St Marys SA

Postcode 5042 · Mitcham LGA

St Marys is a smaller suburb in South Australia within the Mitcham local government area (postcode 5042). With a population of 3,010, the suburb has a mix of young professionals and families with a median age of 35. Households earn a median income of $77K per year, with an average household size of 2.4 people. The most common occupations are professionals, community & personal service, technicians & trades. The top ancestries reported are English, Australian, Scottish.

The median house price in St Marys is $990,000, having surged 12.4% over the past year. The current median weekly rent is $550. This gives a gross rental yield of approximately 2.9%. The median monthly mortgage repayment is $1,654.

St Marys is served by 1 school, including 1 primary. The average ICSEA score is 1085, which is above the national average of 1,000. Public transport access includes 17 bus stops. The crime rate in the Mitcham LGA is moderate at 7,874 incidents per 100,000 population.

From an investment perspective, St Marys offers a gross rental yield of 2.9%, rated as low yield. Property prices are near the state median ($990K/$950K). The price-to-income ratio of 12.8x is considered stretched. House prices have moved +12.4% year-on-year.

INVESTMENT SIGNALS
Rental Yield2.9% Low Yield
Price vs State$990K/$950K Near Median
Affordability12.8x Stretched
Price Momentum+12.4% Rising
SEIFA INDEX (ABS)
Advantage5/10
Education8/10
Economic2/10
Disadvantage6/10
MEDIAN HOUSE
$990K
12.4% YoY
MEDIAN RENT /WK
$285
POPULATION
3,010
DEMOGRAPHICS
Median Age35
Household Size2.4
HH Income /wk$1,490
Personal Income /wk$785
Mortgage /mth$1,654
CRIME (Mitcham LGA)
Crime Rate (per 100k)7,874
Total Incidents237
TRANSPORT
Bus Stops17
SCHOOLS (1)
Avg ICSEA1085
Total Students205
Catholic1
St Bernadette's SchoolPrimary · Catholic · ICSEA 1085
Data: 2025-Q4