O'Sullivan Beach at a glance
Median house
$820,000
+13.4% over 12 months
Median unit
$190,080
Population
1,844
Median age 44
Walk score
8
Very car dependent
Prices: Median of 9 house sales · SA Government · the latest published quarter (updated October 2026) · Population: 2021 Census
Houses change hands at $820,000 on a typical sale, in line with the South Australia median (9 house sales, SA Government quarterly medians, the latest published quarter (updated October 2026)). Units come in around $190,080, roughly 77% below the house median. The last 12 months delivered strong growth (+13.4%) — well clear of the long-run average for the state.
For buyers
A 20% deposit on the median house works out to roughly $164,000. Prices are in line with the South Australia median, so the broader state lending settings apply.
For sellers
Twelve-month growth is +13.4%, supporting confident pricing at the upper end of recent comparables.
Market
House prices in O'Sullivan Beach.
Median house price
$820,000
+13.4% over the past year. Median unit price $190,080.
Median of 9 house sales · SA Government · the latest published quarter (updated October 2026)
Rental and ownership
Weekly rent (house)
–
Weekly rent (unit)
–
Owner occupied
68%
Renter occupied
29%
At a deeper level
$820,000
+13.4% annual growth
$190,080
1,844
Median age: 44
Rental data as of October 2026
5-year trajectory
at +13.4%/yr
2021
$437K
5-year change
+88%
2026
$820K
Trajectory derived from the current median compounded at the suburb’s annual growth rate, not raw sale-by-sale history.
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The brief
What to know about O'Sullivan Beach.
O'Sullivan Beach's median house price is $820,000 (The SA Government's quarterly suburb median from 9 house sales, the latest published quarter (updated October 2026)).
Postcode 5166 (SA), City of Onkaparinga, part of Greater Adelaide.
O'Sullivan Beach (5166) sits in the Onkaparinga region of South Australia. The median house here is $820,000, in line with the South Australia median of around $720K. Prices have moved +13.4% over the past year, well clear of the South Australia average (5%).
O'Sullivan Beach has roughly 1,844 residents, with an established, older skew. Households are mostly owner-occupied. Daily life is car-dependent: most residents drive to work, school and the shops.
Side by side
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Day to day
What it’s like to live here.
O'Sullivan Beach scores 8/100 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 13 government primary, 1 government secondary, 4 Catholic, 2 independent.
Who lives here
Demographics.
The 2021 Census put O'Sullivan Beach's population at 1,844, with a median age of 44. That sits as an established, older skew. Households are mostly owner-occupied (68% own, 29% rent), which shapes everything from school catchment stability to how often properties turn over. The household mix skews family-dominated (62% family households, 33% lone person), so amenity decisions tend to follow what families want: parks, schools, supermarkets.
Population
1,844
Median age
44
Family households
62%
Lone person
33%
Demographics data as of May 2026· ABS 2021 Census
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For investors
Investment overview.
Gross Yield (House)
Source: data.sa.gov.au · Oct 2026–
Based on $820,000 median
Gross Yield (Unit)
Source: data.sa.gov.au · Oct 2026–
Based on $190,080 median
Annual Growth (House)
Source: data.sa.gov.au · Oct 2026+13.4%
Year-on-year capital growth
Annual Growth (Unit)
Source: data.sa.gov.au · Oct 2026–
Year-on-year capital growth
Owner Occupancy
Source: ABS Census 2021 · May 202668%
Higher = more owner-occupier demand
Days on Market
Source: data.sa.gov.au · Oct 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.
Safety
Crime and safety.
96
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.
8
0
55
Scores calculated from OpenStreetMap data (ODbL)
Walkability data as of May 2026· OpenStreetMap
Place
Location.
Amenities
Transport
Education
Schools in O'Sullivan Beach.
Local schools for O'Sullivan Beach
View the catchment for each school to find out more.
Government School Catchment
O'Sullivan Beach Primary School
Christies Beach Primary School
Christie Downs Primary School
© 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 O'Sullivan Beach.
- What is the median house price in O'Sullivan Beach?
- The median house price in O'Sullivan Beach, SA 5166 is $820,000 (The SA Government's quarterly suburb median from 9 house sales, the latest published quarter (updated October 2026)). The median unit price is $190,080. Annual growth is +13.4%.
- How much is my house worth in O'Sullivan Beach?
- A useful starting point is the O'Sullivan Beach median house price of $820,000 (units $190,080). Your home will sit above or below that depending on land size, condition, position and what comparable homes nearby have sold for recently. For a figure specific to your property, request a free property appraisal from a local agent using the form on this page.
- Is O'Sullivan Beach a good investment?
- On the published figures, O'Sullivan Beach's median house price rose 13.4% over 12 months, to $820,000 (SA Government, the latest published quarter, updated October 2026). No weekly house rent is published for O'Sullivan Beach, so there is no house yield to work out. Whether O'Sullivan Beach is a good investment for you depends on the price you pay, your loan and holding costs, vacancy and your tax position. These are published market figures, not financial advice.
- What is the O'Sullivan Beach postcode?
- O'Sullivan Beach is in the 5166 postcode, in SA, in the City of Onkaparinga region.
- Where is O'Sullivan Beach?
- O'Sullivan Beach is a suburb of Adelaide, in SA 5166. It is part of the Greater Adelaide area, in the City of Onkaparinga region.
- What schools are in O'Sullivan Beach?
- There are 20 schools serving O'Sullivan Beach on this page, including Southern Montessori School, O'Sullivan Beach Primary School, St John The Apostle Parish School.
- How walkable is O'Sullivan Beach?
- O'Sullivan Beach has a Walk Score of 8 out of 100, highly car-dependent. transit score 0, bike score 55.
- What suburbs are near O'Sullivan Beach?
- O'Sullivan Beach is close to Christies Beach, Christies Beach North, Port Stanvac, Christie Downs, Lonsdale.
- What is the population of O'Sullivan Beach?
- The population of O'Sullivan Beach is approximately 1,844 (2021 Census). The median age is 44.
O'Sullivan Beach
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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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