Austin is the capital city of the U.S. state of Texas, as well as the seat and largest city of Travis County, with portions extending into Hays and Williamson counties
Dallas is a city in the U.S. state of Texas and the largest city and seat of Dallas County, with portions extending into Collin, Denton, Kaufman and Rockwall counties.
Houston is the most populous city in the U.S. state of Texas, fourth most populous city in the United States, most populous city in the Southern United States, as well as the sixth most populous in North America, with an estimated 2019 population of 2,320,268.
San Antonio, officially the City of San Antonio, is the seventh-most populous city in the United States, and the second-most populous city in both Texas and the Southern United States, with 1,547,253 residents in 2019.