Allendale is a census-designated place (CDP) in Ottawa County in the U.S. state of Michigan. The population was 17,579 at the 2010 census. It is located within Allendale Charter Township, occupying approximately the northern two-thirds of the township, from the eastern boundary with the Grand River west along Pierce St., north along 75th Ave., then west along Lake Michigan Drive (M-45) to the western boundary of the township. It is a part of the Grand Rapids-Muskegon-Holland, Michigan combined statistical area, and is an exurb of Grand Rapids, due to its major commuter routes into the city (M-45 and I-96).
According to the United States Census Bureau, the CDP has a total area of 23.7 square miles (61.4 km), of which 22.8 square miles (59.1 km) is land and 0.9 square miles (2.3 km) (3.79%) is water.
As of the census of 2000, there were 11,555 people, 2,864 households, and 1,913 families residing in the CDP. The population density was 506.1 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.
Allendale Michigan neighborhoods include: Allen Park, Arcadia Woods, Northwest Allendale, Oak View Estates / Hidden Shores