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ABS 2021 Census · Updated 21 May 2026
Costello is a regional centre in Northern Territory, Australia, with a population of approximately 23, making it a boutique locality. Located approximately 1140 km from the Darwin CBD, Costello is a regional area in Northern Territory. The median household income is $142,948 per year.
Above-average earnings in Costello support sustained property values. Distance from major centres is a consideration, though regional markets can offer higher rental yields.
Official Australia Post postcode for Costello. 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 Costello 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.
Costello is a smaller community of 23 — about 1% of the Northern Territory suburb median (3,057) — so investors should factor in the narrower buyer pool and longer average time-on-market. Median household income of $142,948/year runs 26% above the Northern Territory suburb median of $113,308, indicating strong purchasing power and the type of demographic profile that tends to sustain premium property prices through market cycles. Costello is 1140 km from Darwin, so the local market tracks regional employment and lifestyle drivers more than CBD-driven commuter demand.
How Costello stacks up against the median of all Northern Territory suburbs in our dataset. Positive values mean Costello sits above the state median; negative means below.
| Metric | Costello | NT median | Δ vs state |
|---|---|---|---|
| Population | 23 | 3,057 | -99% |
| Median household income | $142,948/yr | $113,308/yr | +26% |
| Distance to CBD | 1140 km | 15 km | +7500% |
Pre-inspection briefing for Costello — every item is derived from public datasets, with full citations in our data sources page.
Limited buy-and-hold upside: a small population of 23 means liquidity is thin and capital growth tends to lag the wider Northern Territory market over full cycles.
Median rental data was not captured for Costello. Use current realestate.com.au and Domain listings to triangulate a realistic weekly rent before committing, then feed that number into our rental yield calculator.
With a population of 23, the resale market in Costello may not reliably reward cosmetic renovations — a longer hold is typically a better strategy at this scale, letting land-value appreciation do the work instead.
Run the numbers on a Costello property
Scenario comparison, cash flow analysis, tax modelling, and PDF export — all in one place.
Create free account →Capital-growth expectations for Costello are modest for 2026 — incomes 26% above the NT median of $113,308 and a population of 23 suggest gains will lag headline metro markets. Rental fundamentals will need to be verified against live listings, as a clean median rent was not recorded for Costello. The EquitySight investment score of 50/100 places Costello 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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Costello scores 50/100 on our EquitySight investment framework — a moderate rating. That score is driven by a population of 23, median household income of $142,948/year. 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 Costello are an above-state-median household income of $142,948/year, 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.
Costello has a usual resident population of approximately 23, compared with a Northern Territory suburb median of 3,057 — 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.
Costello sits 1140 km straight-line from the Darwin CBD. This is a regional market where CBD distance is only indicative — local industry diversity and commute alternatives matter more.
A reliable median rent was not captured for Costello. Benchmark expected weekly rent on realestate.com.au and Domain, or the state rental tribunal's rent dashboard. Most Australian investors target a 4–5% gross yield as a baseline.
A reliable median mortgage figure was not captured for Costello. 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 Costello 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 (23 residents), interest-rate sensitivity, the broader Northern Territory 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.