ABS 2021 Census · Updated 31 March 2026
St Marys is a well-established middle-ring suburb of Adelaide, Australia, with a population of approximately 3,010, making it a boutique locality. Located approximately 9 km from the Adelaide CBD, St Marys is a middle ring area in South Australia. The median household income is $77,480 AUD per year (ABS 2021 Census).
Moderate income levels in St Marys indicate steady rental demand from working households. Close CBD access strengthens tenant appeal and resale value.
Map shows St Marys, South Australia, Australia.
Official Australia Post postcode for St Marys. A postcode may cover multiple suburbs.
Australia Post Postcode Finder →Usual resident population at census night. Source: ABS 2021 Census of Population and Housing.
ABS Census Data →Weekly median rent for occupied private dwellings. Source: ABS 2021 Census. Live rental data integration coming soon.
State Rental Authority →Annual median household income (before tax) for all households. Source: ABS 2021 Census.
ABS Census Data →Straight-line distance from the suburb centroid (ABS 2021 SAL geography) to the nearest capital city CBD. Actual driving distance will be longer.
Estimated 1 school within or near this suburb based on ABS 2021 data.
Find schools near St Marys on My School →Estimated 1 park and green spaces near this suburb. Source: ABS 2021 data.
Monthly median mortgage repayment for households currently paying off a mortgage. Source: ABS 2021 Census.
ABS Census Data →Proportion of separate houses vs units, townhouses, and other dwelling types. Source: ABS 2021 Census. Relevant for investors assessing rental demand mix.
ABS Census Data →St Marys's middle-ring location balances affordability with accessibility. These suburbs often benefit from established infrastructure, good schools, and transport links — making them attractive to families and long-term tenants. The median rent of $285/week (ABS 2021) indicates an affordable rental market. Owner-occupiers face a median mortgage repayment of $1,654/month. The median household income of $77,480/year reflects a solid demographic, supporting sustainable rental demand.
A buy-and-hold approach in St Marys could work well with careful property selection and a longer time horizon.
St Marys's rental market is softer — budget for potential vacancy periods.
Renovation or flip strategies in St Marys face headwinds from a smaller buyer pool and slower turnover.
Run the numbers on a St Marys property
Scenario comparison, cash flow analysis, tax modelling, and PDF export — all in one place.
Create free account →Growth in St Marys through 2026 will likely be steady rather than spectacular, tracking the wider market. Rental demand is expected to be stable, though landlords may need to remain competitive on pricing. St Marys offers measured appeal for investors willing to look beyond headline metrics.
St Marys is a middle ring area in South Australia with a population of 3,010. The median rent is $285/week and the median household income is $77,480/year (ABS 2021 Census). As with any property investment, conduct thorough due diligence on current listings, vacancy rates, and local infrastructure plans before committing.
Key demand drivers in St Marys include established amenities and transport access. 63% of dwellings are separate houses. The area has approximately 1 schools and 1 parks nearby.
According to the ABS 2021 Census, St Marys has a population of approximately 3,010. For historical population trends and intercensal estimates, visit the ABS Census Data Explorer at abs.gov.au.
St Marys is approximately 9 km straight-line distance from the Adelaide CBD (calculated from ABS 2021 suburb centroid coordinates). This close proximity means excellent access to employment, dining, and entertainment.