Hudson. 1 Industrial town (1990 pop. 17,233), Middlesex co., E central Mass., on the Assabet River, in an apple-growing region; settled c.1699, inc. 1866. Manufactures include communications equipment, locks, chemicals, plastics, electronic and metal products, and semiconductors. 2 City (1990 pop. 19,530), Hillsborough co., S N.H., on the Merrimack River opposite Nashua; est. 1673 as part of Dunstable, Mass., included in New Hampshire as Nottingham West in 1746; name changed to Hudson in 1830. There are various industries, such as apparel and textiles, sheet-metal fabrication, and printing; however, the city's growth mainly is due to the establishment of high-technology computer industries and added housing developments in the area. 3 City (1990 pop. 8,034), seat of Columbia co., SE N.Y. on the Hudson River; settled c.1622 by the Dutch and later in 1783 by English whalers; inc. 1785. The city was a whaling and trading port until 1812. Its industries included textiles, furniture, cement, and metal products, but these are now largely gone; Hudson has become an antiques center. Many colonial and Revolutionary era homes are in the area.