Oak Grove is an unincorporated community in Clackamas County, Oregon, United States. For statistical purposes, the United States Census Bureau has defined Oak Grove as a census-designated place. The census definition of the area may not precisely correspond to local understanding of the area with the same name. The population was 12,808 at the 2000 census. Oak Grove apartments for rent comparison page shows most up to date rent information on Oak Grove apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.