 This is made up by 22,600 of un-mixed origin and 745,500 of mixed origin and equates to 4.3 percent of the Australian population.This makes the Cornish the fourth largest Anglo-Celtic group in Australia after the English, Irish and Scottish, and the fifth largest ethnic group in Australia.Approximately 10 percent of the population of South Australia, and over 3 percent of Australia as a whole, has significant Cornish ancestry.