Oak Grove is an unincorporated community and census-designated place (CDP) in Clackamas County, Oregon, United States.[5] Oak Grove was named at the suggestion of Edward W. Cornell, a member of the surveying party that platted the townsite in the 1890s.[6] Postal authorities did not name the office "Oak Grove" in order to avoid duplication.Oak Grove is home to a LINCC library operated by Clackamas County.[8] Oak Grove is located in northwestern Clackamas County, bordered to the north by the city of Milwaukie, to the east by unincorporated Oatfield, to the south by unincorporated Jennings Lodge, and to the west by the Willamette River, whose opposite shore hosts the cities of West Linn and Lake Oswego.