Suncook is a census-designated place (CDP) in Merrimack County, New Hampshire, United States. The population was 5,379 at the 2010 census. Approximately two-thirds of Suncook is located in the town of Pembroke, with the remainder in Allenstown.
Suncook is located in the southern corner of the town of Pembroke and the western end of the town of Allenstown. The Suncook River runs through the center of the village and forms the boundary between the two towns. The CDP is bordered to the south by the town of Hooksett and to the west by the Merrimack River, which forms the Bow town line.
U.S. Route 3 runs through the east side of the CDP, leading northwest 7 miles (11 km) to Concord, the capital of New Hampshire, and south 10 miles (16 km) to Manchester, the state’s largest city. New Hampshire Route 28 leads south from Suncook with Route 3 but leads northeast up the Suncook River valley 15 miles (24 km) to Pittsfield.
According to the United States Census Bureau, the Suncook CDP has a total area of 3.9 square miles (10.0 km), of which 3.7 square miles (9.6 km) are land and 0.2 square miles (0.4 km), or 4.23%, are water.
As of the census of 2010, the Suncook CDP had a population of 5,379, of whom 3,585 (66.6%) lived in the town of Pembroke and 1,794 (33.4%) lived in the town of Allenstown. There were 2,236 households and 1,375 families residing in the CDP. There were 2,408 housing units, of which 172, or 7.1%, were vacant. The racial makeup of the CDP was 95.9% white, 0.9% African American, 0.4% Native American, 0.9% Asian, 0.02% Pacific Islander, 0.4% some other race, and 1.6% from two or more races. 1.8% of the population were Hispanic or Latino of any race.
Of the 2,236 households in the CDP, 30.9% had children under the age of 18 living with them, 43.8% were headed by married couples living together, 12.3% had a female householder with no husband present, and 38.5% were non-families. 29.7% of all households were made up of individuals, and 9.4% were someone living alone who was 65 years of age or older. The average household size was 2.38, and the average family size was 2.95.
22.9% of residents in the CDP were under the age of 18, 7.4% were from age 18 to 24, 28.7% were from 25 to 44, 28.2% were from 45 to 64, and 13.0% were 65 years of age or older. The median age was 39.0 years. For every 100 females, there were 90.7 males. For every 100 females age 18 and over, there were 89.0 males.
For the period 2011-15, the estimated median annual income for a household was $56,181, and the median income for a family was $78,814. Male full-time workers had a median income of $45,154 versus $43,118 for females. The per capita income for the CDP was $26,148. 10.7% of the population and 5.9% of families were below the poverty line, along with 10.6% of people under the age of 18 and 7.1% of people 65 or older.