AU avg | Greater Adelaide |
|---|---|---|---|---|
| Household income/wk | $1,782 +SA | $1,545 | $1,836 | $1,620 |
| Rent/wk | $300 ≈SA | $308 | $390 | $329 |
| Mortgage/month | $1,500 ≈SA | $1,558 | $1,958 | $1,666 |
| Median age | 42 | 45.0 | 45.0 | 42.0 |
| SEIFA decile | 6/10 ≈SA | 5.0/10 | 6.0/10 | 7.0/10 |
| Unemployment | 3.3% -SA | 6.0% | 5.0% | 6.0% |
Green pill = at least 10% above the SA average; red = at least 10% below; grey = within 10%. For unemployment, colour polarity is inverted: lower is better.
Williamstown is a locality 39 km from Adelaide in South Australia, classified as inner regional by the ABS. The postcode is 5351. It falls within the Barossa - Yorke - Mid North region. The local government area is Barossa.
According to the 2021 Census, Williamstown has a population of 2,981 with a median age of 42. The median weekly household income is $1,782, above the SA average. The unemployment rate is 3.3%, lower than the SA average. The Indigenous population is 38 (1.3% of residents).
Housing in Williamstown includes a median weekly rent of $300, median monthly mortgage repayment of $1,500, with 1,064 total dwellings. Owner-occupied dwellings (owned or mortgaged) make up 88.6% of housing.
On the SEIFA Index of Relative Socio-economic Advantage and Disadvantage, Williamstown scores in decile 6 out of 10, which is around the national average.
Williamstown is served by Williamstown Primary School.
Williamstown is part of the Barossa statistical area in South Australia.
Williamstown Details
| Postcode | 5351 |
| State | South Australia (SA) |
| Phone Area Code | 08 |
| Population (2021) | 2,981 |
| Median Age | 42 years |
| Median Household Income (Census 2021) | $1,782/week |
| Median Personal Income (Census 2021) | $813/week |
| Median Weekly Rent (Census 2021) | $300 |
| Median Monthly Mortgage (Census 2021) | $1,500 |
| Average Household Size | 2.7 persons |
| Area | 71.3 km² |
| Population Density | 42/km² |
| Total Dwellings | 1,064 |
| Australian Citizens | 93.6% |
| Indigenous Population | 38 (1.3%) |
| Unemployment Rate | 3.3% |
| SEIFA IRSAD Decile | 6/10 (average) |
| Latitude | -34.6707789 |
| Longitude | 138.8882602 |
| Distance from Adelaide | 39 km |
| Region (SA4) | Barossa - Yorke - Mid North |
| Area (SA3) | Barossa |
| Local Government | Barossa |
| Federal Electorate | Barker |
Age Profile
Show counts
| 0–14 years | 596 (20.0%) |
| 15–24 years | 339 (11.4%) |
| 25–44 years | 664 (22.3%) |
| 45–64 years | 892 (29.9%) |
| 65+ years | 498 (16.7%) |
Housing Tenure
SEIFA Socio-economic Index
Index of Relative Socio-economic Advantage and Disadvantage (IRSAD), decile 6 of 10. Higher deciles indicate more advantage.
Health Conditions (2021 Census)
| Asthma | 300 (10.1%) |
| Arthritis | 295 (9.9%) |
| Diabetes | 137 (4.6%) |
| Heart Disease | 105 (3.5%) |
| Cancer | 89 (3.0%) |
| Lung Condition | 50 (1.7%) |
| Dementia | 23 (0.8%) |
Long-term health conditions self-reported in the 2021 Census. Persons may report more than one condition.
Motor Vehicles per Dwelling
| No vehicle | 14 (1.3%) |
| 1 vehicle | 242 (23.0%) |
| 2 vehicles | 415 (39.4%) |
| 3+ vehicles | 381 (36.2%) |
Schools in Williamstown
Suburbs Near Williamstown
Same Postcode (5351)
More Williamstown Data
Page last reviewed . Data sources: Australian Bureau of Statistics 2021 Census (CC BY 4.0), SEIFA 2021 IRSAD, ACARA school profiles 2025. How this data is sourced.