HAMILTON, a city of south-western Ohio, U.S.A., on the Great Miami river, 25m. N. of Cincinnati; the county seat of Butler county. It is the centre of a network of fine roads, and is served by the Baltimore and Ohio, the Erie and the Pennsylvania railways, and by inter-urban electric lines. The population in 192o was 39,675 (9o% native white) and was 52,176 in 193o by the Federal census. The city has a land area of 5.9 sq.m., and an assessed valuation in 1925 of $105,766,830. It is surrounded by a rich farming and stock-raising country. There are beautiful parks and substantial public buildings. The manu facturing industries, with an output in 1925 valued at are varied and important. They include two factories which make three-fourths of the world's supply of bank vaults and safes, a branch of the Ford motor works, one of the largest plants in the world making heavy machine tools, and one of the largest mills making coated paper. A stockade fort was built here in 1791 by Gen. Arthur St. Clair (on the spot now occupied by the Soldiers' and Sailors' monument) and in 1794 a town was laid out and named Fairfield. The fort was abandoned in 1796. About the same time the town was renamed, after Alexander Hamilton. It became the county seat in 1803, was incorporated as a village in 181o, as a city in 1857. Hamilton was the early home of William Dean Howells, where he learned to set type in his father's printing shop, and his recollections of it are embodied in A Boy's Town.