Iserlohn, a town in the Prussian province of Westphalia, on the Baar, in a bleak and hilly region, 17 m. W. of Arnsberg, and 30 m. E.N.E. from Barmen by rail. Pop. (1900) 27,265. Iserlohn is one of the most important manufacturing towns in Westphalia. Both in the town and neighbourhood there are numerous foundries and works for iron, brass, steel and bronze goods, while other manufactures include wire, needles and pins, fish-hooks, machinery, umbrella-frames, thimbles, bits, furniture, chemicals, coffee-mills, and pinchbeck and britannia-metal goods. Iserlohn is a very old town, its gild of armourers being referred to as “ancient” in 1443.