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ABS 2021 Census · Updated 21 May 2026
Castle Cove is a well-established middle-ring suburb of Sydney, Australia, with a population of approximately 2,643, making it a boutique locality. Located approximately 9 km from the Sydney CBD, Castle Cove is a middle ring area in New South Wales. The median household income is $178,828 per year.
Castle Cove benefits from a high-income resident base, supporting premium property pricing. The short commute to the city centre is a key demand driver.
Official Australia Post postcode for Castle Cove. 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 Castle Cove 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.
Castle Cove is a smaller community of 2,643 — about 50% of the New South Wales suburb median (5,325) — so investors should factor in the narrower buyer pool and longer average time-on-market. Median household income of $178,828/year runs 83% 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 $1,000 equates to $4,333/month — about 108% of the median mortgage repayment of $4,000/month — meaning rental income covers most of a typical owner's repayment and this is a genuine cash-flow suburb before tax benefits. At 9 km from the Sydney CBD, Castle Cove sits inside the high-demand inner ring — properties here compete directly with the city's employment, transport and amenity networks.
This suburb suits long-term investors looking for a balance of rental yield and capital growth. Schools and transport underpin family demand. Local rents consume roughly 29% of household income — a useful sanity check on tenant affordability.
How Castle Cove stacks up against the median of all New South Wales suburbs in our dataset. Positive values mean Castle Cove sits above the state median; negative means below.
| Metric | Castle Cove | NSW median | Δ vs state |
|---|---|---|---|
| Population | 2,643 | 5,325 | -50% |
| Median household income | $178,828/yr | $97,552/yr | +83% |
| Median rent (weekly) | $1,000 | $430 | +133% |
| Median mortgage (monthly) | $4,000 | $2,167 | +85% |
| Distance to CBD | 9 km | 45 km | -80% |
| Separate houses | 84% | 76% | +8pp |
Pre-inspection briefing for Castle Cove — every item is derived from public datasets, with full citations in our data sources page.
Strong buy-and-hold fundamentals: household incomes run 83% above the New South Wales suburb median ($178,828 vs $97,552), and the 9 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: $1,000/week (~$4,333/month) covers 108% of the $4,000/month median mortgage repayment, so the shortfall sits at just $0/month. Investors targeting positive cash flow should shortlist this suburb.
With 84% houses in a 2,643-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 Castle Cove property
Scenario comparison, cash flow analysis, tax modelling, and PDF export — all in one place.
Create free account →Castle Cove enters 2026 with a demographic tailwind — household incomes 83% above the New South Wales suburb median of $97,552 and a population of 2,643 give it the depth and purchasing power to outperform the wider NSW market over the next 12–18 months. Rental coverage runs at ~108% of the typical mortgage ($4,333/month rent vs $4,000/month repayment), keeping cash flow in positive or near-neutral territory. The EquitySight investment score of 73/100 places Castle Cove 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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Castle Cove scores 73/100 on our EquitySight investment framework — a good rating. That score is driven by a population of 2,643, median household income of $178,828/year and median weekly rent of $1,000. 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 Castle Cove are proximity to Sydney (9 km), an above-state-median household income of $178,828/year, a dwelling mix that is 84% 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.
Castle Cove has a usual resident population of approximately 2,643, compared with a New South Wales suburb median of 5,325 — 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.
Castle Cove sits 9 km straight-line from the Sydney CBD. This is inner-ring territory — pricing competes directly with established Sydney employment nodes.
The most recent census recorded a median weekly rent of $1,000 in Castle Cove, equating to approximately $52,000/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 Castle Cove is $4,000, or approximately $48,000/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 $1,000 works out to $4,333/month, covering 108% of the median mortgage repayment of $4,000/month. That means rent exceeds the median repayment by roughly $333/month, so on these numbers Castle Cove 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 (2,643 residents), interest-rate sensitivity on the $4,000 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.