Austin, Texas - Wikipedia Austin ( ˈɔːstɪn ⓘ AW-stin) [8] is the capital city of the U S state of Texas With a population of 961,855 at the 2020 census, [9] it is the 13th-most populous city in the U S , fifth-most populous city in Texas, and second-most populous U S state capital (after Phoenix, Arizona), while the Austin metro area with an estimated 2 55 million residents is the 25th-largest metropolitan