Dummer is a town in Coos County, New Hampshire, United States. The population was 304 at the 2010 census. It is part of the Berlin, NH–VT micropolitan statistical area. Dummer is home to the Pontook Reservoir, popular with canoeists, kayakers and birdwatchers. In the western part of Dummer lies the village of Paris.
According to the United States Census Bureau, the town has a total area of 49.5 square miles (128 km), of which 48.2 square miles (125 km) is land and 1.2 square miles (3.1 km) is water, comprising 2.43% of the town. The highest point in Dummer is the summit of Cow Mountain, at 2,289 feet (698 m) above sea level. Roughly the western third of Dummer lies within the Connecticut River watershed, where it is drained by the Upper Ammonoosuc River, with the eastern two-thirds in the Androscoggin River watershed. The former community of Paris is in the western part of town, along Phillips Brook.
Dummer is bordered by Milan to the south, Errol and Millsfield to the north, Cambridge to the east, and Odell and Stark to the west.
Dummer is crossed by New Hampshire Route 16.
As of the census of 2000, there were 309 people, 128 households, and 102 families residing in the town. The population density was 6.5 people per square mile (2.5/km²). There were 252 housing units at an average density of 5.3 per square mile (2.0/km²). The racial makeup of the town was 98.71% White, 0.32% Asian, and 0.97% from two or more races.
There were 128 households out of which 30.5% had children under the age of 18 living with them, 64.8% were married couples living together, 10.9% had a female householder with no husband present, and 20.3% were non-families. 19.5% of all households were made up of individuals and 5.5% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.73.
In the town, the population was spread out with 24.3% under the age of 18, 3.9% from 18 to 24, 28.5% from 25 to 44, 30.4% from 45 to 64, and 12.9% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 103.3 males. For every 100 females age 18 and over, there were 100.0 males.
The median income for a household in the town was $32,750, and the median income for a family was $42,708. Males had a median income of $29,286 versus $22,083 for females. The per capita income for the town was $16,754. About 4.6% of families and 6.7% of the population were below the poverty line, including 2.4% of those under the age of eighteen and 10.0% of those sixty five or over.