South Australia · Postcode 5153
Biggs Flat postcode and suburb data
South Australia · Phone area code 08 · 23 km from Adelaide
Suburb snapshot
Biggs Flat 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.
Where Biggs Flat ranks: SEIFA decile 10 puts it in the top 20% of Australia for socio-economic advantage.
ABS Census 2021 · SEIFA 2021Detailed comparison table
Biggs Flat vs the SA average and the national average, using population-weighted 2021 Census data.
| Metric | Biggs Flat | SA avg | AU avg | Greater Adelaide |
|---|---|---|---|---|
| Household income/wk | $1,625 ≈SA | $1,545 | $1,836 | $1,620 |
| Rent/wk | $350 +SA | $308 | $390 | $329 |
| Mortgage/month | $2,980 +SA | $1,558 | $1,958 | $1,666 |
| Median age | 43 | 45.0 | 45.0 | 42.0 |
| SEIFA decile | 10/10 +SA | 5.0/10 | 6.0/10 | 7.0/10 |
| Unemployment | 14.0% +SA | 6.0% | 5.0% | 6.0% |
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.
Biggs Flat is a locality 23 km from Adelaide in South Australia, classified as inner regional by the ABS. The postcode is 5153. It falls within the South Australia - South East region. The local government area is Mount Barker.
According to the 2021 Census, Biggs Flat has a population of 84 with a median age of 43. The median weekly household income is $1,625, close to the SA average. The unemployment rate is 14.0%, higher than the SA average.
Housing in Biggs Flat includes a median weekly rent of $350, median monthly mortgage repayment of $2,980, with 29 total dwellings. These housing costs sit above 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, Biggs Flat scores in decile 10 out of 10, which is well above the national average.
Biggs Flat is part of the Fleurieu - Kangaroo Island statistical area in South Australia.
Biggs Flat details
Location, Census, housing, SEIFA and geography fields used across this profile.
| Postcode | 5153 |
| State | South Australia (SA) |
| Phone Area Code | 08 |
| Population (2021) | 84 |
| Median Age | 43 years |
| Median Household Income (Census 2021) | $1,625/week |
| Median Personal Income (Census 2021) | $756/week |
| Median Weekly Rent (Census 2021) | $350 |
| Median Monthly Mortgage (Census 2021) | $2,980 |
| Average Household Size | 2.7 persons |
| Area | 4.8 km² |
| Population Density | 18/km² |
| Total Dwellings | 29 |
| Australian Citizens | 83.3% |
| Unemployment Rate | 14.0% |
| SEIFA IRSAD Decile | 10/10 (well above average) |
| Latitude | -35.0727667 |
| Longitude | 138.7819214 |
| Distance from Adelaide | 23 km |
| Region (SA4) | South Australia - South East |
| Area (SA3) | Fleurieu - Kangaroo Island |
| Local Government | Mount Barker |
| Federal Electorate | Mayo |
| State Electorate | Heysen |
| Time Zone | ACST (UTC+9:30), Australia/Adelaide (standard time) |
Age Profile
Show counts
| 0–14 years | 21 (25.0%) |
| 15–24 years | 8 (9.5%) |
| 25–44 years | 21 (25.0%) |
| 45–64 years | 25 (29.8%) |
| 65+ years | 11 (13.1%) |
Housing Tenure
SEIFA socio-economic index
Health Conditions (2021 Census)
| Arthritis | 9 (10.7%) |
| Asthma | 6 (7.1%) |
| Heart Disease | 4 (4.8%) |
Long-term health conditions self-reported in the 2021 Census. Persons may report more than one condition.
Motor Vehicles per Dwelling
| No vehicle | 4 (12.5%) |
| 1 vehicle | 9 (28.1%) |
| 2 vehicles | 8 (25.0%) |
| 3+ vehicles | 11 (34.4%) |
Suburbs Near Biggs Flat
Same Postcode (5153)
More Biggs Flat 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.