St Marys (NSW), NSW
By Lauren McCaleb · Reviewed by Dylan Duncan ·
Among Australia's less advantaged suburbs
St Marys (NSW) is more socio-economically advantaged than about 13% of the 14,462 Australian suburbs we score, based on the ABS SEIFA index (raw score 906, where about 1000 is the national average).
A socio-economic measure from ABS Census data — not a measure of how good a suburb is to live in or visit. How we calculate this.
St Marys (NSW) at a glance
- Population (2021)
- 13,256
- Median age
- 34
- Median weekly household income
- $1,437
- SEIFA score
- 906
- Coordinates
- -33.7591, 150.7708
St Marys (NSW) demographics (2021 Census)
The figures below profile St Marys (NSW) using the Australian Bureau of Statistics 2021 Census; every percentage is a share of a clearly stated Census count, so each one traces back to the source. At a glance, the largest age group is young adults (25–44) at 32%, 53% of homes are rented, and 37% of residents were born overseas.
Age profile
| Age group | People | Share |
|---|---|---|
| Children (0–14) | 2,827 | 21% |
| Youth (15–24) | 1,566 | 12% |
| Young adults (25–44) | 4,224 | 32% |
| Mid-life (45–64) | 2,979 | 22% |
| Seniors (65+) | 1,677 | 13% |
Share of the 13,273 people counted by age.
Housing and households
| Tenure | Dwellings | Share |
|---|---|---|
| Owned outright | 854 | 18% |
| Owned with a mortgage | 1,268 | 27% |
| Rented | 2,510 | 53% |
| Dwelling type | Dwellings | Share |
|---|---|---|
| Houses | 2,442 | 51% |
| Townhouses & semis | 1,431 | 30% |
| Flats & apartments | 885 | 19% |
Tenure and dwelling shares are of the roughly 4,770 occupied private dwellings in St Marys (NSW).
- Median weekly rent
- $365
- Median monthly mortgage
- $1,847
- Average household size
- 2.5 people
- Median weekly family income
- $1,747
- Median weekly personal income
- $754
Community and culture
- Born overseas
- 4,409 (37%)
- Speaks a language other than English at home
- 4,068 (34%)
- Aboriginal and/or Torres Strait Islander
- 605 (5%)
Work and education
- Completed Year 12
- 4,850 (48%)
- Labour-force participation
- 54.2%
- Unemployment rate
- 7.3%
- Employed full-time
- 3,029
- Employed part-time
- 1,469
Source: ABS Census of Population and Housing, 2021 (General Community Profile, by Suburb and Locality). © Australian Bureau of Statistics, released under CC BY 4.0. How we group bands and derive each share is set out on our methodology page.
Weather and climate in St Marys (NSW)
Based on 2014–2023 records, the warmest month in St Marys (NSW) is January (average daytime high around 29.5°C) and the coolest is July (around 17.1°C). The area receives roughly 813 mm of rain across the year.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 29.5°C | 18.5°C | 86 mm |
| Feb | 28.1°C | 17.8°C | 92 mm |
| Mar | 26°C | 16.5°C | 136 mm |
| Apr | 23.3°C | 12.8°C | 69 mm |
| May | 20°C | 8.8°C | 33 mm |
| Jun | 17.1°C | 6.9°C | 47 mm |
| Jul | 17.1°C | 5.4°C | 50 mm |
| Aug | 18.3°C | 6°C | 47 mm |
| Sep | 21.6°C | 8.6°C | 38 mm |
| Oct | 24.7°C | 11.9°C | 70 mm |
| Nov | 26.4°C | 14.1°C | 67 mm |
| Dec | 28.6°C | 16.7°C | 78 mm |
Climate normals, 2014–2023 (Open-Meteo, ERA5 reanalysis).
Common questions about St Marys (NSW)
Where is St Marys (NSW)?
St Marys (NSW) is a suburb of New South Wales, Australia.
What is the population of St Marys (NSW)?
At the 2021 Census, St Marys (NSW) had a population of about 13,256.
Is St Marys (NSW) an advantaged area?
St Marys (NSW) has an ABS SEIFA score of 906, where about 1000 is the national average — higher scores indicate greater relative socio-economic advantage. That gives it a Suburb Score of 13 out of 100 — more socio-economically advantaged than about 13% of Australian suburbs.
What is the weather like in St Marys (NSW)?
St Marys (NSW) has average daytime highs of about 23.4°C and overnight lows of about 12°C, with roughly 813 mm of rain across the year (based on 2014–2023 climate normals).
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