Mankato (mănkāˈtō) [key], city (1990 pop. 31,477), seat of Blue Earth co., S Minn., at the confluence of the Blue Earth and Minnesota rivers; inc. 1865. It is a trade and processing center for a farm and dairy region. Industries include soybean processing and the manufacture of flour, feeds, building materials, and computer equipment. Mankato stone has been quarried there for over 100 years. The city is the seat of Minnesota State Univ., Mankato. Sibley Park in Mankato was the site of Camp Lincoln, where more than 300 Sioux were held and 38 of them hanged, after their revolt in 1862. A state park, with waterfalls, adjoins the city.