Hamilton, city (1990 pop. 61,368), seat of Butler co., SW Ohio, on the Great Miami River; inc. 1857. An agricultural trading and manufacturing center, Hamilton has paper and pulp mills and produces safes, machinery, chemicals, textiles, and auto parts. Steel and insurance are also important. Hamilton was settled on the site of Fort Hamilton, built in 1791. William Dean Howells was raised there. Points of interest include the Soldiers', Sailors', and Pioneers' Monument and the county historical society. Miami Univ. of Ohio has a branch in Hamilton.