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ABS 2021 Census · Updated 21 May 2026
Millbrook is a regional centre in South Australia, Australia, with a population of approximately 133, making it a boutique locality. Located approximately 22 km from the Adelaide CBD, Millbrook is a regional area in South Australia. The median household income is $53,612 per year.
Household earnings in Millbrook are below the state average, which may affect long-term capital growth. Regional positioning means lower entry costs but potentially longer hold periods for capital gains.
Official Australia Post postcode for Millbrook. 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 Millbrook 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.
Millbrook is a smaller community of 133 — about 4% of the South Australia suburb median (3,699) — so investors should factor in the narrower buyer pool and longer average time-on-market. Millbrook's median household income of $53,612/year is 34% 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. Weekly rent of $250 covers just 43% of the median $2,492/month mortgage repayment, leaving a $1,409/month gap — investors should only pursue this suburb with a clear capital-growth thesis and sufficient external income to fund the shortfall. 22 km from Adelaide places Millbrook in the middle commuter belt, close enough for daily trips by car or rail but at a materially lower price point than inner suburbs.
How Millbrook stacks up against the median of all South Australia suburbs in our dataset. Positive values mean Millbrook sits above the state median; negative means below.
| Metric | Millbrook | SA median | Δ vs state |
|---|---|---|---|
| Population | 133 | 3,699 | -96% |
| Median household income | $53,612/yr | $80,964/yr | -34% |
| Median rent (weekly) | $250 | $320 | -22% |
| Median mortgage (monthly) | $2,492 | $1,616 | +54% |
| Distance to CBD | 22 km | 13 km | +69% |
| Separate houses | 59% | 73% | -14pp |
Pre-inspection briefing for Millbrook — every item is derived from public datasets, with full citations in our data sources page.
Limited buy-and-hold upside: a small population of 133 means liquidity is thin and capital growth tends to lag the wider South Australia market over full cycles.
Weak cash flow: $250/week rent covers only 43% of the $2,492/month median mortgage — a $1,409/month gap that must be funded from other income. This suburb is a capital-growth play, not a yield play.
Only 59% 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 Millbrook property
Scenario comparison, cash flow analysis, tax modelling, and PDF export — all in one place.
Create free account →Capital-growth expectations for Millbrook are modest for 2026 — incomes 34% below the SA median of $80,964 and a population of 133 suggest gains will lag headline metro markets. Rental coverage runs at ~43% of the typical mortgage ($1,083/month rent vs $2,492/month repayment), meaning investors will rely on capital growth rather than yield. The EquitySight investment score of 34/100 places Millbrook 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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Millbrook scores 34/100 on our EquitySight investment framework — a weak rating. That score is driven by a population of 133, median household income of $53,612/year and median weekly rent of $250. 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 Millbrook are proximity to Adelaide (22 km), a median household income of $53,612/year, a dwelling mix that is 59% 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.
Millbrook has a usual resident population of approximately 133, 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.
Millbrook sits 22 km straight-line from the Adelaide 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 $250 in Millbrook, equating to approximately $13,000/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 Millbrook is $2,492, or approximately $29,904/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 $250 works out to $1,083/month, covering 43% of the median mortgage repayment of $2,492/month. That leaves a $1,409/month shortfall (around $16,908/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 a thin buyer pool (133 residents), interest-rate sensitivity on the $2,492 median mortgage, below-median household incomes ($53,612 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.