| | Natchitoches, LA | Robeline, LA | United States |
| Population | 18,105 | 94 | 329,725,481 |
| Female Population | 53.7% | 44.7% | 50.5% |
| Male Population | 46.3% | 55.3% | 49.5% |
| Median Age | 25.9 | 38.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 18,515 | 174 | 309,327,143 |
| Population - 2000 | 17,865 | 183 | 285,036,114 |
| Population - 1990 | 16,609 | 149 | 251,960,433 |
| Pop. 2000 to Now | -3.8% | -8.2% | 15.6% |
| Pop. 1990 to Now | 3.5% | 12.8% | 30.8% |
| space4 | | | |
| Population Density | 796.5 | 79.0 | 93.4 |
| Land Area | 22.7 | 1.2 | 3,531,905.4 |
| Water Area | 3.7 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Natchitoches, LA | Robeline, LA | United States |
| Age 0 to 4 | 7.0% | 17.0% | 5.9% |
| Age 5 to 9 | 5.8% | 6.4% | 6.1% |
| Age 10 to 14 | 6.9% | 7.4% | 6.6% |
| Age 15 to 17 | 3.8% | 0.0% | 3.9% |
| Age 18 to 20 | 15.5% | 1.1% | 4.0% |
| Age 21 to 24 | 10.1% | 0.0% | 5.2% |
| Age 25 to 34 | 12.1% | 12.8% | 13.8% |
| Age 35 to 44 | 9.7% | 12.8% | 12.9% |
| Age 45 to 54 | 7.9% | 4.3% | 12.6% |
| Age 55 to 59 | 4.3% | 10.6% | 6.7% |
| Age 60 to 64 | 4.5% | 2.1% | 6.3% |
| Age 65 to 74 | 7.4% | 22.3% | 9.6% |
| Age 75 to 84 | 3.7% | 3.2% | 4.5% |
| Age 85 and over | 1.4% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Natchitoches, LA | Robeline, LA | United States |
| White | 36.2% | 84.0% | 59.4% |
| Black | 57.2% | 11.7% | 12.2% |
| Asian | 0.2% | 0.0% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.2% | 4.3% | 0.4% |
| Two or More Races | 1.7% | 0.0% | 3.2% |
| Hispanic | 3.4% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Natchitoches, LA | Robeline, LA | United States |
| Married Population | 26.6% | 60.0% | 49.8% |
| Currently Married | 24.2% | 53.8% | 48.0% |
| Married but Separated | 2.4% | 6.2% | 1.8% |
| Single Population | 73.4% | 40.0% | 50.2% |
| Never Married | 58.6% | 35.4% | 33.8% |
| Divorced | 9.2% | 4.6% | 10.8% |
| Widowed | 5.6% | 0.0% | 5.6% |
| space5 | | | |
| Household Size | 2.82 | 2.69 | 2.60 |
| Households | 5,888 | 35 | 124,010,992 |
| Family Households | 2,869 | 20 | 80,755,759 |
| Married couple, w/children | 20.5% | 30.0% | 30.5% |
| Married couple, no children | 33.0% | 45.0% | 42.9% |
| Non Family Households | 3,019 | 15 | 43,255,233 |
| Single householder, w/children | 28.6% | 25.0% | 15.8% |
| Single householder, no children | 18.0% | 0.0% | 10.8% |