O'Sullivan Beach SA

Postcode 5166 · Onkaparinga LGA

O'Sullivan Beach is a small community in South Australia within the Onkaparinga local government area (postcode 5166). With a population of 1,844, the suburb has an established demographic with a median age of 44. Households earn a median income of $56K per year, with an average household size of 2.2 people. The most common occupations are technicians & trades, community & personal service, labourers. The top ancestries reported are English, Australian, Scottish.

The median house price in O'Sullivan Beach is $788,000, having surged 22.1% over the past year. The median weekly rent is $300 (Census 2021). This gives a gross rental yield of approximately 2.0%. The median monthly mortgage repayment is $1,200.

O'Sullivan Beach is served by 2 schools, including 1 primary, 1 combined. The average ICSEA score is 1010, which is around the national average of 1,000. Public transport access includes 16 bus stops. The crime rate in the Onkaparinga LGA is moderate at 5,965 incidents per 100,000 population.

From an investment perspective, O'Sullivan Beach offers a gross rental yield of 2.0%, rated as low yield. Property prices are near the state median ($788K/$950K). The price-to-income ratio of 14.1x is considered stretched. House prices have moved +22.1% year-on-year.

INVESTMENT SIGNALS
Rental Yield2.0% Low Yield
Price vs State$788K/$950K Near Median
Affordability14.1x Stretched
Price Momentum+22.1% Rising
SEIFA INDEX (ABS)
Advantage1/10
Education1/10
Economic1/10
Disadvantage1/10
MEDIAN HOUSE
$788K
22.1% YoY
MEDIAN RENT /WK
$300
POPULATION
1,844
DEMOGRAPHICS
Median Age44
Household Size2.2
HH Income /wk$1,072
Personal Income /wk$599
Mortgage /mth$1,200
CRIME (Onkaparinga LGA)
Crime Rate (per 100k)5,965
Total Incidents110
TRANSPORT
Bus Stops16
SCHOOLS (2)
Avg ICSEA1010
Total Students314
Independent1
Government1
Southern Montessori SchoolCombined · Independent · ICSEA 1095
O'Sullivan Beach Primary SchoolPrimary · Government · ICSEA 926
Data: 2025-Q4