O’sullivan Beach, SA 5166 — Suburb Profile
Last reviewed: · By Knowburb Research Team
In short
O’sullivan Beach is a suburb of South Australia, postcode 5166, home to 1,844 residents with an established residential profile. Located in the Onkaparinga local government area and roughly 24 km from the Adelaide CBD.
Snapshot
Demographics
- Population
- 1,844
- Median age
- 44 years
- Median household income
- $1,072 /week
- Median personal income
- $599 /week
- Median family income
- $1,367 /week
- Average household size
- 2.2
- Persons per bedroom
- 0.7
- Local government area
- Onkaparinga
- Statistical region (SA4)
- Adelaide - South
- Remoteness classification
- Major Cities of Australia
- Federal electorate
- Kingston
Property & cost of living
- Median rent
- $300 /week
- Median monthly mortgage
- $1,200
- Rent share of household income
- 28%
Schools
- Southern Montessori School Middle Years
- Southern Montessori School
- O'Sullivan Beach Primary School
- St John the Apostle Catholic School
- Lonsdale Heights Primary School
Transport
- Within 800 m walk: 12 bus stops
- Within 1.6 km: 2 train stops, 24 bus stops
- Stop 59 Baden Tce - North side
- Stop 59 Baden Tce - South side
- Stop 60 Baden Tce - North side
- Stop 60 Baden Tce - South side
- Lonsdale Railway Station
Lifestyle & amenities
- 2 cafés
- 1 restaurant
- 29 parks and reserves
- 1 supermarket
- 6 playgrounds
Climate
- Warmest month: Jan (28.3°C avg max)
- Coolest month: Jul (15.0°C avg max)
- Annual rainfall: 437 mm
- Reference station: Adelaide Airport, 18.8 km away
NBN & connectivity
Fibre to the Node serves 55.8% of the 1,028 resolvable premises in O’sullivan Beach. Most premises here connect via fibre to a street cabinet, then copper into the home. Speeds depend heavily on the copper run length — NBN 100 is rarely achievable on long runs.
- Fibre to the Premises: 44.2%
- Fibre to the Node: 55.8%
Safety
- Recorded offences: 110 across postcode 5166 in the year to FY2024–25 (up 16% on the prior year).
- Most common categories: 47 violent offences, 31 property damage, 22 theft.
Frequently asked questions
What is the population of O’sullivan Beach?
O’sullivan Beach (SA 5166) had 1,844 residents at the most recent ABS Census. The median age is 44. It sits within the Onkaparinga local government area.
What is the median rent in O’sullivan Beach?
The median advertised rent in O’sullivan Beach is $300/week, based on SQM Research listings data. Rents vary by property type, bedrooms and condition.
Are there schools in O’sullivan Beach?
Yes — 5 schools are listed within or near O’sullivan Beach covering independent, government sectors. Nearest include: Southern Montessori School Middle Years (0.5 km), Southern Montessori School (1.1 km), O'Sullivan Beach Primary School (1.1 km). School data sourced from ACARA and state education departments.
What NBN technology is available in O’sullivan Beach?
O’sullivan Beach is predominantly served by Fibre to the Node (55.8% of premises). Coverage data is sourced from the NBN upgrade map aggregated from NBN Co address checks.
How safe is O’sullivan Beach?
Across postcode 5166, 110 offences were recorded in the 12 months to FY2024–25. The most common offence categories were violent (47), property damage (31), theft (22). Crime statistics are recorded by area (postcode or LGA), not by individual suburb. Data sourced from each state's crime statistics agency.
What is the climate like in O’sullivan Beach?
In O’sullivan Beach, mean daily temperatures range from 11.5°C to 21.6°C and annual rainfall is 437 mm measured at the Adelaide Airport weather station (18.8 km away). Long-term averages from the Bureau of Meteorology.
What public transport options are in O’sullivan Beach?
26 public transport stops are mapped within 1.6 km of the O’sullivan Beach centroid. Within 800 m, you'll find 12 bus stops. Stop data is sourced from state government GTFS feeds.
Sources & methodology
Demographics from ABS Census. Property data from SQM Research. Climate from Bureau of Meteorology. Schools from ACARA. NBN from NBN Co. Amenities from OpenStreetMap. See full methodology.
Additional sources for this profile: