Port Augusta (postcode 5700) sits at the head of Spencer Gulf, roughly 310 kilometres north of Adelaide, and serves as the primary service and logistics hub for outback South Australia. Its SEIFA IRSAD score of 862 places it in decile 1 of 10 nationally and at the 6th percentile within South Australia, making it one of the most socioeconomically disadvantaged postcodes in the state. That reading reflects a combination of below-average household incomes, elevated unemployment relative to the state average, and a demographic profile that includes a significant proportion of residents relying on government services. Investors considering this postcode need to understand what that signal means for the model before evaluating any specific listing.
ABS 2021 IRSAD release. Score 862 (national mean = 1000).
PropertyRanker uses the SEIFA IRSAD score as a primary input for three of its twelve scoring criteria: economic_strength, hazard_risk, and entry_point_risk. A raw score of 862 against a national mean of 1000 is a material gap. On economic_strength, it signals a local income base that is structurally weaker than most Australian postcodes, which constrains the pool of tenants who can sustain rent increases and limits the depth of owner-occupier demand that typically underpins capital growth. On entry_point_risk, a low SEIFA reading is associated with thinner liquidity and wider bid-ask spreads in downturns, meaning exit timing matters more than in higher-decile markets. On hazard_risk, the model treats deep socioeconomic disadvantage as a proxy for elevated exposure to economic shocks, including industry closures. Port Augusta experienced exactly that dynamic when its coal-fired power stations shut down, and the local economy has been working through a transition toward solar energy, agriculture, and regional services since then. The city does carry genuine structural advantages: it is the crossroads of major road and rail corridors connecting Adelaide to Darwin, Perth, and Sydney, and it provides essential services to a vast surrounding region. Those factors support a baseline level of rental demand from workers, government employees, and transient populations. However, the SEIFA reading sits on the macro side of the model. It cannot see the specific street, the build quality, the strata health, or the orientation of a given property. A listing inside this postcode can score well or poorly depending on those micro-level factors. The SEIFA reading alone does not make Port Augusta a pass. It does mean the due-diligence bar is higher than in a decile 5 or decile 8 suburb. Given the yield profile typical of deeply discounted regional markets, the strategy alignment most consistent with this postcode is High Yield (targeting around 6 percent gross) or Regional (targeting around 7 percent gross), rather than Capital Growth (around 3.5 percent), which requires a stronger underlying demand dynamic to justify compressed yields.
Port Augusta SA 5700 is recording strong house price growth, with YIP (CoreLogic data to May 2026) reporting a median of $318,000 and annual capital growth of 24.1%, supported by 125 house sales over the prior 12 months. Propradar (August 2026) similarly records a median of $320,000 and growth of 21.8%, with a tight rental vacancy of 1.5%. Vendor discounting of -5.3% and days on market of 38-75 days (sources vary) point to a market that is active but where buyers retain some negotiating room.
Vacancy at 1.5% is tight and tightening, DOM signals are mixed across sources (38-75 days), and vendor discounting of -5.3% indicates buyers still extracting concessions, netting a warming overall read.
Sources: Port Augusta SA 5700 Suburb Profile - Your Investment Property Mag (CoreLogic) (2026-08-20); Port Augusta SA 5700 - Propradar (2026-08-07); Port Augusta House Prices & Property Trends - PropertyValue (Cotality); PORT AUGUSTA SA Median House Price $328,291 - Andrea Monti Buyer's Agent (2026-08-01) · Refreshed 24 Sep 2026
PropertyRanker scores any Australian property against 12 criteria across three pillars: Growth, Cashflow, and Risk. SEIFA is a primary signal for economic strength and a supporting one for entry-price risk. It also informs the crime side of hazard risk, though physical overlays like flood, bushfire and coastal exposure, and recorded crime data where available, take priority there. The decile of 1 shown above gives a listing in Port Augusta a softer starting line on economic strength, though often a firmer one on entry-price risk, since less advantaged postcodes usually carry lower entry prices.
On top of that, PropertyRanker chooses one of four strategies (Balanced, Growth, Yield, Regional) and applies a per-strategy yield anchor. The anchors are 3.5% for Growth, 5% for Balanced, 6% for Yield, and 7% for Regional. A postcode at this level tends to make the Yield (6% anchor) and Regional (7% anchor) strategies more reachable, because a lower entry price lifts the gross yield a listing can achieve, while a Growth result usually depends on a specific catalyst such as an infrastructure or renewal pipeline.
Read the scoring guide for the full criteria list and how the verdict thresholds work.
Before treating the SEIFA reading as a verdict on any specific listing, investors should check the following. First, confirm current SQM vacancy data for postcode 5700: regional markets with thin tenant pools can swing from low to high vacancy quickly, and the SEIFA score cannot capture that in real time. Second, if the property is strata or community title, obtain the body corporate financials and minutes; deferred maintenance in a low-income postcode is a common risk that a suburb-level score cannot detect. Third, check flood and overlay status with the City of Port Augusta and the SA Planning Portal, particularly for properties near the Spencer Gulf foreshore or low-lying areas. Fourth, compare the asking price against recent comparable sales in the same street or precinct rather than suburb-wide medians, which can mask wide internal variation. Finally, run the specific listing through PropertyRanker to receive a full twelve-criteria score that accounts for what this postcode-level SEIFA reading cannot see, including live vacancy, body corporate health, overlay status, and pricing against recent comparable sales.
The data presents a mixed picture that depends heavily on strategy and specific asset selection. Port Augusta's SEIFA IRSAD score of 862 (decile 1 nationally, 6th percentile in South Australia) signals genuine socioeconomic disadvantage, which the PropertyRanker model treats as a headwind for economic_strength and entry_point_risk. At the same time, the city's role as a regional service hub and transport crossroads supports a baseline of rental demand. Whether a specific listing here is worth pursuing depends on the micro-level factors that a postcode score cannot see, so scoring the individual property in PropertyRanker is the necessary next step.
Given the SEIFA decile 1 reading and the discounted price points typical of deeply disadvantaged regional markets, the High Yield strategy (targeting around 6 percent gross) or the Regional strategy (targeting around 7 percent gross) are the most consistent fits. Capital Growth strategy, which anchors around 3.5 percent gross yield, generally requires stronger underlying owner-occupier demand and income growth than Port Augusta's current SEIFA profile supports. Investors should verify the actual gross yield on any specific listing rather than assuming the suburb-wide tendency applies to their target property.
The primary macro risk flagged by the SEIFA score is economic fragility: a raw score of 862 against a national mean of 1000 reflects a local income base that is structurally weaker than most Australian postcodes, which constrains rent growth and owner-occupier demand. Port Augusta also experienced a significant economic shock when its coal-fired power stations closed, and the transition to new industries is ongoing. At the property level, the risks that a SEIFA score cannot see include vacancy spikes in thin rental markets, deferred maintenance in older housing stock, flood or coastal overlay exposure near Spencer Gulf, and illiquidity risk if exit timing coincides with a local downturn.
PropertyRanker runs twelve scoring criteria across macro and micro signals. The SEIFA IRSAD reading of 862 (decile 1) feeds directly into three of those criteria: economic_strength, hazard_risk, and entry_point_risk, all of which will score on the weaker end of the scale for this postcode. The remaining nine criteria assess factors the postcode-level SEIFA cannot see, including current SQM vacancy for 5700, body corporate health if applicable, flood and planning overlay status, and how the asking price compares to recent comparable sales. The final score reflects all twelve signals together, not the SEIFA reading in isolation.
A SEIFA decile 1 reading is a serious flag that warrants careful analysis, but it is one of twelve signals in the PropertyRanker model and does not by itself determine whether a specific listing is a sound investment. A property on a well-maintained street with strong rental demand, a healthy body corporate, no flood overlay, and a price well below comparable sales could score acceptably even inside a disadvantaged postcode. Conversely, a listing in a higher-SEIFA suburb can score poorly if the micro-level factors are unfavourable. The honest answer is that the SEIFA reading raises the due-diligence bar; it does not lower the gate entirely.
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