Lebanon is a city in Grafton County, New Hampshire, United States. The population was 12,568 at the 2000 census. Lebanon is located in western New Hampshire, south of Hanover, near the Connecticut River. It is the home to Dartmouth-Hitchcock Medical Center and Dartmouth Medical School, together comprising the largest medical facility between Boston, Massachusetts and Burlington, Vermont. Together with Hanover and White River Junction, Lebanon today is center of a Micropolitan Statistical Area, encompassing nearly 30 towns along the upper Connecticut River valley.