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Excelsior Springs, city, astride the Ray-Clay county line, western Missouri, U.S., 12 miles (19 km) northeast of Kansas City. Founded in 1880, it developed as a health resort noted for its mineral waters. Today, while mainly residential, it still maintains ties with its past through its Hall of Waters (1938), which claims to have the world’s longest mineral-water bar, and through the sale of bottled waters. Other economic activities are agriculture (corn [maize], livestock, hay,...