St Johns, SA
By Lauren McCaleb · Reviewed by Dylan Duncan ·
Around the national middle
St Johns is more socio-economically advantaged than about 47% of the 14,462 Australian suburbs we score, based on the ABS SEIFA index (raw score 982, 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 Johns at a glance
- Population (2021)
- 8
- Median age
- 41
- Median weekly household income
- $2,124
- SEIFA score
- 982
- Coordinates
- -34.3777, 138.9436
St Johns demographics (2021 Census)
The figures below profile St Johns 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 children (0–14) at 50% and 0% of residents were born overseas.
Age profile
| Age group | People | Share |
|---|---|---|
| Children (0–14) | 3 | 50% |
| Youth (15–24) | 0 | 0% |
| Young adults (25–44) | 0 | 0% |
| Mid-life (45–64) | 3 | 50% |
| Seniors (65+) | 0 | 0% |
Share of the 6 people counted by age.
Housing and households
| Dwelling type | Dwellings | Share |
|---|---|---|
| Houses | 5 | 100% |
| Townhouses & semis | 0 | 0% |
| Flats & apartments | 0 | 0% |
Tenure and dwelling shares are of the roughly 5 occupied private dwellings in St Johns.
- Median weekly rent
- $180
- Median monthly mortgage
- $1,614
- Average household size
- 2.3 people
- Median weekly family income
- $2,999
- Median weekly personal income
- $1,374
Community and culture
- Born overseas
- 0 (0%)
- Speaks a language other than English at home
- 0 (0%)
- Aboriginal and/or Torres Strait Islander
- 0 (0%)
Work and education
- Completed Year 12
- 5 (63%)
- Labour-force participation
- 100%
- Employed full-time
- 3
- Employed part-time
- 0
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 Johns
Based on 2014–2023 records, the warmest month in St Johns is January (average daytime high around 29.2°C) and the coolest is July (around 12.9°C). The area receives roughly 589 mm of rain across the year.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 29.2°C | 15.8°C | 30 mm |
| Feb | 27.7°C | 15.1°C | 26 mm |
| Mar | 25.2°C | 13.8°C | 20 mm |
| Apr | 21.1°C | 11.5°C | 46 mm |
| May | 16.3°C | 8.7°C | 57 mm |
| Jun | 13.4°C | 6.6°C | 63 mm |
| Jul | 12.9°C | 5.9°C | 74 mm |
| Aug | 13.6°C | 5.9°C | 88 mm |
| Sep | 16.5°C | 7.3°C | 61 mm |
| Oct | 20.7°C | 9.6°C | 48 mm |
| Nov | 23.4°C | 11.2°C | 49 mm |
| Dec | 27°C | 13.6°C | 27 mm |
Climate normals, 2014–2023 (Open-Meteo, ERA5 reanalysis).
Common questions about St Johns
Where is St Johns?
St Johns is a suburb of South Australia, Australia.
What is the population of St Johns?
At the 2021 Census, St Johns had a population of about 8.
Is St Johns an advantaged area?
St Johns has an ABS SEIFA score of 982, where about 1000 is the national average — higher scores indicate greater relative socio-economic advantage. That gives it a Suburb Score of 47 out of 100 — more socio-economically advantaged than about 47% of Australian suburbs.
What is the weather like in St Johns?
St Johns has average daytime highs of about 20.6°C and overnight lows of about 10.4°C, with roughly 589 mm of rain across the year (based on 2014–2023 climate normals).
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