Second Valley Postcode
South Australia
Income, rent and SEIFA figures are from the ABS 2021 Census and are reported in 2021 dollars, not adjusted for subsequent inflation.
How Second Valley Compares
Second Valley vs the SA average and the national average (2021 Census, population-weighted).
| Metric | Second Valley | SA avg | AU avg |
|---|---|---|---|
| Household income/wk | $1,019 -SA | $1,545 | $1,836 |
| Rent/wk | $200 -SA | $308 | $390 |
| Mortgage/month | $1,400 -SA | $1,558 | $1,958 |
| Median age | 65 | 45.0 | 45.0 |
| SEIFA decile | 2/10 -SA | 5.0/10 | 6.0/10 |
| Unemployment | 0.0% -SA | 6.0% | 5.0% |
Green pill = at least 10% above the SA average; red = at least 10% below; grey = within 10%. For unemployment, colour polarity is inverted: lower is better.
Second Valley is a locality 75 km from Adelaide in South Australia, classified as inner regional by the ABS. The postcode is 5204. It falls within the South Australia - South East region. The local government area is Yankalilla.
According to the 2021 Census, Second Valley has a population of 154 with a median age of 65. The median weekly household income is $1,019, below the SA average. The Indigenous population is 4 (2.6% of residents).
Housing in Second Valley includes a median weekly rent of $200, median monthly mortgage repayment of $1,400, with 80 total dwellings. Housing costs in the area sit below the SA average. Owner-occupied dwellings (owned or mortgaged) make up 83.3% of housing.
On the SEIFA Index of Relative Socio-economic Advantage and Disadvantage, Second Valley scores in decile 2 out of 10, which is well below the national average.
Second Valley is part of the Fleurieu - Kangaroo Island statistical area in South Australia.
Second Valley Details
| Postcode | 5204 |
| State | South Australia (SA) |
| Phone Area Code | 08 |
| Population (2021) | 154 |
| Median Age | 65 years |
| Median Household Income (Census 2021) | $1,019/week |
| Median Personal Income (Census 2021) | $515/week |
| Median Weekly Rent (Census 2021) | $200 |
| Median Monthly Mortgage (Census 2021) | $1,400 |
| Average Household Size | 1.8 persons |
| Area | 41.1 km² |
| Population Density | 4/km² |
| Total Dwellings | 80 |
| Australian Citizens | 83.1% |
| Indigenous Population | 4 (2.6%) |
| Unemployment Rate | 0.0% |
| SEIFA IRSAD Decile | 2/10 (well below average) |
| Latitude | -35.5367772 |
| Longitude | 138.2322002 |
| Distance from Adelaide | 75 km |
| Region (SA4) | South Australia - South East |
| Area (SA3) | Fleurieu - Kangaroo Island |
| Local Government | Yankalilla |
| Federal Electorate | Mayo |
Age Profile
Show counts
| 0–14 years | 12 (7.8%) |
| 15–24 years | 3 (1.9%) |
| 25–44 years | 14 (9.1%) |
| 45–64 years | 50 (32.5%) |
| 65+ years | 70 (45.5%) |
Housing Tenure
SEIFA Socio-economic Index
Index of Relative Socio-economic Advantage and Disadvantage (IRSAD), decile 2 of 10. Higher deciles indicate more advantage.
Health Conditions (2021 Census)
| Arthritis | 31 (20.1%) |
| Asthma | 11 (7.1%) |
| Heart Disease | 9 (5.8%) |
| Diabetes | 8 (5.2%) |
| Cancer | 7 (4.5%) |
| Lung Condition | 5 (3.2%) |
Long-term health conditions self-reported in the 2021 Census. Persons may report more than one condition.
Motor Vehicles per Dwelling
| No vehicle | 0 (0.0%) |
| 1 vehicle | 30 (41.1%) |
| 2 vehicles | 27 (37.0%) |
| 3+ vehicles | 16 (21.9%) |
Suburbs Near Second Valley
Same Postcode (5204)
More Second Valley Data
Page last reviewed . Data sources: Australian Bureau of Statistics 2021 Census (CC BY 4.0), SEIFA 2021 IRSAD, ACARA school profiles 2025. How this data is sourced.