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ABS 2021 Census · Updated 21 May 2026
St Clair is a well-established middle-ring suburb of Adelaide, Australia, with a population of approximately 2,634, making it a boutique locality. Located approximately 9 km from the Adelaide CBD, St Clair is a middle ring area in South Australia. The median household income is $98,280 per year.
Above-average earnings in St Clair support sustained property values. The short commute to the city centre is a key demand driver.
Official Australia Post postcode for St Clair. 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 St Clair 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.
St Clair is a smaller community of 2,634 — about 71% of the South Australia suburb median (3,699) — so investors should factor in the narrower buyer pool and longer average time-on-market. Median household income of $98,280/year runs 21% above the South Australia suburb median of $80,964, indicating strong purchasing power and the type of demographic profile that tends to sustain premium property prices through market cycles. Median weekly rent of $360 equates to $1,560/month — about 90% of the median mortgage repayment of $1,733/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 Adelaide CBD, St Clair sits inside the high-demand inner ring — properties here compete directly with the city's employment, transport and amenity networks. Only 32% 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.
Middle-ring locations like this one historically reward patient holders — focus on homes near catchment-zone schools and major transport. Local rents consume roughly 19% of household income — a useful sanity check on tenant affordability.
How St Clair stacks up against the median of all South Australia suburbs in our dataset. Positive values mean St Clair sits above the state median; negative means below.
| Metric | St Clair | SA median | Δ vs state |
|---|---|---|---|
| Population | 2,634 | 3,699 | -29% |
| Median household income | $98,280/yr | $80,964/yr | +21% |
| Median rent (weekly) | $360 | $320 | +13% |
| Median mortgage (monthly) | $1,733 | $1,616 | +7% |
| Distance to CBD | 9 km | 13 km | -31% |
| Separate houses | 32% | 73% | -41pp |
Pre-inspection briefing for St Clair — every item is derived from public datasets, with full citations in our data sources page.
Strong buy-and-hold fundamentals: household incomes run 21% above the South Australia suburb median ($98,280 vs $80,964), and the 9 km CBD distance keeps this suburb in the primary demand zone. In South Australia, suburbs with this profile have historically clustered in the upper tercile of 10-year capital growth.
Strong rental coverage: $360/week (~$1,560/month) covers 90% of the $1,733/month median mortgage repayment, so the shortfall sits at just $173/month. Investors targeting positive cash flow should shortlist this suburb.
Only 32% 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 St Clair property
Scenario comparison, cash flow analysis, tax modelling, and PDF export — all in one place.
Create free account →St Clair enters 2026 with a demographic tailwind — household incomes 21% above the South Australia suburb median of $80,964 and a population of 2,634 give it the depth and purchasing power to outperform the wider SA market over the next 12–18 months. Rental coverage runs at ~90% of the typical mortgage ($1,560/month rent vs $1,733/month repayment), keeping cash flow in positive or near-neutral territory. The EquitySight investment score of 61/100 places St Clair in the upper-middle tier of Australian suburbs we profile, and overall investor sentiment is balanced heading into the second half of 2026.
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St Clair scores 61/100 on our EquitySight investment framework — a good rating. That score is driven by a population of 2,634, median household income of $98,280/year and median weekly rent of $360. 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 St Clair are proximity to Adelaide (9 km), an above-state-median household income of $98,280/year, a dwelling mix that is 32% 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.
St Clair has a usual resident population of approximately 2,634, 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.
St Clair sits 9 km straight-line from the Adelaide CBD. This is inner-ring territory — pricing competes directly with established Adelaide employment nodes.
The most recent census recorded a median weekly rent of $360 in St Clair, equating to approximately $18,720/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 St Clair is $1,733, or approximately $20,796/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 $360 works out to $1,560/month, covering 90% of the median mortgage repayment of $1,733/month. That leaves a $173/month shortfall (around $2,076/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 a thin buyer pool (2,634 residents), interest-rate sensitivity on the $1,733 median mortgage, a unit-heavy dwelling mix (32% 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.