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San Antonio ( /ˌsænænˈtoʊni.oʊ/) is the seventh-largest city in the United States of America and the second-largest within the state of Texas, with a population of 1.3 million. The San Antonio-New Braunfels metropolitan area, commonly referred to as Greater San Antonio, has a population of 2.2 million based on the 2011 U.S. Census estimate, making it the 24th-largest metropolitan area in the United States and third-largest in the state of Texas.

The city was named for San Antonio de Padua, whose feast day is on June 13, when a Spanish expedition stopped in the area in 1691. Famous for Spanish missions, the Alamo, the River Walk, the Tower of the Americas, the Alamo Bowl, Marriage Island and host to SeaWorld and Six Flags Fiesta Texas theme parks, the city is visited by approximately 26 million tourists per year according to the San Antonio Convention and Visitors Bureau. The city is home to the four-time NBA champion San Antonio Spurs and the annual San Antonio Stock Show & Rodeo, one of the largest in the country.

San Antonio has a strong military presence—it is home to Fort Sam Houston, Lackland Air Force Base, Randolph Air Force Base, and Brooks City-Base, with Camp Bullis and Camp Stanley outside the city. Kelly Air Force Base operated out of San Antonio until 2001, when the airfield was transferred over to Lackland AFB and the remaining portions of the base became Port San Antonio, an industrial/business park. San Antonio is home to five Fortune 500 companies and the South Texas Medical Center, the only medical research and care provider in the South Texas region.