South Australia · Postcode 5223
Cassini postcode and suburb data
South Australia · Phone area code 08 · 148 km from Adelaide
Suburb snapshot
Cassini at a glance vs SA
Fast facts and benchmark bars show the suburb's key postcode, Census, SEIFA, school and LGA signals in context.
Quick facts
Benchmarks against SA
Income, rent and SEIFA figures are from the ABS 2021 Census and are reported in 2021 dollars, not adjusted for subsequent inflation.
Detailed comparison table
Cassini vs the SA average and the national average, using population-weighted 2021 Census data.
| Metric | Cassini | SA avg | AU avg |
|---|---|---|---|
| Household income/wk | $1,542 ≈SA | $1,545 | $1,836 |
| Rent/wk | $100 -SA | $308 | $390 |
| Mortgage/month | $433 -SA | $1,558 | $1,958 |
| Median age | 41 | 45.0 | 45.0 |
| SEIFA decile | 8/10 +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.
Cassini is a remote community in South Australia, with postcode 5223. It lies roughly 148 km from Adelaide, classified by the ABS as remote Australia. The area is administered by Kangaroo Island.
According to the 2021 Census, Cassini has a population of 73 with a median age of 41. The median weekly household income is $1,542, close to the SA average.
Housing in Cassini includes a median weekly rent of $100, median monthly mortgage repayment of $433, with 23 total dwellings. Housing costs in the area sit below the SA average. Owner-occupied dwellings (owned or mortgaged) make up 100.0% of housing.
On the SEIFA Index of Relative Socio-economic Advantage and Disadvantage, Cassini scores in decile 8 out of 10, which is above the national average.
Cassini is part of the Fleurieu - Kangaroo Island statistical area in South Australia.
Cassini details
Location, Census, housing, SEIFA and geography fields used across this profile.
| Postcode | 5223 |
| State | South Australia (SA) |
| Phone Area Code | 08 |
| Population (2021) | 73 |
| Median Age | 41 years |
| Median Household Income (Census 2021) | $1,542/week |
| Median Personal Income (Census 2021) | $766/week |
| Median Weekly Rent (Census 2021) | $100 |
| Median Monthly Mortgage (Census 2021) | $433 |
| Average Household Size | 3 persons |
| Area | 292.1 km² |
| Population Density | 0/km² |
| Total Dwellings | 23 |
| Australian Citizens | 91.8% |
| Unemployment Rate | 0.0% |
| SEIFA IRSAD Decile | 8/10 (above average) |
| Latitude | -35.6218871 |
| Longitude | 137.2147032 |
| Distance from Adelaide | 148 km |
| Region (SA4) | South Australia - South East |
| Area (SA3) | Fleurieu - Kangaroo Island |
| Local Government | Kangaroo Island |
| Federal Electorate | Mayo |
| State Electorate | Mawson |
| Time Zone | ACST (UTC+9:30), Australia/Adelaide (standard time) |
Age Profile
Show counts
| 0–14 years | 19 (26.0%) |
| 15–24 years | 0 (0.0%) |
| 25–44 years | 18 (24.7%) |
| 45–64 years | 16 (21.9%) |
| 65+ years | 18 (24.7%) |
Housing Tenure
SEIFA socio-economic index
Health Conditions (2021 Census)
| Asthma | 9 (12.3%) |
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 | 5 (22.7%) |
| 2 vehicles | 9 (40.9%) |
| 3+ vehicles | 8 (36.4%) |
Suburbs Near Cassini
Same Postcode (5223)
More Cassini 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.