| | Union, LA | Walker, LA | United States |
| Population | 491 | 6,322 | 329,725,481 |
| Female Population | 53.8% | 48.0% | 50.5% |
| Male Population | 46.2% | 52.0% | 49.5% |
| Median Age | 51.9 | 35.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 741 | 6,082 | 309,327,143 |
| Population - 2000 | 1,122 | 4,801 | 285,036,114 |
| Population - 1990 | 1,136 | 3,727 | 251,960,433 |
| Pop. 2000 to Now | -46.3% | 31.3% | 15.6% |
| Pop. 1990 to Now | -46.9% | 69.1% | 30.8% |
| space4 | | | |
| Population Density | 51.7 | 968.2 | 93.4 |
| Land Area | 9.5 | 6.5 | 3,531,905.4 |
| Water Area | 1.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Union, LA | Walker, LA | United States |
| Age 0 to 4 | 3.9% | 4.4% | 5.9% |
| Age 5 to 9 | 7.1% | 9.1% | 6.1% |
| Age 10 to 14 | 3.3% | 9.9% | 6.6% |
| Age 15 to 17 | 4.3% | 3.1% | 3.9% |
| Age 18 to 20 | 3.9% | 3.0% | 4.0% |
| Age 21 to 24 | 0.0% | 3.5% | 5.2% |
| Age 25 to 34 | 9.4% | 14.6% | 13.8% |
| Age 35 to 44 | 9.6% | 15.7% | 12.9% |
| Age 45 to 54 | 28.7% | 11.8% | 12.6% |
| Age 55 to 59 | 6.1% | 2.3% | 6.7% |
| Age 60 to 64 | 7.3% | 6.2% | 6.3% |
| Age 65 to 74 | 9.0% | 11.1% | 9.6% |
| Age 75 to 84 | 7.5% | 3.0% | 4.5% |
| Age 85 and over | 0.0% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Union, LA | Walker, LA | United States |
| White | 20.0% | 81.8% | 59.4% |
| Black | 79.6% | 10.3% | 12.2% |
| Asian | 0.0% | 6.5% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 0.6% | 3.2% |
| Hispanic | 0.4% | 0.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Union, LA | Walker, LA | United States |
| Married Population | 54.6% | 43.8% | 49.8% |
| Currently Married | 49.2% | 40.8% | 48.0% |
| Married but Separated | 5.5% | 3.0% | 1.8% |
| Single Population | 45.4% | 56.2% | 50.2% |
| Never Married | 37.1% | 29.1% | 33.8% |
| Divorced | 2.6% | 21.2% | 10.8% |
| Widowed | 5.7% | 6.0% | 5.6% |
| space5 | | | |
| Household Size | 2.41 | 2.71 | 2.60 |
| Households | 204 | 2,333 | 124,010,992 |
| Family Households | 149 | 1,441 | 80,755,759 |
| Married couple, w/children | 22.8% | 39.8% | 30.5% |
| Married couple, no children | 42.3% | 26.6% | 42.9% |
| Non Family Households | 55 | 892 | 43,255,233 |
| Single householder, w/children | 15.4% | 17.8% | 15.8% |
| Single householder, no children | 19.5% | 15.7% | 10.8% |