Lebanon locally /ˈlɛbənən/ is the only city in Grafton County, New Hampshire, United States. The population was 13,151 at the 2010 census and an estimated 13,602 as of 2018. Lebanon is 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.
According to the United States Census Bureau, the city has a total area of 41.4 square miles (107.1 km), of which 40.3 square miles (104.4 km) is land and 1.0 square mile (2.6 km) is water, comprising 2.45% of the city. The western boundary of Lebanon is the Connecticut River, which is also the state boundary with Vermont. The village of West Lebanon occupies the western part of the city, along the Connecticut River. Downtown Lebanon is 3 miles (5 km) to the east, along the Mascoma River, a tributary of the Connecticut. The city is fully within the Connecticut River watershed. The southern end of Moose Mountain is in the northeast. The highest point in Lebanon is the northern end of Shaker Mountain, at 1,657 feet (505 m) above sea level, on the eastern border of the city.
As of the census of 2010, there were 13,151 people, 6,186 households, and 3,269 families residing in the city. The population density was 326.2 people per square mile (125.9/km²). There were 6,649 housing units at an average density of 164.9 per square mile (63.7/km²). The racial makeup of the city was 88.4% White, 1.6% African American, 0.30% Native American, 6.8% Asian, 0.00% Pacific Islander, 0.80% some other race, and 2.10% from two or more races. Hispanic or Latino of any race were 2.9% of the population.
There were 6,186 households out of which 24.2% had children under the age of 18 living with them, 40.5% were married couples living together, 8.9% had a female householder with no husband present, 3.4% had a male householder with no wife present, and 47.2% were non-families. 36.8% of all households were made up of individuals, and 12.4% were someone living alone who was 65 years of age or older. The average household size was 2.10, and the average family size was 2.76.
In the city, the population was spread out with 20.5% from age 0-19, 6.3% from 20 to 24, 30.3% from 25 to 44, 27.6% from 45 to 64, and 15.3% who were 65 years of age or older. The median age was 39.4 years. The male population was 47.4% of the total, while the female population was 52.6%.
For the period 2011-15, the estimated median annual income for a household in the city was $53,004, and the median income for a family was $75,511. Male full-time workers had a median income of $51,735 versus $48,836 for females. The per capita income for the city was $36,370. About 8.7% of families and 12.3% of the entire population were below the poverty line, including 22.6% of those under 18 and 5.0% of those age 65 and over.