PEOPLE OVERVIEW : The 2016 Austin, Texas, population is 931,830. There are 3,004 people per square mile (population density). Family in Austin, Texas. The median age is 31.8. The US median is 37.4. 41.66% of people in Austin, Texas, are married. 11.41% are divorced. The average household size is 2.45 people. 33.68% of people are married, with children. 19.91% have children, but are single. Race in Austin, Texas. 48.66% of people are white, 7.50% are black, 6.49% are asian, 0.18% are native american, and 0.14% claim 'Other'. 34.83% of the people in Austin, Texas, claim hispanic ethnicity (meaning 65.17% are non-hispanic).