DILLENBURG, a town of Hesse-Nassau, Prussia, Germany, in wooded country, on the Dill, 25 m. N.W. from Giessen on the railway to Tr o i s d o r f. Pop.
On an eminence above it lie the ruins of the castle of Dillenburg, founded by Count Henry the Rich of Nassau, about the year 1255, and the birthplace of Prince William of Orange . It has a chamber of commerce. Its industries embrace iron-works, bronze works, colour-works, tanneries and the manu facture of cigars. Owing to its beautiful surroundings Dillenburg has become a favourite summer resort.