the canton–massillon metropolitan statistical area, as defined by the united states census bureau, is an area consisting of two counties in northeast ohio, anchored by the cities of canton and massillon. as of the 2010 census, the msa had a population of 404,422. the msa is also part of the cleveland–akron–canton, oh combined statistical area, which had a population of 3,515,646 in 2010, making it the largest csa in ohio.