Oak Grove, LA has a population of 1,538 and is the 12,532nd largest city in the United States. The population density is 895 per sq mi which is 909% higher than the Louisiana average and 888% higher than the national average. The median age in Oak Grove is 42 which is approximately 16% higher than the Louisiana average of 36. In Oak Grove, 57% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 75% of Oak Grove residents were born in Louisiana, 25% were born out of state, 0% were born outside of the United States and 0% were foreign born.