Lyme is a town along the Connecticut River in Grafton County, New Hampshire, United States. The population was 1,716 as of the 2010 census, with an estimated population of 1,674 in 2017. Lyme is home to the Chaffee Natural Conservation Area. The Dartmouth Skiway is in the eastern part of town, near the village of Lyme Center. The Appalachian Trail passes through the town’s heavily wooded eastern end.
According to the United States Census Bureau, the town has a total area of 54.7 square miles (141.7 km), of which 53.8 square miles (139.3 km) is land and 0.9 square miles (2.3 km) is water, comprising 1.62% of the town. Lyme is drained by Hewes, Grant, and Clay brooks, all flowing to the Connecticut River, which forms the western boundary of the town (and of the state of New Hampshire).
The Lyme Common occupies the center of the village of Lyme, located about 1.5 miles (2.4 km) east of the Connecticut River.
Lyme is a rural town. Most human development is in the western half of the town along the Connecticut River and New Hampshire Route 10, known as the Dartmouth College Highway. The eastern half of the town is mostly forest. The town is home to four great ponds: Post Pond, Pout Pond, Trout Pond, and Reservoir Pond. Holts Ledge is a cliff that faces east and is part of the Dartmouth Skiway. The edge of the cliff is fenced to protect falcons. The highest point in town is the summit of Smarts Mountain, at 3,238 feet (987 m) above sea level. A fire tower, which was built in 1915, is visible from miles away atop Smarts Mountain and sets it apart from other local mountains. The Appalachian Trail crosses the summits of Holts Ledge and Smarts Mountain.
As of the census of 2010, there were 1,716 people, 705 households, and 503 families residing in the town. The population density was 31.4 people per square mile (12.1/km²). There were 810 housing units at an average density of 14.8 per square mile (5.7/km²). The racial makeup of the town was 96.9% White, 0.3% African American, 0.3% Native American, 1.1% Asian, 0.3% some other race, and 1.0% from two or more races. Hispanic or Latino of any race were 2.4% of the population.
Of the 705 households 28.5% had children under the age of 18 living with them, 61.3% were headed by married couples living together, 6.5% had a female householder with no husband present, and 28.7% were non-families. 23.5% of all households were made up of householders living alone, and 9.0% were someone living alone who was 65 years of age or older. The average household size was 2.42, and the average family size was 2.86.
In the town, the population was spread out with 22.4% under the age of 18, 4.1% from 18 to 24, 19.5% from 25 to 44, 36.3% from 45 to 64, and 17.8% who were 65 years of age or older. The median age was 47.4 years. For every 100 females, there were 95.4 males. For every 100 females age 18 and over, there were 93.4 males.
Looking at the occupations of employed people in the town over the age of 16, the largest group – 50.9% – is education and health care. The next largest group – 9.6% – is professional, scientific, and management. Construction and manufacturing make up 8.4%; agriculture and forestry make up 0.7%.
For the period 2010 through 2014 the estimated median annual income for a household in the town was $110,781, and the median income for a family was $130,795. Males working full-time, year-round had a median income of $101,875 versus $58,125 for females. The per capita income for the town was $68,381. About 0.6% of families and 3.1% of the population were below the poverty line, including 3.2% of those age 65 or over.