Population
+9.1% since 2016.
St Marys, SA
St Marys had a population of 3,010 at the 2021 Census (+9.1% since 2016). Median age 35.3. Median weekly household income $1,494. Source: ABS Census 2021, via Censible. Census 2026 data arrives June 2027.
St Marys at a glance
What the 2021 Census says, compared with South Australia.
Between the 2016 and 2021 censuses, St Marys's population grew by 9.1% to 3,010, faster than South Australia as a whole (+6.3%). With a median age of 35.3, it is younger than the SA average (40.9). Children under 10 make up 12.2% of residents, and people aged 70 and over 9.9%.
36.4% of households rent, a larger share than the SA average of 27.9%. 24.8% own their home outright. Flats and apartments are 11.0% of homes (6.8% across South Australia). The 2021 Census counted 1,244 households.
The median household earns $1,494 a week, in line with the SA average of $1,456. Renters pay a median $287 a week, and households with a mortgage repay $1,622 a month.
35.4% of residents were born overseas, more than the SA average of 25.2%. 34.9% use a language other than English at home. 39.6% report no religion, lower than the SA average (48.9%).
Key figures
2021 Census, St Marys beside SA and Australia.
| Measure | St Marys | SA | Australia |
|---|---|---|---|
| Population | 3,010 | 1,781,501 | 25,422,828 |
| Growth since 2016 | +9.1% | +6.3% | +8.6% |
| Median age | 35.3 | 40.9 | 38.2 |
| Households | 1,244 | 691,344 | 9,275,123 |
| Flats and apartments | 11.0% | 6.8% | 14.3% |
| Renting | 36.4% | 27.9% | 31.1% |
| Owned outright | 24.8% | 33.3% | 31.4% |
| Median household income a week | $1,494 | $1,456 | $1,747 |
| Median rent a week | $287 | $300 | $376 |
| Median mortgage repayment a month | $1,622 | $1,505 | $1,866 |
| Born overseas | 35.4% | 25.2% | 29.3% |
| Other language at home | 34.9% | 18.7% | 23.6% |
| No religion | 39.6% | 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 35.3, against 40.9 for South Australia.
Source: ABS Census 2021, via Censible. How the figures are built
Cultural background
The largest groups in St Marys at the 2021 Census.
Ancestry
Languages at home
Country of birth
Source: ABS Census 2021, via Censible. How the figures are built
Around St Marys
The places it belongs to, sits beside and contains.
Part of
Nearby
Explore St Marys in Censible
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