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ABS 2021 Census · Updated 21 May 2026
Castambul is a well-established middle-ring suburb of Adelaide, Australia, with a population of approximately 18, making it a boutique locality. Located approximately 16 km from the Adelaide CBD, Castambul is a middle ring area in South Australia. The median household income is $58,448 per year.
Castambul's income profile suggests a value-oriented market with competitive purchase prices.
Official Australia Post postcode for Castambul. 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 Castambul 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.
Castambul is a smaller community of 18 — 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. Castambul's median household income of $58,448/year is 28% 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. 16 km from Adelaide places Castambul in the middle commuter belt, close enough for daily trips by car or rail but at a materially lower price point than inner suburbs. Only 27% of dwellings are separate houses (vs 73% state median), so this is a unit-heavy market where body-corporate decisions and strata supply meaningfully shape investor returns.
How Castambul stacks up against the median of all South Australia suburbs in our dataset. Positive values mean Castambul sits above the state median; negative means below.
| Metric | Castambul | SA median | Δ vs state |
|---|---|---|---|
| Population | 18 | 3,699 | -100% |
| Median household income | $58,448/yr | $80,964/yr | -28% |
| Median mortgage (monthly) | $3,900 | $1,616 | +141% |
| Distance to CBD | 16 km | 13 km | +23% |
| Separate houses | 27% | 73% | -46pp |
Pre-inspection briefing for Castambul — every item is derived from public datasets, with full citations in our data sources page.
Limited buy-and-hold upside: a small population of 18 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 Castambul. 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.
Only 27% of dwellings are separate houses (vs 73% SA median) — this is a unit and townhouse market, where cosmetic flips struggle against body-corporate restrictions, thinner after-reno uplift and competing new supply.
Run the numbers on a Castambul property
Scenario comparison, cash flow analysis, tax modelling, and PDF export — all in one place.
Create free account →Capital-growth expectations for Castambul are modest for 2026 — incomes 28% below the SA median of $80,964 and a population of 18 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 Castambul. The EquitySight investment score of 41/100 places Castambul 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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Castambul scores 41/100 on our EquitySight investment framework — a moderate rating. That score is driven by a population of 18, median household income of $58,448/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 Castambul are proximity to Adelaide (16 km), a median household income of $58,448/year, a dwelling mix that is 27% separate houses, 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.
Castambul has a usual resident population of approximately 18, 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.
Castambul sits 16 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 Castambul. 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.
The median monthly mortgage repayment in Castambul is $3,900, or approximately $46,800/year (vs $1,616/month state median). Stress-test your own borrowing at rates 1–2 percentage points above today's to make sure you can still service the loan through an RBA tightening cycle.
Census data was not complete enough in Castambul 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 (18 residents), interest-rate sensitivity on the $3,900 median mortgage, below-median household incomes ($58,448 vs $80,964 state median), a unit-heavy dwelling mix (27% houses) where body-corporate costs and apartment supply affect resale, 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.