Colebrook is a town in Coos County, New Hampshire, United States. The population was 2,301 at the 2010 census. Situated in the Great North Woods Region, it is bounded on the west by the Connecticut River and home to Beaver Brook Falls Natural Area.
Colebrook is the hub of northern Coos County, and is the largest town (by population) north of the county seat of Lancaster. Roads from Maine, Vermont, and Quebec all converge in the center of town. To the north is Stewartstown, to the east is Dixville and to the south is Columbia. Lemington, Vermont, is located to the west of town, across the Connecticut River.
The town is located along U.S. Route 3. New Hampshire Route 26 crosses Colebrook from east to west, briefly overlapping U.S. 3. The southern terminus of New Hampshire Route 145 is also located in Colebrook, providing a second route northward to Pittsburg and Canada.
According to the United States Census Bureau, the town has a total area of 40.9 square miles (106 km), of which 40.7 square miles (105 km) is land and 0.2 square miles (0.52 km) is water, comprising 0.50% of the town. The highest point in Colebrook is Van Dyck Mountain, elevation 2,760 feet (840 m) above sea level. The town’s western view is dominated by Monadnock Mountain, elevation 3,148 ft (960 m), in Lemington, Vermont. Colebrook is drained by Beaver Brook and the Mohawk River, which flows into the Connecticut River. The town lies almost fully within the Connecticut River watershed, with a tiny portion of the northeast corner of town lying in the Androscoggin River watershed.
At the first census of 1790 there were 29 residents.
As of the census of 2010, there were 2,301 people, 1,073 households, and 612 families residing in the town. There were 1,429 housing units, of which 356, or 24.9%, were vacant. 245 of the vacant units were for seasonal or recreational use. The racial makeup of the town was 97.4% white, 0.2% African American, 0.3% Native American, 0.7% Asian, 0.0% Native Hawaiian or Pacific Islander, 0.2% some other race, and 1.2% from two or more races. 1.2% of the population were Hispanic or Latino of any race.
Of the 1,073 households, 24.3% had children under the age of 18 living with them, 43.9% were headed by married couples living together, 9.3% had a female householder with no husband present, and 43.0% were non-families. 36.2% of all households were made up of individuals, and 17.9% were someone living alone who was 65 years of age or older. The average household size was 2.14, and the average family size was 2.73.
In the town, 19.5% of the population were under the age of 18, 6.2% were from 18 to 24, 22.8% from 25 to 44, 31.9% from 45 to 64, and 19.6% were 65 years of age or older. The median age was 45.8 years. For every 100 females, there were 97.0 males. For every 100 females age 18 and over, there were 95.7 males.
For the period 2011-2015, the estimated median annual income for a household was $45,375, and the median income for a family was $54,063. Male full-time workers had a median income of $38,295 versus $35,637 for females. The per capita income for the town was $25,383. 17.3% of the population and 8.5% of families were below the poverty line. 30.3% of the population under the age of 18 and 3.5% of those 65 or older were living in poverty.