Yoljffgstowff, a city and the county seat of Mahoning co., Ohio, on the Mahoning river, 135 m. N. E. of Columbus, 60 m. S. E. of Cleveland, and 60 m. N. N. W. of Pittsburgh, Pa.; pop. in 1860, 2,759; in 1870, 8,075; in 1876, locally estimated at 15,000. It has a street railroad, a new court house and jail which cost $150,000, an elegant opera house, several fine hotels, and many handsome residences. It is situated in a rich agricultural region, which abounds in coal and iron, and has an important trade. Railroad facilities are afforded by the Ashtabula, Youngstown, and Pittsburgh and the Painesville and Youngstown lines, the Mahoning division of the Atlantic and Great Western, and the Youngstown branch of the Lake Shore and Michigan Southern. Coal mining and iron manufacturing are the chief interests. There are seven rolling mills, eleven blast furnaces, two founderies, a nut and bolt factory, etc. The city contains two national banks, eight school houses, an endowed academy, a daily and four weekly (one German) newspapers, and 18 churches.

It was settled about 1800, and was made the county seat in 1874.