HILLSBORO, a village of south-western Ohio, U.S.A., 48m. E. by N. of Cincinnati; the county seat of Highland county. It is on Federal highway 5o, and is served by the Baltimore and Ohio and the Norfolk and Western railways. The population in 1920 was 4,356; in 1930, 4,040. It has factories making bells, hardware and furniture, a poultry-packing house and flour-mills.