Massillon (măsˈĭlŏn) [key], city (1990 pop. 31,007), Stark co., NE Ohio, on the Tuscarawas River; inc. 1853. A wheat-shipping center on the Ohio & Erie Canal after 1828, it became an industrial city producing steel, steel products, and machinery; among its manufactures now are plastics, automotive products, packaging materials, and processed foods. Jacob S. Coxey, the social reformer, lived in Massillon and was its mayor in the early 1930s. A state park is nearby.