2020 census As of the
2020 census, South Yarmouth had a population of 11,703. The median age was 53.4 years. 14.9% of residents were under the age of 18 and 31.5% of residents were 65 years of age or older. For every 100 females there were 88.7 males, and for every 100 females age 18 and over there were 85.5 males age 18 and over. 100.0% of residents lived in urban areas, while 0.0% lived in rural areas. There were 5,327 households in South Yarmouth, of which 19.4% had children under the age of 18 living in them. Of all households, 41.7% were married-couple households, 18.2% were households with a male householder and no spouse or partner present, and 33.4% were households with a female householder and no spouse or partner present. About 35.5% of all households were made up of individuals and 20.7% had someone living alone who was 65 years of age or older. of 2000, there were 11,603 people, 5,485 households, and 3,181 families residing in the CDP. The
population density was 640.0/km (1,656.9/mi). There were 7,834 housing units at an average density of 432.1/km (1,118.7/mi). The racial makeup of the CDP was 94.74%
White, 1.53%
African American, 0.34%
Native American, 0.63%
Asian, 0.06%
Pacific Islander, 1.03% from
other races, and 1.66% from two or more races.
Hispanic or
Latino of any race were 1.63% of the population. There were 5,485 households, out of which 18.8% had children under the age of 18 living with them, 44.8% were
married couples living together, 9.8% had a female householder with no husband present, and 42.0% were non-families. 36.3% of all households were made up of individuals, and 22.3% had someone living alone who was 65 years of age or older. The average household size was 2.08 and the average family size was 2.67. In the CDP, the population was spread out, with 17.1% under the age of 18, 4.7% from 18 to 24, 23.2% from 25 to 44, 22.6% from 45 to 64, and 32.4% who were 65 years of age or older. The median age was 49 years. For every 100 females, there were 83.5 males. For every 100 females age 18 and over, there were 78.8 males. The median income for a household in the CDP was $37,643, and the median income for a family was $44,325. Males had a median income of $35,476 versus $26,118 for females. The
per capita income for the CDP was $20,609. About 5.5% of families and 7.3% of the population were below the
poverty line, including 11.3% of those under age 18 and 3.9% of those age 65 or over. ==Education==