The demography of Australia covers basic statistics, most populous cities, ethnicity and religion. The population of Australia is estimated to be 25,501,800 as of 15 September 2019. Australia is the 52nd most populous country in the world and the most populous Oceanian country. Its population is concentrated mainly in urban areas and is expected to exceed 28 million by 2030.
Australia 2019 population is estimated at 25,203,198 people at mid year according to UN data. Australia population is equivalent to 0.33% of the total world population. Australia ranks number 55 in the list of countries (and dependencies) by population. The population density in Australia is .
According to 2007 statistics from the World Health Organization (WHO), Australia has the third-highest prevalence of overweight adults in the English-speaking world. Obesity in Australia is an "epidemic" with "increasing frequency." The Medical Journal of Australia found that obesity in Australia more than doubled in the two decades preceding 2003, and the unprecedented rise in obesity has.