2020 census
As of the 2020 census, Oak Grove had a population of 17,290. The median age was 45.0 years. 16.6% of residents were under the age of 18 and 24.7% of residents were 65 years of age or older. For every 100 females there were 93.8 males, and for every 100 females age 18 and over there were 91.2 males age 18 and over.[11][12]
100.0% of residents lived in urban areas, while 0.0% lived in rural areas.[13]
There were 7,276 households in Oak Grove, of which 21.8% had children under the age of 18 living in them. Of all households, 43.9% were married-couple households, 19.3% were households with a male householder and no spouse or partner present, and 28.0% were households with a female householder and no spouse or partner present. About 29.9% of all households were made up of individuals and 16.1% had someone living alone who was 65 years of age or older.[11]
There were 7,635 housing units, of which 4.7% were vacant. The homeowner vacancy rate was 0.9% and the rental vacancy rate was 5.4%.[11]
2000 census
As of the census[4] of 2000, there were 12,808 people, 5,641 households, and 3,249 families residing in the CDP. The population density was 4,379.6 inhabitants per square mile (1,691.0/km2). There were 6,015 housing units at an average density of 2,056.8 per square mile (794.1/km2). The racial makeup of the CDP was 91.47% White, 0.56% African American, 0.78% Native American, 1.79% Asian, 0.10% Pacific Islander, 2.55% from other races, and 2.75% from two or more races. Hispanic or Latino of any race were 5.89% of the population.
There were 5,641 households, out of which 24.7% had children under the age of 18 living with them, 43.9% were married couples living together, 9.9% had a female householder with no husband present, and 42.4% were non-families. 35.2% of all households were made up of individuals, and 18.8% had someone living alone who was 65 years of age or older. The average household size was 2.24 and the average family size was 2.89.
In the CDP, the population was spread out, with 21.5% under the age of 18, 7.5% from 18 to 24, 27.5% from 25 to 44, 23.3% from 45 to 64, and 20.2% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 89.0 males. For every 100 females age 18 and over, there were 85.8 males.
The median income for a household in the CDP was $40,530, and the median income for a family was $49,141. Males had a median income of $36,867 versus $29,877 for females. The per capita income for the CDP was $22,643. About 6.6% of families and 8.8% of the population were below the poverty line, including 14.1% of those under age 18 and 7.0% of those age 65 or over.
