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ABS 2021 Census · Updated 21 May 2026
Illawong is an outer-metropolitan suburb of Sydney, Australia, with a population of approximately 7,427, making it a smaller community. Located approximately 21 km from the Sydney CBD, Illawong is a outer metro area in New South Wales. The median household income is $144,456 per year.
Above-average earnings in Illawong support sustained property values.
Official Australia Post postcode for Illawong. 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 2 schools within or near this suburb.
Find schools near Illawong on My School →Estimated 3 parks 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.
Illawong's population of 7,427 sits 39% above the New South Wales suburb median of 5,325, giving it a wider tenant and buyer catchment than the average NSW locality. Median household income of $144,456/year runs 48% above the New South Wales suburb median of $97,552, indicating strong purchasing power and the type of demographic profile that tends to sustain premium property prices through market cycles. Median weekly rent of $650 equates to $2,817/month — about 95% of the median mortgage repayment of $2,976/month — meaning rental income covers most of a typical owner's repayment and this is a genuine cash-flow suburb before tax benefits. 21 km from Sydney places Illawong in the middle commuter belt, close enough for daily trips by car or rail but at a materially lower price point than inner suburbs.
This suburb suits long-term investors due to steady population growth and affordable entry prices. Look for established streets close to schools and shops rather than raw new-estate land. Local rents consume roughly 23% of household income — a useful sanity check on tenant affordability.
How Illawong stacks up against the median of all New South Wales suburbs in our dataset. Positive values mean Illawong sits above the state median; negative means below.
| Metric | Illawong | NSW median | Δ vs state |
|---|---|---|---|
| Population | 7,427 | 5,325 | +39% |
| Median household income | $144,456/yr | $97,552/yr | +48% |
| Median rent (weekly) | $650 | $430 | +51% |
| Median mortgage (monthly) | $2,976 | $2,167 | +37% |
| Distance to CBD | 21 km | 45 km | -53% |
| Separate houses | 89% | 76% | +13pp |
Pre-inspection briefing for Illawong — every item is derived from public datasets, with full citations in our data sources page.
Strong buy-and-hold fundamentals: household incomes run 48% above the New South Wales suburb median ($144,456 vs $97,552), and the 21 km CBD distance keeps this suburb in the primary demand zone. In New South Wales, suburbs with this profile have historically clustered in the upper tercile of 10-year capital growth.
Strong rental coverage: $650/week (~$2,817/month) covers 95% of the $2,976/month median mortgage repayment, so the shortfall sits at just $159/month. Investors targeting positive cash flow should shortlist this suburb.
A dwelling mix skewed to houses (89% vs 76% NSW median) combined with a population of 7,427 creates a deeper market for value-add renovations — older stock, separate titles and stronger buyer competition are the usual pattern here.
Run the numbers on a Illawong property
Scenario comparison, cash flow analysis, tax modelling, and PDF export — all in one place.
Create free account →Illawong enters 2026 with a demographic tailwind — household incomes 48% above the New South Wales suburb median of $97,552 and a population of 7,427 give it the depth and purchasing power to outperform the wider NSW market over the next 12–18 months. Rental coverage runs at ~95% of the typical mortgage ($2,817/month rent vs $2,976/month repayment), keeping cash flow in positive or near-neutral territory. The EquitySight investment score of 77/100 places Illawong in the upper-middle tier of Australian suburbs we profile, and overall investor sentiment is constructive heading into the second half of 2026.
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Illawong scores 77/100 on our EquitySight investment framework — a good rating. That score is driven by a population of 7,427, median household income of $144,456/year and median weekly rent of $650. 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 Illawong are proximity to Sydney (21 km), an above-state-median household income of $144,456/year, a dwelling mix that is 89% separate houses, roughly 2 schools and 3 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.
Illawong has a usual resident population of approximately 7,427, compared with a New South Wales suburb median of 5,325 — placing it in the upper 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.
Illawong sits 21 km straight-line from the Sydney CBD. This is comfortable commuter territory, with reasonable rail and road access to the city.
The most recent census recorded a median weekly rent of $650 in Illawong, equating to approximately $33,800/year in gross rental income (state median $430/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 Illawong is $2,976, or approximately $35,712/year (vs $2,167/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 $650 works out to $2,817/month, covering 95% of the median mortgage repayment of $2,976/month. That leaves a $159/month shortfall (around $1,908/year before tax benefits), so a typical owner-occupier-priced property here is negatively geared. 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 interest-rate sensitivity on the $2,976 median mortgage, the broader New South Wales 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.