Allendale is an unincorporated community in Ottawa County in the U.S. state of Michigan. It is also a census-designated place for statistical purposes. The population was 11,555 at the 2000 census. The community is located within Allendale Charter Township and the CDP area consists of about 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 to the western boundary of the township. Apart from the CDP definition, the community is centered at the intersection of M-45 and 68th Ave., which are the only roads which cross the Grand River in the county east of Grand Haven. It is named after Hannibel Allen, a descendant of Ethan Allen, according to the sign adjacent to a portrait painting located in Grand Valley State University's Cook-DeWitt Center. Allendale apartments for rent comparison page shows most up to date rent information on Allendale apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.