North St Marys, NSW
By Lauren McCaleb · Reviewed by Dylan Duncan ·
Among Australia's less advantaged suburbs
North St Marys is more socio-economically advantaged than about 4% of the 14,462 Australian suburbs we score, based on the ABS SEIFA index (raw score 847, 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.
North St Marys at a glance
- Population (2021)
- 4,123
- Median age
- 35
- Median weekly household income
- $1,255
- SEIFA score
- 847
- Coordinates
- -33.7548, 150.7862
North St Marys demographics (2021 Census)
The figures below profile North St Marys 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 26%, 54% of homes are rented, and 25% of residents were born overseas.
Age profile
| Age group | People | Share |
|---|---|---|
| Children (0–14) | 880 | 21% |
| Youth (15–24) | 575 | 14% |
| Young adults (25–44) | 1,080 | 26% |
| Mid-life (45–64) | 937 | 23% |
| Seniors (65+) | 653 | 16% |
Share of the 4,125 people counted by age.
Housing and households
| Tenure | Dwellings | Share |
|---|---|---|
| Owned outright | 282 | 21% |
| Owned with a mortgage | 290 | 22% |
| Rented | 725 | 54% |
| Dwelling type | Dwellings | Share |
|---|---|---|
| Houses | 1,288 | 96% |
| Townhouses & semis | 23 | 2% |
| Flats & apartments | 12 | 1% |
Tenure and dwelling shares are of the roughly 1,338 occupied private dwellings in North St Marys.
- Median weekly rent
- $340
- Median monthly mortgage
- $1,800
- Average household size
- 2.7 people
- Median weekly family income
- $1,434
- Median weekly personal income
- $597
Community and culture
- Born overseas
- 883 (25%)
- Speaks a language other than English at home
- 729 (21%)
- Aboriginal and/or Torres Strait Islander
- 434 (11%)
Work and education
- Completed Year 12
- 1,082 (35%)
- Labour-force participation
- 44.3%
- Unemployment rate
- 8.7%
- Employed full-time
- 740
- Employed part-time
- 378
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 North St Marys
Based on 2014–2023 records, the warmest month in North St Marys 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 North St Marys
Where is North St Marys?
North St Marys is a suburb of New South Wales, Australia.
What is the population of North St Marys?
At the 2021 Census, North St Marys had a population of about 4,123.
Is North St Marys an advantaged area?
North St Marys has an ABS SEIFA score of 847, where about 1000 is the national average — higher scores indicate greater relative socio-economic advantage. That gives it a Suburb Score of 4 out of 100 — more socio-economically advantaged than about 4% of Australian suburbs.
What is the weather like in North St Marys?
North St Marys 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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