| | Oak Grove, LA | Delhi, LA | United States |
| Population | 1,593 | 2,648 | 329,725,481 |
| Female Population | 47.8% | 48.4% | 50.5% |
| Male Population | 52.2% | 51.6% | 49.5% |
| Median Age | 49.3 | 41.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,718 | 2,942 | 309,327,143 |
| Population - 2000 | 2,174 | 3,066 | 285,036,114 |
| Population - 1990 | 2,126 | 3,169 | 251,960,433 |
| Pop. 2000 to Now | -30.2% | -10.2% | 15.6% |
| Pop. 1990 to Now | -28.6% | -13.1% | 30.8% |
| space4 | | | |
| Population Density | 926.7 | 922.0 | 93.4 |
| Land Area | 1.7 | 2.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Oak Grove, LA | Delhi, LA | United States |
| Age 0 to 4 | 4.1% | 3.7% | 5.9% |
| Age 5 to 9 | 5.7% | 6.9% | 6.1% |
| Age 10 to 14 | 2.7% | 8.0% | 6.6% |
| Age 15 to 17 | 3.5% | 3.4% | 3.9% |
| Age 18 to 20 | 8.0% | 5.1% | 4.0% |
| Age 21 to 24 | 6.0% | 1.4% | 5.2% |
| Age 25 to 34 | 5.8% | 15.0% | 13.8% |
| Age 35 to 44 | 9.7% | 14.5% | 12.9% |
| Age 45 to 54 | 20.5% | 9.7% | 12.6% |
| Age 55 to 59 | 8.8% | 11.9% | 6.7% |
| Age 60 to 64 | 6.5% | 4.5% | 6.3% |
| Age 65 to 74 | 8.0% | 7.7% | 9.6% |
| Age 75 to 84 | 8.3% | 6.1% | 4.5% |
| Age 85 and over | 2.3% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Oak Grove, LA | Delhi, LA | United States |
| White | 60.5% | 40.3% | 59.4% |
| Black | 37.9% | 55.6% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.9% | 0.6% |
| Hawaiian, Pacific Islander | 0.4% | 0.0% | 0.2% |
| Other | 0.8% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 1.3% | 3.2% |
| Hispanic | 0.5% | 2.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Oak Grove, LA | Delhi, LA | United States |
| Married Population | 39.6% | 37.2% | 49.8% |
| Currently Married | 38.1% | 35.6% | 48.0% |
| Married but Separated | 1.5% | 1.6% | 1.8% |
| Single Population | 60.4% | 62.8% | 50.2% |
| Never Married | 38.5% | 44.3% | 33.8% |
| Divorced | 10.0% | 12.1% | 10.8% |
| Widowed | 12.0% | 6.4% | 5.6% |
| space5 | | | |
| Household Size | 2.46 | 2.64 | 2.60 |
| Households | 627 | 987 | 124,010,992 |
| Family Households | 371 | 635 | 80,755,759 |
| Married couple, w/children | 12.4% | 15.3% | 30.5% |
| Married couple, no children | 53.9% | 36.5% | 42.9% |
| Non Family Households | 256 | 352 | 43,255,233 |
| Single householder, w/children | 19.7% | 35.0% | 15.8% |
| Single householder, no children | 14.0% | 13.2% | 10.8% |