San Antonio ( SAN an-TOH-nee-oh; Spanish for "Saint Anthony") is a city in the U.S. state of Texas. It is the seventh-most populous city in the United States, second-most populous city in Texas and second-most populous city in the Southern United States, with a population of 1.43 million at the 2020 census. The San Antonio metropolitan area, with an estimated 2.76 million residents, ranks as the third-largest metropolitan area in Texas and the 24th-largest in the nation. It is the county seat of Bexar County. Founded in 1718 as a Spanish mission and colonial outpost, San Antonio became the first chartered civil settlement in present-day Texas in 1731. The city was named in 1691 by a Spanish expedition in honor of Saint Anthony of Padua. It was part of the Spanish Empire, then the Mexican Republic from 1821 to 1836, before joining the United States. Straddling the regional divide between South and Central Texas, San Antonio anchors the southwestern corner of an urban megaregion colloquially known as the Texas Triangle. It lies about 80 miles (130 km) from downtown Austin along the I-35 corridor, and together the San Antonio–Austin metroplex is home to approximately 5 million people. San Antonio is home to five 18th-century Spanish frontier missions, including the Alamo and those preserved in San Antonio Missions National Historical Park, which were collectively designated as UNESCO World Heritage sites in 2015. Major attractions include the River Walk, Tower of the Americas, SeaWorld San Antonio, Six Flags Fiesta Texas, and the Alamo Bowl. The city also hosts the San Antonio Stock Show & Rodeo and is home to the five-time National Basketball Association (NBA) champion San Antonio Spurs. San Antonio welcomes approximately 32 million visitors annually and is a key military hub, hosting several major U.S. Armed Forces facilities, including Fort Sam Houston and nearby bases such as Lackland and Randolph Air Force Bases. The city is also home to four Fortune 500 companies, the South Texas Medical Center, and one of the largest majority-Hispanic populations in the U.S., with 64% of residents identifying as Hispanic.