Lebanon is a city in Grafton County, New Hampshire, United States. The population was 14,282 at the 2020 census, up from 13,151 at the 2010 census. Lebanon is in western New Hampshire, south of Hanover, near the Connecticut River. It is the home to Dartmouth–Hitchcock Medical Center and Dartmouth College’s Geisel School of Medicine, together comprising the largest medical facility between Boston, Massachusetts, and Burlington, Vermont.

Together with Hanover, New Hampshire, and White River Junction, Vermont, Lebanon is at the center of a Micropolitan Statistical Area, encompassing nearly 30 towns along the upper Connecticut River valley.

Lebanon was chartered as a town by colonial governor Benning Wentworth on July 4, 1761, one of 16 along the Connecticut River. It was named for Lebanon, Connecticut, from where many early settlers had come or would come, including the Rev. Eleazar Wheelock, who arrived in 1770 and founded Dartmouth College. Lebanon, Connecticut, was the original home of Moor’s Charity School, the antecedent of Dartmouth College.

Early settlement concentrated along the Connecticut River in what is now West Lebanon, and in the Mascoma Lake region near Enfield. In the mid-19th century, a mill district developed at falls on the Mascoma River. Industries included, at various times, furniture mills, a tannery, several machine shops, a woolen textile mill, and a clothing factory. In the mid-19th century, this district attracted many French workers from Canada’s Quebec province. This became the center of town, although West Lebanon grew into a railroad hub with a separate identity after lines entered from Boston. This rail center would become known as “Westboro” after two trains collided when West Lebanon was mistaken for Lebanon.

The mill district, like the railroad, declined into the 1950s and 1960s. The town suffered two major fires; the second, in 1964, destroyed a large portion of the old mill district. Reconstruction resulted in a controversial urban renewal project featuring a closed-off district, called The Mall, built to replace the destroyed Hanover Street area. Partly in defiance of economic decline, and partly to counter a movement by West Lebanon to declare itself an independent town, Lebanon re-incorporated as a city in 1958.

The routing of Interstates 89 and 91 through Lebanon and nearby White River Junction, Vermont, in addition to the growth of Dartmouth College, led to the area’s economic revival. The former mill town now has a mixed economy based on education, medical services, high-technology and retail. Just south of the village of West Lebanon, a major shopping district has sprung up at the intersection of Route 12A and I-89. Lebanon has undertaken improvements to its recreational facilities, including miles of hiking trails, a municipal ski area, a swimming pool and several sports fields.