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South Australia · Postcode 5159
Flagstaff Hill postcode and suburb data
South Australia · Phone area code 08 · 14 km from Adelaide
Suburb snapshot
Flagstaff Hill 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 Flagstaff Hill ranks: household income is in the top 25% of SA suburbs; rents are among the top 10% in SA; SEIFA decile 9 puts it in the top 20% of Australia for socio-economic advantage.
ABS Census 2021 · SEIFA 2021Detailed comparison table
Flagstaff Hill vs the SA average and the national average, using population-weighted 2021 Census data.
| Metric | Flagstaff Hill | SA avg | AU avg | Greater Adelaide |
|---|---|---|---|---|
| Household income/wk | $2,080 +SA | $1,545 | $1,836 | $1,620 |
| Rent/wk | $385 +SA | $308 | $390 | $329 |
| Mortgage/month | $1,733 +SA | $1,558 | $1,958 | $1,666 |
| Median age | 43 | 45.0 | 45.0 | 42.0 |
| SEIFA decile | 9/10 +SA | 5.0/10 | 6.0/10 | 7.0/10 |
| Unemployment | 4.2% -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.
Flagstaff Hill is a locality 14 km from Adelaide in South Australia, classified as inner regional by the ABS. The postcode is 5159. It falls within the Adelaide - South region. The local government area is Onkaparinga.
According to the 2021 Census, Flagstaff Hill has a population of 10,184 with a median age of 43. The median weekly household income is $2,080, above the SA average. The unemployment rate is 4.2%, lower than the SA average. The Indigenous population is 79 (0.8% of residents).
Housing in Flagstaff Hill includes a median weekly rent of $385, median monthly mortgage repayment of $1,733, with 3,617 total dwellings. These housing costs sit above the SA average. Owner-occupied dwellings (owned or mortgaged) make up 89.5% of housing.
On the SEIFA Index of Relative Socio-economic Advantage and Disadvantage, Flagstaff Hill scores in decile 9 out of 10, which is well above the national average.
Schools in Flagstaff Hill include Flagstaff Hill Primary School and Craigburn Primary School.
Flagstaff Hill is part of the Onkaparinga statistical area in South Australia.
Flagstaff Hill details
Location, Census, housing, SEIFA and geography fields used across this profile.
| Postcode | 5159 |
| State | South Australia (SA) |
| Phone Area Code | 08 |
| Population (2021) | 10,184 |
| Median Age | 43 years |
| Median Household Income (Census 2021) | $2,080/week |
| Median Personal Income (Census 2021) | $844/week |
| Median Weekly Rent (Census 2021) | $385 |
| Median Monthly Mortgage (Census 2021) | $1,733 |
| Average Household Size | 2.7 persons |
| Area | 7.9 km² |
| Population Density | 1288/km² |
| Total Dwellings | 3,617 |
| Australian Citizens | 91.5% |
| Indigenous Population | 79 (0.8%) |
| Unemployment Rate | 4.2% |
| SEIFA IRSAD Decile | 9/10 (well above average) |
| Latitude | -35.05 |
| Longitude | 138.583333 |
| Distance from Adelaide | 14 km |
| Region (SA4) | Adelaide - South |
| Area (SA3) | Onkaparinga |
| Local Government | Onkaparinga |
| Federal Electorate | Kingston |
| State Electorate | Hurtle Vale |
| Time Zone | ACST (UTC+9:30), Australia/Adelaide (standard time) |
Age Profile
Show counts
| 0–14 years | 1,768 (17.4%) |
| 15–24 years | 1,236 (12.1%) |
| 25–44 years | 2,308 (22.7%) |
| 45–64 years | 2,855 (28.0%) |
| 65+ years | 2,020 (19.8%) |
Housing Tenure
SEIFA socio-economic index
Health Conditions (2021 Census)
| Arthritis | 892 (8.8%) |
| Asthma | 831 (8.2%) |
| Diabetes | 450 (4.4%) |
| Heart Disease | 444 (4.4%) |
| Cancer | 339 (3.3%) |
| Lung Condition | 148 (1.5%) |
| Dementia | 90 (0.9%) |
Long-term health conditions self-reported in the 2021 Census. Persons may report more than one condition.
Motor Vehicles per Dwelling
| No vehicle | 56 (1.6%) |
| 1 vehicle | 860 (23.8%) |
| 2 vehicles | 1,728 (47.9%) |
| 3+ vehicles | 967 (26.8%) |
Schools in Flagstaff Hill
ACARA 2025 school profiles for schools located in Flagstaff Hill. ICSEA is shown where ACARA publishes it.
Suburbs Near Flagstaff Hill
Same Postcode (5159)
More Flagstaff Hill 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.