Gallatin, city (1990 pop. 18,794), seat of Sumner co., N central Tenn., near Nashville; inc. 1815. It is a livestock and agricultural center that produces tobacco. Tennessee walking horses are bred, and manufactures include motor vehicle parts, tobacco goods, furniture, and boats. Nearby is Old Hickory Lake, a fishing and recreation area. The city is named for Albert Gallatin, secretary of the treasury under Presidents Jefferson and Madison. Andrew Jackson's home, the Hermitage, is nearby.