South Australia · Postcode 5068
Trinity Gardens postcode and suburb data
South Australia · Phone area code 08 · 4 km from Adelaide
Suburb snapshot
Trinity Gardens 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 Trinity Gardens 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
Trinity Gardens vs the SA average and the national average, using population-weighted 2021 Census data.
| Metric | Trinity Gardens | SA avg | AU avg | Greater Adelaide |
|---|---|---|---|---|
| Household income/wk | $2,006 +SA | $1,545 | $1,836 | $1,620 |
| Rent/wk | $375 +SA | $308 | $390 | $329 |
| Mortgage/month | $2,184 +SA | $1,558 | $1,958 | $1,666 |
| Median age | 40 | 45.0 | 45.0 | 42.0 |
| SEIFA decile | 9/10 +SA | 5.0/10 | 6.0/10 | 7.0/10 |
| Unemployment | 3.3% -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.
Trinity Gardens is a coastal suburb of Adelaide in South Australia, with postcode 5068. It sits about 4 km from the Adelaide CBD, within the Norwood Payneham and St Peters local government area. The suburb footprint covers roughly 0.6 square kilometres.
According to the 2021 Census, Trinity Gardens has a population of 1,264 with a median age of 40. The median weekly household income is $2,006, above the SA average. The unemployment rate is 3.3%, lower than the SA average. The Indigenous population is 4 (0.3% of residents).
Housing in Trinity Gardens includes a median weekly rent of $375, median monthly mortgage repayment of $2,184, with 482 total dwellings. These housing costs sit above the SA average. Owner-occupied dwellings (owned or mortgaged) make up 73.2% of housing.
On the SEIFA Index of Relative Socio-economic Advantage and Disadvantage, Trinity Gardens scores in decile 9 out of 10, which is well above the national average.
Trinity Gardens is served by Trinity Gardens School.
Trinity Gardens is part of the Norwood - Payneham - St Peters statistical area in South Australia.
Trinity Gardens details
Location, Census, housing, SEIFA and geography fields used across this profile.
| Postcode | 5068 |
| State | South Australia (SA) |
| Phone Area Code | 08 |
| Population (2021) | 1,264 |
| Median Age | 40 years |
| Median Household Income (Census 2021) | $2,006/week |
| Median Personal Income (Census 2021) | $923/week |
| Median Weekly Rent (Census 2021) | $375 |
| Median Monthly Mortgage (Census 2021) | $2,184 |
| Average Household Size | 2.6 persons |
| Area | 0.6 km² |
| Population Density | 2119/km² |
| Total Dwellings | 482 |
| Australian Citizens | 88.9% |
| Indigenous Population | 4 (0.3%) |
| Unemployment Rate | 3.3% |
| SEIFA IRSAD Decile | 9/10 (well above average) |
| Latitude | -34.91111 |
| Longitude | 138.64453 |
| Distance from Adelaide | 4 km |
| Region (SA4) | Adelaide - Central and Hills |
| Area (SA3) | Norwood - Payneham - St Peters |
| Local Government | Norwood Payneham and St Peters |
| Federal Electorate | Sturt |
| State Electorate | Dunstan |
| Time Zone | ACST (UTC+9:30), Australia/Adelaide (standard time) |
Age Profile
Show counts
| 0–14 years | 221 (17.5%) |
| 15–24 years | 178 (14.1%) |
| 25–44 years | 307 (24.3%) |
| 45–64 years | 350 (27.7%) |
| 65+ years | 215 (17.0%) |
Housing Tenure
SEIFA socio-economic index
Health Conditions (2021 Census)
| Arthritis | 93 (7.4%) |
| Asthma | 72 (5.7%) |
| Diabetes | 53 (4.2%) |
| Cancer | 43 (3.4%) |
| Heart Disease | 41 (3.2%) |
| Lung Condition | 14 (1.1%) |
| Dementia | 6 (0.5%) |
Long-term health conditions self-reported in the 2021 Census. Persons may report more than one condition.
Motor Vehicles per Dwelling
| No vehicle | 35 (7.4%) |
| 1 vehicle | 160 (33.8%) |
| 2 vehicles | 189 (40.0%) |
| 3+ vehicles | 89 (18.8%) |
Schools in Trinity Gardens
ACARA 2025 school profiles for schools located in Trinity Gardens. ICSEA is shown where ACARA publishes it.
Suburbs Near Trinity Gardens
Same Postcode (5068)
More Trinity Gardens 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.