| | Selma, NC | Mount Olive, NC | United States |
| Population | 6,317 | 4,155 | 329,725,481 |
| Female Population | 60.0% | 50.6% | 50.5% |
| Male Population | 40.0% | 49.4% | 49.5% |
| Median Age | 33.4 | 42.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 6,136 | 4,621 | 309,327,143 |
| Population - 2000 | 5,914 | 4,567 | 285,036,114 |
| Population - 1990 | 4,600 | 4,582 | 251,960,433 |
| Pop. 2000 to Now | 23.8% | 2.1% | 15.6% |
| Pop. 1990 to Now | 59.2% | 1.7% | 30.8% |
| space4 | | | |
| Population Density | 1,312.8 | 1,480.8 | 93.4 |
| Land Area | 4.8 | 2.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Selma, NC | Mount Olive, NC | United States |
| Age 0 to 4 | 6.0% | 0.9% | 5.9% |
| Age 5 to 9 | 5.8% | 5.5% | 6.1% |
| Age 10 to 14 | 10.5% | 3.5% | 6.6% |
| Age 15 to 17 | 6.3% | 5.3% | 3.9% |
| Age 18 to 20 | 2.7% | 10.9% | 4.0% |
| Age 21 to 24 | 7.7% | 6.9% | 5.2% |
| Age 25 to 34 | 15.2% | 9.4% | 13.8% |
| Age 35 to 44 | 14.4% | 9.6% | 12.9% |
| Age 45 to 54 | 10.8% | 10.5% | 12.6% |
| Age 55 to 59 | 3.2% | 7.9% | 6.7% |
| Age 60 to 64 | 3.3% | 7.7% | 6.3% |
| Age 65 to 74 | 8.8% | 10.5% | 9.6% |
| Age 75 to 84 | 3.0% | 7.5% | 4.5% |
| Age 85 and over | 2.3% | 3.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Selma, NC | Mount Olive, NC | United States |
| White | 25.0% | 40.6% | 59.4% |
| Black | 41.1% | 49.7% | 12.2% |
| Asian | 0.0% | 0.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.3% | 0.4% |
| Two or More Races | 1.0% | 2.6% | 3.2% |
| Hispanic | 32.7% | 6.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Selma, NC | Mount Olive, NC | United States |
| Married Population | 37.3% | 28.7% | 49.8% |
| Currently Married | 34.5% | 25.8% | 48.0% |
| Married but Separated | 2.9% | 2.9% | 1.8% |
| Single Population | 62.7% | 71.3% | 50.2% |
| Never Married | 45.2% | 45.3% | 33.8% |
| Divorced | 11.5% | 16.0% | 10.8% |
| Widowed | 6.0% | 10.0% | 5.6% |
| space5 | | | |
| Household Size | 2.46 | 2.18 | 2.60 |
| Households | 2,565 | 1,662 | 124,010,992 |
| Family Households | 1,425 | 851 | 80,755,759 |
| Married couple, w/children | 29.3% | 16.0% | 30.5% |
| Married couple, no children | 20.9% | 25.7% | 42.9% |
| Non Family Households | 1,140 | 811 | 43,255,233 |
| Single householder, w/children | 30.7% | 31.4% | 15.8% |
| Single householder, no children | 19.0% | 26.9% | 10.8% |