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Galveston County is a county located in the U.S. state of Texas within the Houston � Sugar Land � Baytown metropolitan area. As of the 2010 U.S. Census, the population was 291,309. Its county seat is Galveston. League City is the largest city in Galveston County in terms of population; between 2000 and 2005 it surpassed Galveston as the county's largest city. Galveston County was founded in 1838. |