DANVILLE, a borough of Montour county, Pa., U.S.A., on the high northern bank of the Susquehanna river, at the base of Montour ridge, II om. N.W. of Philadelphia; the county seat and an active manufacturing centre. It is on Federal highway II, and is served by the Lackawanna, the Pennsylvania and the Reading railways. The population was 6,952 in 192o, and was 7,185 in 193o by the Federal census. Limestone abounds in the vicinity, and the borough has large iron and steel works, silk and stocking mills and other industries. It is the seat of a State hospital for the insane (established 1868). A settlement was made here about 1776, and in 1792 a town was laid out, called Dan's Town, after one of the founders. With the discovery of iron ore on Montour ridge, and the completion of the north branch of the Pennsylvania canal through the borough, it grew rapidly, and was incorporated in 1849. The iron deposits are now exhausted and ore is imported by the local mills. The first "T" rail in America was rolled here in 1845.