3,010 ▲ +11.7%
Higher than 84% of suburb / locality areas.
- 2011: 2,695
- 2016: 2,759
- 2021: 3,010
The number of people who usually live in the area, counted on Census night.
St Marys · Suburb / Locality
Demographics & Identity in St Marys
Who lives here — how many people, how old they are, and how communities identify.
A noticeably younger population defines St Marys, where the typical resident is just 35. This is much lower than the typical age across most similar areas, creating a community that is significantly younger than both the state and national averages.
3,010
▲ +11.7%
- 1–1: 689 areas
- 1–2: 0 areas
- 2–3: 119 areas
- 3–5: 108 areas
- 5–7: 243 areas
- 7–11: 241 areas
- 11–16: 514 areas
- 16–24: 579 areas
- 24–36: 898 areas
- 36–53: 1059 areas
- 53–79: 1168 areas
- 79–117: 1203 areas
- 117–174: 1171 areas
- 174–258: 1010 areas
- 258–384: 856 areas
- 384–571: 670 areas
- 571–850: 616 areas
- 850–1,263: 567 areas
- 1,263–1,879: 520 areas
- 1,879–2,794: 590 areas
- 2,794–4,154: 679 areas
- 4,154–6,177: 585 areas
- 6,177–9,186: 528 areas
- 9,186–13,659: 405 areas
- 13,659–20,311: 195 areas
- 20,311–30,202: 96 areas
- 30,202–44,910: 33 areas
- 44,910–66,781: 10 areas
All suburb / locality areas, 2021. The marker is St Marys — higher than 84% of areas.
| St Marys | 3,010 |
|---|---|
| 5042, SA | 11,832 |
| South Australia | 1,781,516 |
| Australia | 25,422,788 |
Population
How many people, and the typical age.
The population has grown to 3,010 people, making St Marys larger than about 84% of similar areas.
35 yrs ▲ +6.1%
Younger than 86% of suburb / locality areas.
- 2011: 33 yrs
- 2016: 34 yrs
- 2021: 35 yrs
Half the population is older than this age, and half younger.
Age profile
How the population splits across age groups.
Young adults aged 25 to 44 make up the largest group at 37.4%. This helps explain why seniors aged 65 and over are much less common here at 13.1%, a figure well below the state average of 20%.
13.1% ▼ -4.7%
Lower than 74% of suburb / locality areas.
- 2011: 13.7%
- 2016: 13.6%
- 2021: 13.1%
Share of the population aged 65 years and over.
16.7% ▼ -4.8%
Lower than 53% of suburb / locality areas.
- 2011: 17.6%
- 2016: 17.9%
- 2021: 16.7%
Share of the population aged under 15 years.
Age structure
View on map →In St Marys, the largest group is Young adults (25–44) at 37%, followed by Older adults (45–64) (21%) and Children (0–14) (17%).
Identity & relationships
First Nations identity and marital status.
Most residents have never married (41.8%) or are married (41.4%). People of Aboriginal and Torres Strait Islander descent make up 1.2% of the population, which is a little below the national figure.
1.2% ▲ +20.6%
Lower than 58% of suburb / locality areas.
- 2011: 1.0%
- 2016: 0.9%
- 2021: 1.2%
Share of people who identify as Aboriginal and/or Torres Strait Islander.
12.1% ▲ +37.2%
Lower than 51% of suburb / locality areas.
- 2011: 8.8%
- 2016: 8.7%
- 2021: 12.1%
Share of people aged 15+ who are in a de facto marriage (registered marriages excluded).
Marital status
View on map →St Marys splits fairly evenly between Never married (42%) and Married (42%), with Divorced at 9%.
Age & sex structure
Sources
- Census of Population and Housing — Australian Bureau of Statistics, 2021 (CC BY 4.0).
More for St Marys
Cite this page
Australian Bureau of Statistics. (2021). Demographics & Identity in St Marys [Census of Population and Housing]. CensusAtlas, used under CC BY 4.0. https://censusatlas.au/region/sal/SAL41373/st-marys/topic/demographics-identity