St Marys at a glance
Median house
$1,115,500
+21.9% year on year
Median unit
$257,760
Walk score
16
Very car dependent
Population
3,010
Median age 35
The brief
What to know about St Marys.
The postcode for St Marys is 5042 (SA), part of Greater Adelaide.
The median house price in St Marys is $1,115,500.
St Marys (5042) sits in the Marion region of South Australia. The median house here is $1,115,500, well above the South Australia median of around $720K. Prices have moved +21.9% over the past year, well clear of the South Australia average (5%).
St Marys has roughly 3,010 residents, with a typical family-age mix. Households are mostly owner-occupied. Daily life is car-dependent: most residents drive to work, school and the shops.
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Day to day
What it’s like to live here.
St Marys scores 16/100 on walkability, which makes it car-dependent with limited public transport. Plan for two cars in a typical household, especially if work isn't local.
Summer days here average around 28°C (warm), winter mornings around 7°C (cool). Annual rainfall lands at about 448mm. Data comes from the Bureau of Meteorology's Adelaide (Kent Town) station, 11.1km away.
Schooling within or near the suburb covers 9 government primary, 3 government secondary, 2 Catholic, 4 independent.
Who lives here
Demographics.
The 2021 Census put St Marys's population at 3,010, with a median age of 35. That sits as a typical family-age mix. Households are mostly owner-occupied (62% own, 36% rent), which shapes everything from school catchment stability to how often properties turn over. The household mix skews family-dominated (63% family households, 32% lone person), so amenity decisions tend to follow what families want: parks, schools, supermarkets.
Population
3,010
Median age
35
Family households
63%
Lone person
32%
Demographics data as of May 2026· ABS 2021 Census
Houses change hands at $1,115,500 on a typical sale, well above the South Australia median. Units come in around $257,760, roughly 77% below the house median. The last 12 months delivered strong growth (+21.9%) — well clear of the long-run average for the state.
For buyers
A 20% deposit on the median house works out to roughly $223,000. Prices sit well above the South Australia median, so plan for a stretched deposit and shop carefully on borrowing capacity.
For sellers
Twelve-month growth is +21.9%, supporting confident pricing at the upper end of recent comparables.
Market
The price of a home here.
Median house price
$1,115,500
+21.9% over the past year. Median unit price $257,760.
Sales data as of July 2026· sales-sa
Rental and ownership
Weekly rent (house)
$697/wk
Weekly rent (unit)
$470/wk
Owner occupied
62%
Renter occupied
36%
At a deeper level
$1,115,500
+21.9% annual growth
$257,760
3,010
Median age: 35
Rental data as of March 2026· rental-sa
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For investors
Investment overview.
Gross rental yield on houses sits at 3.25% (median rent $697/wk against a $1,115,500 price tag). Units yield 9.48% gross, often the better cash-flow play for first-time investors. With 36% of households renting, the leasing market is established and vacancy risk tends to be lower than in owner-dominated suburbs. The 12-month growth of +21.9% adds a capital-growth case on top of the yield.
Gross Yield (House)
Source: data.sa.gov.au · July 20263.25%
Based on $1,115,500 median
Gross Yield (Unit)
Source: data.sa.gov.au · July 20269.48%
Based on $257,760 median
Annual Growth (House)
Source: data.sa.gov.au · July 2026+21.9%
Year-on-year capital growth
Annual Growth (Unit)
Source: data.sa.gov.au · July 2026–
Year-on-year capital growth
Owner Occupancy
Source: ABS Census 2021 · May 202662%
Higher = more owner-occupier demand
Days on Market
Source: data.sa.gov.au · July 2026–
Lower = higher buyer demand
Gross rental yield is annual rent divided by purchase price, before expenses. It does not account for vacancy rates, management fees, maintenance, or financing costs. Use this as a starting point for further research.
5-year trajectory
at +21.9%/yr
2021
$414K
5-year change
+169%
2026
$1.1M
Trajectory derived from the current median compounded at the suburb’s annual growth rate, not raw sale-by-sale history.
Safety
Crime and safety.
253
total offences in 2025-26
Top offence categories
Crime statistics are reported at LGA level and may cover a broader area than this suburb.
Source: State Police Open Data
Crime data as of June 2026· State Police Open Data
Getting around
Walkability.
16
0
100
Scores calculated from OpenStreetMap data (ODbL)
Walkability data as of May 2026· OpenStreetMap
Place
Location.
Amenities
Transport
Education
Schools in St Marys.
Local schools for St Marys
View the catchment for each school to find out more.
Government School Catchment
Clovelly Park Primary School
Hamilton Secondary College
Springbank Secondary College
© ACARA, licensed under CC BY 4.0.
Climate
Weather year-round.
Annual Rainfall
448 mm
Hottest Month (avg max)
28.0°C
Coldest Month (avg min)
7.0°C
Monthly Rainfall (mm)
Weather data from BOM station Adelaide (Kent Town) (11 km away)
Climate data as of May 2026· Bureau of Meteorology
Frequently asked
About St Marys.
- What is the median house price in St Marys?
- The median house price in St Marys, SA 5042 is $1,115,500. The median unit price is $257,760. Annual growth is +21.9%.
- What is the St Marys postcode?
- St Marys is in the 5042 postcode, in SA, in the City of Marion region.
- Where is St Marys?
- St Marys is a suburb of Adelaide, in SA 5042. It is part of the Greater Adelaide area, in the City of Marion region.
- What is the average rent in St Marys?
- The median weekly rent for houses is $697, for units it's $470.
- What schools are in St Marys?
- There are 20 schools serving St Marys on this page, including St Bernadette's School, Clovelly Park Primary School, Hamilton Secondary College.
- How walkable is St Marys?
- St Marys has a Walk Score of 16 out of 100, highly car-dependent. transit score 0, bike score 100.
- What suburbs are near St Marys?
- St Marys is close to Flinders University, Clovelly Park, Tonsley, Pasadena, Mitchell Park.
- What is the population of St Marys?
- The population of St Marys is approximately 3,010 (2021 Census). The median age is 35.
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Sources cited
Median, growth and rental data from state revenue offices and ABS. Census from ABS 2021. Climate from BoM. Hazard from Geoscience Australia. School data from ACARA. Crime from state police open data. Full methodology →
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