2020 census
As of the 2020 census, Allendale had a population of 27,073. The median age was 21.3 years. 15.3% of residents were under the age of 18 and 4.9% of residents were 65 years of age or older. For every 100 females there were 82.7 males, and for every 100 females age 18 and over there were 80.3 males age 18 and over.[9][10]
89.1% of residents lived in urban areas, while 10.9% lived in rural areas.[11]
There were 8,114 households in Allendale, of which 24.7% had children under the age of 18 living in them. Of all households, 34.1% were married-couple households, 26.1% were households with a male householder and no spouse or partner present, and 34.3% were households with a female householder and no spouse or partner present. About 24.0% of all households were made up of individuals and 3.0% had someone living alone who was 65 years of age or older.[9]
There were 8,624 housing units, of which 5.9% were vacant. The homeowner vacancy rate was 1.1% and the rental vacancy rate was 6.0%.[9]
2000 census
As of the census[3] of 2000, there were 11,555 people, 2,864 households, and 1,913 families residing in the CDP. The population density was 506.1 inhabitants per square mile (195.4/km2). There were 3,016 housing units at an average density of 132.1 per square mile (51.0/km2). The racial makeup of the CDP was 93.22% White, 2.97% African American, 0.34% Native American, 0.89% Asian, 0.08% Pacific Islander, 1.45% from other races, and 1.06% from two or more races. Hispanic or Latino of any race were 3.03% of the population.
There were 2,864 households, out of which 38.5% had children under the age of 18 living with them, 57.8% were married couples living together, 6.3% had a female householder with no husband present, and 33.2% were non-families. 16.1% of all households were made up of individuals, and 3.5% had someone living alone who was 65 years of age or older. The average household size was 2.98 and the average family size was 3.36.
In the CDP the population was spread out, with 20.7% under the age of 18, 43.1% from 18 to 24, 22.1% from 25 to 44, 9.6% from 45 to 64, and 4.6% who were 65 years of age or older. The median age was 21 years. For every 100 females, there were 87.3 males. For every 100 females age 18 and over, there were 83.6 males.
The median income for a household in the CDP was $46,671, and the median income for a family was $58,371. Males had a median income of $39,038 versus $25,146 for females. The per capita income for the community was $14,580. About 2.4% of families and 12.5% of the population were below the poverty line, including 2.5% of those under age 18 and 3.6% of those age 65 or over.
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