St. Louis ( or ) is a city and port in the U.S. state of Missouri. The city developed along the western bank of the Mississippi River, which forms Missouri's border with Illinois. In 2010, St. Louis had a population of 319,294; a 2014 estimate put the population at 317,419, making it the 60th-most populous U.S. city and the second-largest city in the state in terms of city proper population. The St. Louis metropolitan area includes the city as well as nearby areas in Missouri and Illinois; with an estimated population of 2,905,893, it is the largest in Missouri and one of the largest in the United States. St. Louis was founded in 1764 by Pierre Laclède and Auguste Chouteau and named after Louis IX of France. Claimed first by the French, who settled mostly east of the Mississippi River, the region in which the city stands was ceded to Spain following France's defeat in the Seven Years' War. Its territory east of the Mississippi was ceded to the Kingdom of Great Britain, the victor. The area of present-day Missouri was part of Spanish Louisiana from 1762 until 1803.