data sydney 2023Sydney's 2025 population is now estimated at 5,248,790. In 1950, the population of Sydney was 1,689,940. Sydney has grown by 63,890 in the last year, which represents a 1.23% annualThe City of Sydney Estimated Resident Population for 2025 is 237,278, with a population density of 8,892 persons per square km. Sydney is the capital of New South Wales.