High Quality Content by WIKIPEDIA articles! Oak Grove is a city in Christian County, Kentucky, United States, adjacent to the Fort Campbell Army base. The population was 7,064 at the 2000 census. It is part of the Clarksville, TN?KY Metropolitan Statistical Area. As of the census of 2000, there were 7,064 people, 2,529 households, and 1,820 families residing in the city. The population density was 685.4 people per square mile (264.5/km²). There were 2,912 housing units at an average density of 282.5/sq mi (109.1/km²). The racial makeup of the city was 61.72% White, 25.81% African American, 1.03% Native American, 1.64% Asian, 0.51% Pacific Islander, 3.94% from other races, and 5.35% from two or more races. Hispanic or Latino of any race were 9.41% of the population.