South Berwick is a town in York County, Maine, United States. The population was 7,220 at the 2010 census. South Berwick is home to Berwick Academy, a private, co-educational university-preparatory day school founded in 1791.
According to the United States Census Bureau, the town has a total area of 32.64 square miles (84.54 km), of which, 32.13 square miles (83.22 km) of it is land and 0.51 square miles (1.32 km) water. Located beside the New Hampshire border, South Berwick is drained by the Great Works River and Salmon Falls River. Welch Hill, elevation 370 feet (112.8 m) above sea level, is the town’s highest point. The lowest elevation, which is sea level, is located along the Salmon Falls River from the small hydroelectric dam next to the New Hampshire Route 4 bridge south to the town’s border with Eliot.
As of the census of 2010, there were 7,220 people, 2,729 households, and 1,979 families residing in the town. The population density was 224.7 inhabitants per square mile (86.8/km). There were 2,911 housing units at an average density of 90.6 per square mile (35.0/km). The racial makeup of the town was 97.5% White, 0.2% African American, 0.2% Native American, 0.8% Asian, 0.2% from other races, and 1.1% from two or more races. Hispanic or Latino of any race were 0.8% of the population.
There were 2,729 households of which 38.3% had children under the age of 18 living with them, 59.1% were married couples living together, 9.4% had a female householder with no husband present, 4.0% had a male householder with no wife present, and 27.5% were non-families. 21.3% of all households were made up of individuals and 7.9% had someone living alone who was 65 years of age or older. The average household size was 2.64 and the average family size was 3.09.
The median age in the town was 40.5 years. 26.6% of residents were under the age of 18; 7.3% were between the ages of 18 and 24; 23.5% were from 25 to 44; 32.4% were from 45 to 64; and 10.1% were 65 years of age or older. The gender makeup of the town was 49.4% male and 50.6% female.
As of the census of 2000, there were 6,671 people, 2,403 households, and 1,847 families residing in the town. The population density was 207.5 people per square mile (80.1/km²). There were 2,488 housing units at an average density of 77.4 per square mile (29.9/km²). The racial makeup of the town was 97.63% White, 0.30% African American, 0.30% Native American, 0.66% Asian, 0.27% from other races, and 0.84% from two or more races. Hispanic or Latino of any race were 0.67% of the population.
There were 2,403 households out of which 44.0% had children under the age of 18 living with them, 64.3% were married couples living together, 8.7% had a female householder with no husband present, and 23.1% were non-families. 18.4% of all households were made up of individuals and 6.7% had someone living alone who was 65 years of age or older. The average household size was 2.76 and the average family size was 3.17.
In the town, the population was spread out with 30.4% under the age of 18, 5.4% from 18 to 24, 32.8% from 25 to 44, 23.0% from 45 to 64, and 8.4% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 97.4 males. For every 100 females age 18 and over, there were 93.0 males.
The median income for a household in the town was $53,201, and the median income for a family was $59,330. Males had a median income of $40,107 versus $25,729 for females. The per capita income for the town was $21,118. About 2.8% of families and 2.9% of the population were below the poverty line, including 1.3% of those under age 18 and 7.1% of those age 65 or over.