Lost Springs is a city in Marion County, Kansas, United States. It was named for the old lost spring near the city. As of the 2010 census, the city population was 70.For many millennia, the Great Plains of North America was inhabited by nomadic Native Americans. From the 16th century to 18th century, the Kingdom of France claimed ownership of large parts of North America. In 1762, after the French and Indian War, France secretly ceded New France to Spain, per the Treaty of Fontainebleau.In 1802, Spain returned most of the land to France. In 1803, most of the land for modern day Kansas was acquired by the United States from France as part of the 828,000 square mile Louisiana Purchase for 2.83 cents per acre.From the 1820s to the 1870s, one of the most significant land routes in the United States was the Santa Fe Trail. The "Lost Spring" was one of the favorite camping spots on the Santa Fe Trail because it generally had an ample supply of good water.