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ABS 2021 Census · Updated 21 May 2026
Southern Brook is a regional centre in Western Australia, Australia, with a population of approximately 91, making it a boutique locality. Located approximately 102 km from the Perth CBD, Southern Brook is a regional area in Western Australia. The median household income is $97,448 per year.
Above-average earnings in Southern Brook support sustained property values. As a regional location, growth prospects depend on local economic conditions and infrastructure investment.
Official Australia Post postcode for Southern Brook. 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 Southern Brook 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.
Southern Brook is a smaller community of 91 — about 2% of the Western Australia suburb median (5,605) — so investors should factor in the narrower buyer pool and longer average time-on-market. At $97,448/year, household income in Southern Brook is within 2% of the Western Australia median ($99,736), placing the suburb firmly in the state's mainstream demographic band. Weekly rent of $150 covers just 34% of the median $1,900/month mortgage repayment, leaving a $1,250/month gap — investors should only pursue this suburb with a clear capital-growth thesis and sufficient external income to fund the shortfall. Southern Brook is 102 km from Perth, so the local market tracks regional employment and lifestyle drivers more than CBD-driven commuter demand.
How Southern Brook stacks up against the median of all Western Australia suburbs in our dataset. Positive values mean Southern Brook sits above the state median; negative means below.
| Metric | Southern Brook | WA median | Δ vs state |
|---|---|---|---|
| Population | 91 | 5,605 | -98% |
| Median household income | $97,448/yr | $99,736/yr | -2% |
| Median rent (weekly) | $150 | $350 | -57% |
| Median mortgage (monthly) | $1,900 | $1,902 | 0% |
| Distance to CBD | 102 km | 20 km | +410% |
| Separate houses | 74% | 79% | -5pp |
Pre-inspection briefing for Southern Brook — every item is derived from public datasets, with full citations in our data sources page.
Limited buy-and-hold upside: a small population of 91 means liquidity is thin and capital growth tends to lag the wider Western Australia market over full cycles.
Weak cash flow: $150/week rent covers only 34% of the $1,900/month median mortgage — a $1,250/month gap that must be funded from other income. This suburb is a capital-growth play, not a yield play.
With 74% houses in a 91-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 Southern Brook property
Scenario comparison, cash flow analysis, tax modelling, and PDF export — all in one place.
Create free account →Capital-growth expectations for Southern Brook are modest for 2026 — incomes close to the WA median of $99,736 and a population of 91 suggest gains will lag headline metro markets. Rental coverage runs at ~34% of the typical mortgage ($650/month rent vs $1,900/month repayment), meaning investors will rely on capital growth rather than yield. The EquitySight investment score of 41/100 places Southern Brook in the mid tier of Australian suburbs we profile, and overall investor sentiment is cautious heading into the second half of 2026.
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Southern Brook scores 41/100 on our EquitySight investment framework — a moderate rating. That score is driven by a population of 91, median household income of $97,448/year and median weekly rent of $150. 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 Southern Brook are a median household income of $97,448/year, a dwelling mix that is 74% 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.
Southern Brook has a usual resident population of approximately 91, compared with a Western Australia suburb median of 5,605 — 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.
Southern Brook sits 102 km straight-line from the Perth CBD. This is a regional market where CBD distance is only indicative — local industry diversity and commute alternatives matter more.
The most recent census recorded a median weekly rent of $150 in Southern Brook, equating to approximately $7,800/year in gross rental income (state median $350/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 Southern Brook is $1,900, or approximately $22,800/year (vs $1,902/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 $150 works out to $650/month, covering 34% of the median mortgage repayment of $1,900/month. That leaves a $1,250/month shortfall (around $15,000/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 (91 residents), interest-rate sensitivity on the $1,900 median mortgage, the broader Western 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.