There are eight states in Australia. The most populous state is New South Wales with population of approximately 8 million people. Three largest states (NSW, Victoria and Queensland) together include 78% of total Australian population. List of all states can be found below maps.
Population, population density [p/km²] and population change [%/y] 
States in ABC order:
 Australian Bureau of Statistics, Australian Government abs.gov.au (ABS.Stat) ret. 2018-11-04