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ABS 2021 Census · Updated 21 May 2026
Garden Island is a well-established middle-ring suburb of Adelaide, Australia, with a population of approximately 4, making it a boutique locality. Located approximately 15 km from the Adelaide CBD, Garden Island is a middle ring area in South Australia. The median household income is $38,948 per year.
Household earnings in Garden Island are below the state average, which may affect long-term capital growth. The short commute to the city centre is a key demand driver.
Official Australia Post postcode for Garden Island. A postcode may cover multiple suburbs.
Australia Post Postcode Finder →Usual resident population at the most recent census.
Weekly median rent for occupied homes. Live rental data integration coming soon.
Annual median household income (before tax) across all households.
Straight-line distance from the suburb centroid to the nearest capital city CBD. Actual driving distance will be longer.
Estimated 1 school within or near this suburb.
Find schools near Garden Island on My School →Estimated 1 park and green spaces near this suburb.
Monthly median mortgage repayment for households currently paying off a mortgage.
Proportion of separate houses versus units, townhouses, and other home types. Useful for investors assessing rental demand mix.
Garden Island is a smaller community of 4 — about 0% of the South Australia suburb median (3,699) — so investors should factor in the narrower buyer pool and longer average time-on-market. Garden Island's median household income of $38,948/year is 52% below the South Australia suburb median ($80,964) — this is an affordability play where returns lean on yield and patient capital growth rather than demographic premium. 15 km from Adelaide places Garden Island in the middle commuter belt, close enough for daily trips by car or rail but at a materially lower price point than inner suburbs.
How Garden Island stacks up against the median of all South Australia suburbs in our dataset. Positive values mean Garden Island sits above the state median; negative means below.
| Metric | Garden Island | SA median | Δ vs state |
|---|---|---|---|
| Population | 4 | 3,699 | -100% |
| Median household income | $38,948/yr | $80,964/yr | -52% |
| Distance to CBD | 15 km | 13 km | +15% |
Pre-inspection briefing for Garden Island — every item is derived from public datasets, with full citations in our data sources page.
Limited buy-and-hold upside: a small population of 4 means liquidity is thin and capital growth tends to lag the wider South Australia market over full cycles.
Median rental data was not captured for Garden Island. Use current realestate.com.au and Domain listings to triangulate a realistic weekly rent before committing, then feed that number into our rental yield calculator.
With a population of 4, the resale market in Garden Island may not reliably reward cosmetic renovations — a longer hold is typically a better strategy at this scale, letting land-value appreciation do the work instead.
Run the numbers on a Garden Island property
Scenario comparison, cash flow analysis, tax modelling, and PDF export — all in one place.
Create free account →Capital-growth expectations for Garden Island are modest for 2026 — incomes 52% below the SA median of $80,964 and a population of 4 suggest gains will lag headline metro markets. Rental fundamentals will need to be verified against live listings, as a clean median rent was not recorded for Garden Island. The EquitySight investment score of 46/100 places Garden Island in the mid tier of Australian suburbs we profile, and overall investor sentiment is cautious heading into the second half of 2026.
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Garden Island scores 46/100 on our EquitySight investment framework — a moderate rating. That score is driven by a population of 4, median household income of $38,948/year. Whether it fits your portfolio depends on whether you are targeting cash flow, capital growth, or a value-add renovation — all three are scored with suburb-specific numbers elsewhere on this page.
The main demand drivers in Garden Island are proximity to Adelaide (15 km), a median household income of $38,948/year, roughly 1 schools and 1 parks within the catchment. Together these shape both owner-occupier and tenant demand and are the factors we weight most heavily in the suburb's investment score.
Garden Island has a usual resident population of approximately 4, compared with a South Australia suburb median of 3,699 — placing it in the lower half of the state's suburbs by size. Population is the clearest proxy for market depth: more residents mean more transactions and typically a shorter average days-on-market on resale.
Garden Island sits 15 km straight-line from the Adelaide CBD. This is comfortable commuter territory, with reasonable rail and road access to the city.
A reliable median rent was not captured for Garden Island. Benchmark expected weekly rent on realestate.com.au and Domain, or the state rental tribunal's rent dashboard. Most Australian investors target a 4–5% gross yield as a baseline.
A reliable median mortgage figure was not captured for Garden Island. Use our loan serviceability calculator to estimate a realistic monthly repayment for your target purchase price and deposit.
Census data was not complete enough in Garden Island to compute a clean rent-to-mortgage coverage. Use current listings to benchmark weekly rent, then plug your expected purchase price into our rental yield calculator to see whether the investment runs cash-flow positive or negative.
The main risks are a thin buyer pool (4 residents), interest-rate sensitivity, below-median household incomes ($38,948 vs $80,964 state median), the broader South Australia market cycle. Each of these is covered in the Risk Factors section above with suburb-specific numbers rather than generic warnings.
Every number on this page comes from the ABS 2021 Census of Population and Housing, Australia Post postcode reference data, and OpenStreetMap amenity tiles. The investment score, strategy verdicts, and comparison table are computed deterministically from those inputs — no opinion, no estimation. See our full methodology and the data sources and licences for the formulas we use.