Oyster Bay lies approximately 26 kilometres south of the Sydney central business district. It falls under the administration of Sutherland Shire Council, within southern Sydney.
The suburb recorded a population of around 5,689 in the 2021 Census. The dominant age cohort comprises residents aged 40–49 years.
The usual resident population count stood at 5,560 living in 1,832 dwellings, with an average household size of 3.09 persons.
Oyster Bay covers about 3.1 square kilometres and contains 12 parks, which make up nearly 5.8 per cent of its area.
Most households consist of couples with children and demonstrate high owner-occupation, with approximately 89 per cent of homes owner-occupied in 2021. Mortgage repayments commonly exceed AUD 4,000 per month across these households.
Housing values show a median price of approximately AUD 1,844,500 for a house and around AUD 1,326,000 for a unit. Rental yields average about 3.1 per cent for homes with a median rent of AUD 1,010 per week.
Units have experienced notable growth, including around 16.5 per cent annual capital growth and approximately 9.7 per cent growth in the past quarter.
Most residents were born in Australia, with smaller proportions from other backgrounds, including Asian and Southern European heritage.
On Census day in 2021, only about 2.2 per cent of workers in Oyster Bay used public transport to commute, while 35.1 per cent used private vehicles.
Public transport options remain limited, and many residents rely on nearby hubs such as Jannali or Como for train access, alongside local bus routes.
Oyster Bay offers primary education through Oyster Bay Public School and features a largely peaceful, family-oriented atmosphere.
It hosts a community character that appeals particularly to professionals and families, with the presence of creek‑side bushland and generous green space.
Recreational opportunities include riverside walking paths, local playgrounds and parks, alongside access to Georges River water‑based activities.