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ABS 2021 Census · Updated 21 May 2026
Semaphore Park is a well-established middle-ring suburb of Adelaide, Australia, with a population of approximately 4,541, making it a boutique locality. Located approximately 13 km from the Adelaide CBD, Semaphore Park is a middle ring area in South Australia. The median household income is $65,624 per year.
Lower income levels in Semaphore Park typically translate to more affordable entry points for investors. Close CBD access strengthens tenant appeal and resale value.
Official Australia Post postcode for Semaphore Park. 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 Semaphore Park on My School →Estimated 2 parks 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.
Semaphore Park's population of 4,541 sits 23% above the South Australia suburb median of 3,699, giving it a wider tenant and buyer catchment than the average SA locality. Household income of $65,624/year is 19% below the South Australia median of $80,964, typically translating into lower entry prices and a tenant base more sensitive to rent increases. Median rent of $250/week (~$1,083/month) covers only 61% of the median mortgage of $1,786/month — the remaining $703/month must be funded from other income, so this suburb tilts toward capital growth rather than yield. 13 km from Adelaide places Semaphore Park in the middle commuter belt, close enough for daily trips by car or rail but at a materially lower price point than inner suburbs. Only 49% 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 20% of household income — a useful sanity check on tenant affordability.
How Semaphore Park stacks up against the median of all South Australia suburbs in our dataset. Positive values mean Semaphore Park sits above the state median; negative means below.
| Metric | Semaphore Park | SA median | Δ vs state |
|---|---|---|---|
| Population | 4,541 | 3,699 | +23% |
| Median household income | $65,624/yr | $80,964/yr | -19% |
| Median rent (weekly) | $250 | $320 | -22% |
| Median mortgage (monthly) | $1,786 | $1,616 | +11% |
| Distance to CBD | 13 km | 13 km | 0% |
| Separate houses | 49% | 73% | -24pp |
Pre-inspection briefing for Semaphore Park — every item is derived from public datasets, with full citations in our data sources page.
Moderate buy-and-hold potential: Semaphore Park's 4,541-person market and $65,624 median household income work for investors who are selective on street location and property quality rather than counting on a suburb-wide rerating.
Weak cash flow: $250/week rent covers only 61% of the $1,786/month median mortgage — a $703/month gap that must be funded from other income. This suburb is a capital-growth play, not a yield play.
Only 49% 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 Semaphore Park property
Scenario comparison, cash flow analysis, tax modelling, and PDF export — all in one place.
Create free account →Capital-growth expectations for Semaphore Park are modest for 2026 — incomes 19% below the SA median of $80,964 and a population of 4,541 suggest gains will lag headline metro markets. Rental coverage runs at ~61% of the typical mortgage ($1,083/month rent vs $1,786/month repayment), leaving a manageable top-up for most investors. The EquitySight investment score of 57/100 places Semaphore Park in the mid tier of Australian suburbs we profile, and overall investor sentiment is balanced heading into the second half of 2026.
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Semaphore Park scores 57/100 on our EquitySight investment framework — a moderate rating. That score is driven by a population of 4,541, median household income of $65,624/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 Semaphore Park are proximity to Adelaide (13 km), a median household income of $65,624/year, a dwelling mix that is 49% separate houses, roughly 1 schools and 2 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.
Semaphore Park has a usual resident population of approximately 4,541, 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.
Semaphore Park sits 13 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 Semaphore Park, 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 Semaphore Park is $1,786, or approximately $21,432/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 61% of the median mortgage repayment of $1,786/month. That leaves a $703/month shortfall (around $8,436/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 (4,541 residents), interest-rate sensitivity on the $1,786 median mortgage, below-median household incomes ($65,624 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.