2020 census As of the
2020 census, Seaford had a population of 15,251. The median age was 43.6 years. 20.3% of residents were under the age of 18 and 19.3% of residents were 65 years of age or older. For every 100 females there were 94.6 males, and for every 100 females age 18 and over there were 91.4 males age 18 and over. 100.0% of residents lived in urban areas, while 0.0% lived in rural areas. There were 5,293 households in Seaford, of which 32.8% had children under the age of 18 living in them. Of all households, 64.2% were married-couple households, 11.0% were households with a male householder and no spouse or partner present, and 20.9% were households with a female householder and no spouse or partner present. About 16.9% of all households were made up of individuals and 10.2% had someone living alone who was 65 years of age or older. of 2000, there were 15,791 people, 5,257 households, and 4,200 families residing in the CDP. The population density was . There were 5,358 housing units at an average density of . The racial makeup of the CDP was 99.8%
white, .15%
African American, .06%
Native American, .68%
Asian, .02%
Pacific Islander, .54% from
other races, and .59% from two or more races.
Hispanic or
Latino people of any race were 1.71% of the population. There were 5,257 households, out of which 37.2% had children under the age of 18 living with them, 68.4% were
married couples living together, 8.6% had a female householder with no husband present, and 20.1% were non-families. 16.3% of all households were made up of individuals, and 8.3% had someone living alone who was 65 years of age or older. The average household size was 3.00 and the average family size was 3.38. In the CDP, the population was spread out, with 25.2% under the age of 18, 6.9% from 18 to 24, 30.2% from 25 to 44, 23.9% from 45 to 64, and 13.7% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 95.5 males. For every 100 females age 18 and older, there were 93 males. The median income for a household in the CDP was $78,572, and the median income for a family was $85,751. Males had a median income of $60,092 versus $39,083 for females. The
per capita income for the CDP was $29,244. About 2.8% of families and 3.6% of the population were below the
poverty line, including 2.9% of those under age 18 and 3.9% of those age 65 or over. ==Parks and recreation==