Claremont, city, Sullivan county, western New Hampshire, U.S., on the Sugar River near its junction with the Connecticut River. Settled in 1762, Claremont was organized as a town in 1764 and was probably named for the duke of Newcastle’s country estate in England. Waterpower for early industry was provided by the Sugar River, and completion of the Concord and Claremont Railroad (1871–72) gave impetus to economic growth. Manufactures include machinery, paper, flock, paintbrushes, and electronic items. Inc. city, 1947. Pop. (2000) 13,151; (2010) 13,355.