What is the population of Sydney Australia?

Statistical Divisions (SDs) are defined by the Australian Bureau of Statistics as areas under the unifying influence of one or more major towns or cities. Each capital city forms its own Statistical Division, and in Australia the population of the SD is the most-often quoted figure for that city's population. Statistical Districts are defined as non-capital but predominantly urban areas. The Australian Government treats divisions and districts with more than 100,000 people as metropolitan.