Suburb overview
St Agnes is a well-established middle-ring suburb of Adelaide, Australia, with a population of approximately 4,233, making it a boutique locality. Located approximately 15 km from the Adelaide CBD, St Agnes is a middle ring area in South Australia. The median household income is $80,964 per year.
Location
Key indicators
Postcode
5097
Postcode for St Agnes, from a community postcode dataset cross-checked against Australia Post. A postcode may cover multiple suburbs.
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Population
4,233
Usual resident population at the most recent census.
Median weekly rent
$610/wk
Median weekly rent — as at Jan–Mar 2026, Consumer & Business Services (SA) (CC BY 4.0).
Distance to CBD
15 km
Straight-line distance from the suburb centroid to the nearest capital city CBD. Actual driving distance will be longer.
Sale prices & yield
Median house price
$845,000
Median house sale price — as at Q1 2026, Valuer-General (SA) (CC BY 4.0). Figure covers suburb (metro Adelaide).
Indicative gross yield
3.8%
Estimated as current median rent × 52 ÷ current median house price. A guide only — not a guaranteed return; excludes costs, vacancy and buying expenses.
Housing
Median monthly mortgage
$1,500/mo
Monthly median mortgage repayment for households currently paying off a mortgage.
Home type
82% houses
Proportion of separate houses versus units, townhouses, and other home types. Useful for investors assessing rental demand mix.
Why people like living in St Agnes
- Middle-ring location about 15 km from Adelaide — balance of commute and affordability.
- Predominantly separate houses (82%) — suburban lifestyle with more land.
- Established streets, local shops, and schools within the neighbourhood.
Who St Agnes suits
Pros and cons
Pros
- Rent sits within an affordable share of local incomes, supporting tenant demand.
- Mortgage costs are lower than the South Australia median, improving cash-flow margins.
- Established middle-ring position between the CBD and the urban fringe.
Cons
- Traffic can build during peak hours, especially on arterial roads.
- Prices may rise further as demand continues.
Investment insight
4,233 residents places St Agnes squarely in the middle of the South Australia suburb size distribution (state median 3,699), with market depth comparable to most SA localities. At $80,964/year, household income in St Agnes is within 0% of the South Australia median ($80,964), placing the suburb firmly in the state's mainstream demographic band. Median rent of $610/week (as at Jan–Mar 2026, Consumer & Business Services (SA)) equates to roughly $2,643/month — about 176% of the $1,500/month median mortgage repayment recorded at the 2021 Census. On those figures rental income covers most or all of the recorded repayment, but repayments on new loans have risen with interest rates since 2021, so re-run the coverage at today's rates before treating this as a cash-flow suburb. 15 km from Adelaide places St Agnes in the middle commuter belt, close enough for daily trips by car or rail but at a materially lower price point than inner suburbs.
Investment tip
This suburb suits long-term investors looking for a balance of rental yield and capital growth. Schools and transport underpin family demand. At the 2021 Census, local rents consumed roughly 22% of household income — a dated but useful sanity check on tenant affordability.
St Agnes vs South Australia median
How St Agnes stacks up against the median of all South Australia suburbs in our dataset. Positive values mean St Agnes sits above the state median; negative means below.
| Metric | St Agnes | SA median | Δ vs state |
|---|---|---|---|
| Population | 4,233 | 3,699 | +14% |
| Median household income | $80,964/yr | $80,964/yr | 0% |
| Median rent (weekly, 2021 Census) | $340 | $320 | +6% |
| Median mortgage (monthly, 2021 Census) | $1,500 | $1,616 | -7% |
| Distance to CBD | 15 km | 13 km | +15% |
| Separate houses | 82% | 73% | +9pp |
Investor checklist
Pre-inspection briefing for St Agnes — every item is derived from public datasets, with full citations in our data sources page.
- Market depth: 4,233 residents — 114% of the SA suburb median (3,699).
- Purchasing power: median household income $80,964/year (+0% vs South Australia suburb median of $80,964).
- Cash-flow coverage (2021 Census): $340/week rent (≈ $1,473/month) covered ~98% of the $1,500/month median mortgage at the 2021 Census — verify against current rents and rates.
- CBD access: 15 km straight-line from Adelaide (state suburb median 13 km).
- Dwelling mix: 82% separate houses — house-dominant market (vs 73% state median).
- Rate stress-test: budget ~$150/month extra for a 1-percentage-point RBA rate rise on top of the $1,500/month median repayment.
- Tenant rent burden: 22% of the median household income is spent on rent — comfortably affordable.
Investment strategy
Moderate buy-and-hold potential: St Agnes's 4,233-person market and $80,964 median household income work for investors who are selective on street location and property quality rather than counting on a suburb-wide rerating.
Strong rental coverage at the 2021 Census: $340/week (~$1,473/month) covered 98% of the $1,500/month median mortgage, a shortfall of just $27/month. Both rents and repayments have moved since 2021 — verify current figures, though this suburb has historically leaned cash-flow-friendly.
With 82% houses in a 4,233-person market, renovation margins depend on individual street and aspect rather than any suburb-wide story — do comparable-sales analysis before committing capital.
Risk factors
- Interest-rate sensitivity: the $1,500/month median mortgage in St Agnes means a 1-percentage-point RBA rate rise could add roughly $150/month to repayments, reducing buyer borrowing capacity and cooling prices.
- Liquidity risk: with 4,233 residents, St Agnes has a thinner pool of buyers and tenants than larger suburbs. Expect longer days-on-market on resale and budget for potential vacancy gaps between tenancies.
- Regulatory risk: changes to Australian tax settings (negative gearing, CGT discount, foreign-buyer surcharges, land-tax thresholds) could reshape after-tax returns in St Agnes regardless of local market conditions.
- Market cycle risk: property markets are cyclical, so stress-test your projections in St Agnes with a 10–15% price pullback scenario before committing capital — returns to date are not a guarantee of future performance.
Run the numbers on a St Agnes property
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Start your journey near St Agnes →2026 outlook
Capital-growth expectations for St Agnes are modest for 2026 — incomes close to the SA median of $80,964 and a population of 4,233 suggest gains will lag headline metro markets. At the 2021 Census, rental coverage ran at ~98% of the typical mortgage ($1,473/month rent vs $1,500/month repayment), keeping cash flow in positive or near-neutral territory. Verify against current rents and rates. Overall investor sentiment for St Agnes is balanced heading into the second half of 2026, based on its income, rent and mortgage profile relative to the South Australia median.
Frequently asked questions
Is St Agnes a good suburb for investment?
Whether St Agnes suits you depends on your strategy, but the fundamentals are concrete: a population of 4,233, a median household income of $80,964/year and median weekly rent of $340. Weigh those against your goal — cash flow, capital growth, or a value-add renovation — each of which we break down with suburb-specific ABS numbers elsewhere on this page.
What drives property demand in St Agnes?
The main demand drivers in St Agnes are proximity to Adelaide (15 km), an above-state-median household income of $80,964/year, a dwelling mix that is 82% separate houses. Together these shape both owner-occupier and tenant demand.
What is the population of St Agnes?
St Agnes has a usual resident population of approximately 4,233, compared with a South Australia suburb median of 3,699 — 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.
How far is St Agnes from the Adelaide CBD?
St Agnes sits 15 km straight-line from the Adelaide CBD. This is comfortable commuter territory, with reasonable rail and road access to the city.
What is the median rent in St Agnes?
The median weekly rent in St Agnes is $610 (as at Jan–Mar 2026, Consumer & Business Services (SA)), equating to approximately $31,720/year in gross rental income. Confirm against current listings on realestate.com.au and Domain before making an offer.
What is the typical mortgage repayment in St Agnes?
The median monthly mortgage repayment in St Agnes is $1,500, or approximately $18,000/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.
Is St Agnes cash-flow positive for investors?
A median weekly rent of $340 works out to $1,473/month, covering 98% of the median mortgage repayment of $1,500/month. That leaves a $27/month shortfall (around $324/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.
What are the main risks of investing in St Agnes?
The main risks are a thin buyer pool (4,233 residents), interest-rate sensitivity on the $1,500 median mortgage, 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.
How we built this St Agnes profile
The population figure on this page comes from the ABS 2021 Census. The postcode comes from a community postcode dataset cross-checked against Australia Post. The dwelling mix is from the ABS 2021 Census. The median household income is the ABS 2021 Census median weekly household income, annualised. Distance to the CBD is calculated from the suburb's ABS centroid. The Census median rent and mortgage figures are 2021 figures and are labelled as such wherever they appear — they are five years old and have moved substantially since. The current median weekly rent in Key indicators is a genuine recent figure from Consumer & Business Services (SA) (Jan–Mar 2026), published under a Creative Commons licence and dated on the page. The median sale price shown comes from Valuer-General (SA) (Q1 2026), published under a Creative Commons licence and dated on the page. We do not publish an investment score or school/park counts for this suburb. See our methodology and data sources for exactly what's measured and what's estimated.