🔍

O'Sullivan Beach

SA 5166 • Greater Adelaide

1,844
Population (2021)
$55,744
Median Household Income
1.86 km²
Area
$300/wk
Median Rent
CoastalAffordableRetirement-FriendlyQuietSeaside

About O'Sullivan Beach

O'Sullivan Beach is a seaside suburb in southern Adelaide, approximately 30 km south of the CBD within the City of Onkaparinga. Established in 1926, it has a population of around 1,850 with a notably older demographic and high proportion of single-person households at 63%. The suburb sits along Gulf St Vincent between Christies Beach and Lonsdale.

The suburb offers a relaxed coastal lifestyle with its own beach and boat ramp providing access to Gulf St Vincent. O'Sullivan Beach is popular with retirees and singles seeking affordable seaside living, with a median house price around $738,000. The Southern Montessori School serves local families, and nearby Colonnades Shopping Centre in Noarlunga provides major retail amenities.

O'Sullivan Beach falls under postcode 5166 and is governed by Onkaparinga Council (LGA). For state elections, residents vote in the Reynell electorate.

📍 Location

State
South Australia
Postcode
5166
Urban Area
Onkaparinga - North Coast
LGA / Council
Onkaparinga
Federal Electorate
Kingston
State Electorate
Reynell
Type
Major Urban
Timezone
Adelaide (UTC+9:30)
Coordinates
-35.12°, 138.48°
Statistical Area
Greater Adelaide
Area
1.86 km²
Elevation
38m

🏷️ Property Prices March quarter 2026

Median sale prices in O'Sullivan Beach for the March quarter 2026. Median house sale prices published by the Office of the Valuer-General SA (Adelaide metropolitan area).

🏡House
$780K
12 sales · YoY n/a

Source: Office of the Valuer-General SA — Metropolitan Median House Sales. Houses only — South Australia does not publish a unit/apartment series. Medians are for the latest quarter; year-on-year change is shown only where both quarters had at least 10 sales.

🏠 Housing 2021 Census

Median Rent (weekly)
$300
Median Mortgage (monthly)
$1,200
Avg Household Size
2.2 people
Median Age
44 years
Social Housing (% of dwellings)
6.4%

44 state housing + 8 community housing dwellings (ABS 2021 Census)

🚌 Transport & Commute

Nearest Train Stations

Christie Downs
2.5 km
30 min
Noarlunga Centre
3.8 km
46 min
Christies Beach
2 km
24 min

Bus Services

  • 751 — Noarlunga Centre Interchange 15 min
  • 755 — Seaford via Christies Beach 10 min

Commute to Adelaide CBD

Distance
30 km
By Train
50-60 min
By Car (Peak)
40-55 min
By Car (Off-Peak)
30-35 min

🛣️ Train from Christies Beach or Christie Downs on Seaford Line

Walkability Car-Dependent

Limited local shops; most errands require driving to Christies Beach or Noarlunga Centre.

🛒 Supermarkets Nearby

No major supermarkets listed for this suburb.

🎓 Schools

🎓 Educational Institution Attending 2021 Census

School Sector Breakdown

👥 Demographics

Census 2016
1,879
Census 2021
1,844
▼ 1.9% decline

Population Growth

Gender Distribution (Census 2021)

Personal Income 2016
$26,260
Personal Income 2021
$31,148
▲ 18.6% increase

2021 Census income breakdown

Personal = median for one earner. Household = all members of a dwelling pooled. Family = related members only. Annual = weekly × 52.

Personal
$31,148 / yr
$599/wk
Household
$55,744 / yr
$1072/wk
Family
$71,084 / yr
$1367/wk

Personal Income Comparison (2016 vs 2021)

📊 Population: ABS Census 2021
💰 Income: ABS Census 2021

🌍 Country of Birth 2021 Census

Born in Australia 1,396
Born Overseas 352

Top Countries of Birth (excl. Australia)

  • 1. England 157
  • 2. Germany 25
  • 3. New Zealand 22
  • 4. South Africa 19
  • 5. Scotland 15
  • 6. China 9
  • 7. Netherlands 9
  • 8. United States 9
  • 9. Japan 7
  • 10. Papua New Guinea 6

🧬 Ancestry 2021 Census

Top ancestries reported (people may report up to two)

English 911
Australian 735
Scottish 175
Irish 170
German 157
Australian Aboriginal 74
Italian 52
Dutch 37
Welsh 19
Greek 18

👨‍👩‍👧 Parents' Birthplace 2021 Census

1,072
Both parents born in Australia
442
Both parents born overseas
240
One parent AU, one overseas

🛐 Religion 2021 Census

No Religion
60.7%
Christianity
30.4%
Buddhism
0.5%
Hinduism
0.4%
Islam
0.2%

📊 Age Distribution 2021 Census

0-4 years
81 (4.4%)
5-14 years
193 (10.5%)
15-19 years
93 (5.0%)
20-24 years
80 (4.3%)
25-34 years
250 (13.6%)
35-44 years
240 (13.0%)
45-54 years
227 (12.3%)
55-64 years
226 (12.3%)
65-74 years
266 (14.4%)
75-84 years
149 (8.1%)
85+ years
33 (1.8%)

Nearby Suburbs

Frequently Asked Questions

What is O'Sullivan Beach known for? +

O'Sullivan Beach is a seaside suburb in southern Adelaide, approximately 30 km south of the CBD within the City of Onkaparinga. The suburb offers a relaxed coastal lifestyle with its own beach and boat ramp providing access to Gulf St Vincent.

How far is O'Sullivan Beach from Adelaide CBD? +

O'Sullivan Beach is approximately some distance from Adelaide CBD, with a typical drive taking around 30-60 minutes depending on traffic and route taken.

Does O'Sullivan Beach have public transport? +

O'Sullivan Beach has limited public transport options. The area is best accessed by private vehicle, with connections to larger regional centres for broader services.

What is the population of O'Sullivan Beach? +

According to the 2021 Census, O'Sullivan Beach has a population of approximately 1,844 residents, a modest but established community. The suburb falls within the Onkaparinga (City) local government area.

Is O'Sullivan Beach a good place to live? +

O'Sullivan Beach is highly appealing to those seeking a coastal lifestyle, with easy access to beaches, waterways, and outdoor recreation. It suits families, retirees, and sea-changers looking for a relaxed pace of life close to nature.

What is the postcode for O'Sullivan Beach? +

The postcode for O'Sullivan Beach, SA is 5166. This postcode covers O'Sullivan Beach and may also serve nearby localities within the same postcode zone.

What is the average income in O'Sullivan Beach? +

Based on the 2021 Census, the median personal income in O'Sullivan Beach is about $599 per week (around $31,100 per year). The median household income is $1,072 per week and the median family income is $1,367 per week.

What is the median house price in O'Sullivan Beach? +

As of March quarter 2026, the median house price is $780,000. Figures are based on Office of the Valuer-General SA — Metropolitan Median House Sales.

What is the age profile of O'Sullivan Beach? +

The median age in O'Sullivan Beach is 44. The largest age group is 65–74 (266 residents, around 14%). Around 20% of residents are under 20 and about 24% are aged 65 or older. (2021 Census)

How much is rent in O'Sullivan Beach? +

In O'Sullivan Beach, the median weekly rent is $300, and the median monthly mortgage repayment is $1,200 (2021 Census).