| | Watson, LA | Killian, LA | United States |
| Population | 965 | 1,175 | 329,725,481 |
| Female Population | 45.6% | 56.8% | 50.5% |
| Male Population | 54.4% | 43.2% | 49.5% |
| Median Age | 49.5 | 52.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,444 | 1,199 | 309,327,143 |
| Population - 2000 | 600 | 1,053 | 285,036,114 |
| Population - 1990 | 336 | 721 | 251,960,433 |
| Pop. 2000 to Now | 92.0% | 27.0% | 15.6% |
| Pop. 1990 to Now | 242.9% | 85.4% | 30.8% |
| space4 | | | |
| Population Density | 1,006.3 | 108.0 | 93.4 |
| Land Area | 1.0 | 10.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Watson, LA | Killian, LA | United States |
| Age 0 to 4 | 3.8% | 2.0% | 5.9% |
| Age 5 to 9 | 0.2% | 5.3% | 6.1% |
| Age 10 to 14 | 5.6% | 7.1% | 6.6% |
| Age 15 to 17 | 6.4% | 4.4% | 3.9% |
| Age 18 to 20 | 2.3% | 0.0% | 4.0% |
| Age 21 to 24 | 17.5% | 4.9% | 5.2% |
| Age 25 to 34 | 6.8% | 12.9% | 13.8% |
| Age 35 to 44 | 6.1% | 6.3% | 12.9% |
| Age 45 to 54 | 10.9% | 11.4% | 12.6% |
| Age 55 to 59 | 2.6% | 12.8% | 6.7% |
| Age 60 to 64 | 25.4% | 7.7% | 6.3% |
| Age 65 to 74 | 10.8% | 15.9% | 9.6% |
| Age 75 to 84 | 0.0% | 2.6% | 4.5% |
| Age 85 and over | 1.6% | 6.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Watson, LA | Killian, LA | United States |
| White | 97.1% | 88.1% | 59.4% |
| Black | 0.0% | 5.5% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.3% | 0.4% |
| Two or More Races | 0.0% | 2.1% | 3.2% |
| Hispanic | 2.9% | 3.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Watson, LA | Killian, LA | United States |
| Married Population | 45.4% | 60.6% | 49.8% |
| Currently Married | 42.0% | 59.8% | 48.0% |
| Married but Separated | 3.4% | 0.8% | 1.8% |
| Single Population | 54.6% | 39.4% | 50.2% |
| Never Married | 29.0% | 18.7% | 33.8% |
| Divorced | 17.4% | 9.0% | 10.8% |
| Widowed | 8.1% | 11.7% | 5.6% |
| space5 | | | |
| Household Size | 2.72 | 2.12 | 2.60 |
| Households | 355 | 555 | 124,010,992 |
| Family Households | 206 | 378 | 80,755,759 |
| Married couple, w/children | 42.7% | 23.3% | 30.5% |
| Married couple, no children | 45.6% | 60.6% | 42.9% |
| Non Family Households | 149 | 177 | 43,255,233 |
| Single householder, w/children | 0.0% | 15.6% | 15.8% |
| Single householder, no children | 11.7% | 0.5% | 10.8% |