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ABS 2021 Census · Updated 21 May 2026
Iron Knob is a coastal suburb in South Australia, Australia, with a population of approximately 110, making it a boutique locality. Located approximately 278 km from the Adelaide CBD, Iron Knob is a coastal area in South Australia. The median household income is $28,912 per year.
Lower income levels in Iron Knob typically translate to more affordable entry points for investors. Coastal lifestyle appeal adds a premium that supports long-term demand.
Official Australia Post postcode for Iron Knob. 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 Iron Knob 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.
Iron Knob is a smaller community of 110 — about 3% of the South Australia suburb median (3,699) — so investors should factor in the narrower buyer pool and longer average time-on-market. Iron Knob's median household income of $28,912/year is 64% 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. Median weekly rent of $130 equates to $563/month — about 144% of the median mortgage repayment of $390/month — meaning rental income covers most of a typical owner's repayment and this is a genuine cash-flow suburb before tax benefits. Iron Knob is 278 km from Adelaide, so the local market tracks regional employment and lifestyle drivers more than CBD-driven commuter demand.
How Iron Knob stacks up against the median of all South Australia suburbs in our dataset. Positive values mean Iron Knob sits above the state median; negative means below.
| Metric | Iron Knob | SA median | Δ vs state |
|---|---|---|---|
| Population | 110 | 3,699 | -97% |
| Median household income | $28,912/yr | $80,964/yr | -64% |
| Median rent (weekly) | $130 | $320 | -59% |
| Median mortgage (monthly) | $390 | $1,616 | -76% |
| Distance to CBD | 278 km | 13 km | +2038% |
| Separate houses | 67% | 73% | -6pp |
Pre-inspection briefing for Iron Knob — every item is derived from public datasets, with full citations in our data sources page.
Limited buy-and-hold upside: a small population of 110 means liquidity is thin and capital growth tends to lag the wider South Australia market over full cycles.
Strong rental coverage: $130/week (~$563/month) covers 144% of the $390/month median mortgage repayment, so the shortfall sits at just $0/month. Investors targeting positive cash flow should shortlist this suburb.
With 67% houses in a 110-person market, renovation margins depend on individual street and aspect rather than any suburb-wide story — do comparable-sales analysis before committing capital.
Run the numbers on a Iron Knob property
Scenario comparison, cash flow analysis, tax modelling, and PDF export — all in one place.
Create free account →Capital-growth expectations for Iron Knob are modest for 2026 — incomes 64% below the SA median of $80,964 and a population of 110 suggest gains will lag headline metro markets. Rental coverage runs at ~144% of the typical mortgage ($563/month rent vs $390/month repayment), keeping cash flow in positive or near-neutral territory. The EquitySight investment score of 30/100 places Iron Knob in the lower tier of Australian suburbs we profile, and overall investor sentiment is cautious heading into the second half of 2026.
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Iron Knob scores 30/100 on our EquitySight investment framework — a weak rating. That score is driven by a population of 110, median household income of $28,912/year and median weekly rent of $130. 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 Iron Knob are a median household income of $28,912/year, a dwelling mix that is 67% 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.
Iron Knob has a usual resident population of approximately 110, 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.
Iron Knob sits 278 km straight-line from the Adelaide CBD. This is a regional market where CBD distance is only indicative — local industry diversity and commute alternatives matter more.
The most recent census recorded a median weekly rent of $130 in Iron Knob, equating to approximately $6,760/year in gross rental income (state median $320/week). Market rents have typically drifted above the recorded figure — verify against current listings on realestate.com.au and Domain before making an offer.
The median monthly mortgage repayment in Iron Knob is $390, or approximately $4,680/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.
A median weekly rent of $130 works out to $563/month, covering 144% of the median mortgage repayment of $390/month. That means rent exceeds the median repayment by roughly $173/month, so on these numbers Iron Knob leans cash-flow-positive before accounting for strata, council rates, insurance and maintenance. Actual cash flow depends on your deposit, loan terms, ownership costs and marginal tax rate — run the full numbers in our rental yield calculator.
The main risks are a thin buyer pool (110 residents), interest-rate sensitivity on the $390 median mortgage, below-median household incomes ($28,912 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.