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ABS 2021 Census · Updated 21 May 2026
Thomas Plain is a regional centre in South Australia, Australia, with a population of approximately 46, making it a boutique locality. Located approximately 126 km from the Adelaide CBD, Thomas Plain is a regional area in South Australia. The median household income is $123,448 per year.
Above-average earnings in Thomas Plain support sustained property values. As a regional location, growth prospects depend on local economic conditions and infrastructure investment.
Official Australia Post postcode for Thomas Plain. 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 Thomas Plain 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.
Thomas Plain is a smaller community of 46 — about 1% 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 $123,448/year runs 52% 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. The median weekly rent of $100 translates to approximately $5,200/year in gross rental income, setting the upper bound on yield before vacancy, rates, insurance and maintenance. Thomas Plain is 126 km from Adelaide, so the local market tracks regional employment and lifestyle drivers more than CBD-driven commuter demand. Separate houses make up 94% of dwellings — 21 percentage points above the South Australia median of 73% — pointing to a family-oriented, land-rich market where value is concentrated in the underlying block.
How Thomas Plain stacks up against the median of all South Australia suburbs in our dataset. Positive values mean Thomas Plain sits above the state median; negative means below.
| Metric | Thomas Plain | SA median | Δ vs state |
|---|---|---|---|
| Population | 46 | 3,699 | -99% |
| Median household income | $123,448/yr | $80,964/yr | +52% |
| Median rent (weekly) | $100 | $320 | -69% |
| Distance to CBD | 126 km | 13 km | +869% |
| Separate houses | 94% | 73% | +21pp |
Pre-inspection briefing for Thomas Plain — every item is derived from public datasets, with full citations in our data sources page.
Limited buy-and-hold upside: a small population of 46 means liquidity is thin and capital growth tends to lag the wider South Australia market over full cycles.
Gross rent of $100/week (~$5,200/year) sets the yield ceiling. Cross-check against your purchase price to confirm whether this suburb hits the 4–5% gross yield most Australian investors target.
With 94% houses in a 46-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 Thomas Plain property
Scenario comparison, cash flow analysis, tax modelling, and PDF export — all in one place.
Create free account →Capital-growth expectations for Thomas Plain are modest for 2026 — incomes 52% above the SA median of $80,964 and a population of 46 suggest gains will lag headline metro markets. Rents sit around $100/week, setting the baseline gross rental income at roughly $5,200/year — refine this against current listings before running your numbers. The EquitySight investment score of 46/100 places Thomas Plain 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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Thomas Plain scores 46/100 on our EquitySight investment framework — a moderate rating. That score is driven by a population of 46, median household income of $123,448/year and median weekly rent of $100. 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 Thomas Plain are an above-state-median household income of $123,448/year, a dwelling mix that is 94% 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.
Thomas Plain has a usual resident population of approximately 46, 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.
Thomas Plain sits 126 km straight-line from the Adelaide 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 $100 in Thomas Plain, equating to approximately $5,200/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.
A reliable median mortgage figure was not captured for Thomas Plain. Use our loan serviceability calculator to estimate a realistic monthly repayment for your target purchase price and deposit.
Census data was not complete enough in Thomas Plain to compute a clean rent-to-mortgage coverage. Use current listings to benchmark weekly rent, then plug your expected purchase price into our rental yield calculator to see whether the investment runs cash-flow positive or negative.
The main risks are a thin buyer pool (46 residents), interest-rate sensitivity, 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.