Amsterdam, city (1990 pop. 20,714), Montgomery co., E central N.Y., on the Mohawk River; inc. 1885. Historically famous for the manufacture of carpets, its manufactures now include machinery, apparel, leather goods, furniture, transporation equipment, and consumer goods. The area was settled in 1783 and was named Amsterdam because of the many early Dutch settlers. Nearby stands Fort Johnson, home of the British colonial leader Sir William Johnson.