| | Welsh, LA | Prien, LA | United States |
| Population | 3,330 | 8,147 | 329,725,481 |
| Female Population | 48.0% | 51.0% | 50.5% |
| Male Population | 52.0% | 49.0% | 49.5% |
| Median Age | 36.8 | 39.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,228 | 7,148 | 309,327,143 |
| Population - 2000 | 3,380 | 7,215 | 285,036,114 |
| Population - 1990 | 3,299 | 6,448 | 251,960,433 |
| Pop. 2000 to Now | -5.5% | 11.6% | 15.6% |
| Pop. 1990 to Now | -3.2% | 24.9% | 30.8% |
| space4 | | | |
| Population Density | 526.7 | 1,402.2 | 93.4 |
| Land Area | 6.3 | 5.8 | 3,531,905.4 |
| Water Area | 0.1 | 0.6 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Welsh, LA | Prien, LA | United States |
| Age 0 to 4 | 6.5% | 10.1% | 5.9% |
| Age 5 to 9 | 4.1% | 8.6% | 6.1% |
| Age 10 to 14 | 8.3% | 6.9% | 6.6% |
| Age 15 to 17 | 9.6% | 3.6% | 3.9% |
| Age 18 to 20 | 4.9% | 1.8% | 4.0% |
| Age 21 to 24 | 4.6% | 2.6% | 5.2% |
| Age 25 to 34 | 8.9% | 9.4% | 13.8% |
| Age 35 to 44 | 10.2% | 10.9% | 12.9% |
| Age 45 to 54 | 13.8% | 13.1% | 12.6% |
| Age 55 to 59 | 10.3% | 11.4% | 6.7% |
| Age 60 to 64 | 6.8% | 9.7% | 6.3% |
| Age 65 to 74 | 5.9% | 8.1% | 9.6% |
| Age 75 to 84 | 3.0% | 2.5% | 4.5% |
| Age 85 and over | 3.0% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Welsh, LA | Prien, LA | United States |
| White | 78.0% | 83.0% | 59.4% |
| Black | 14.5% | 6.1% | 12.2% |
| Asian | 0.0% | 4.4% | 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 | 3.6% | 2.4% | 3.2% |
| Hispanic | 3.9% | 4.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Welsh, LA | Prien, LA | United States |
| Married Population | 47.4% | 68.2% | 49.8% |
| Currently Married | 46.6% | 67.9% | 48.0% |
| Married but Separated | 0.9% | 0.3% | 1.8% |
| Single Population | 52.6% | 31.8% | 50.2% |
| Never Married | 38.5% | 17.8% | 33.8% |
| Divorced | 7.6% | 5.8% | 10.8% |
| Widowed | 6.5% | 8.2% | 5.6% |
| space5 | | | |
| Household Size | 3.08 | 2.88 | 2.60 |
| Households | 1,056 | 2,823 | 124,010,992 |
| Family Households | 840 | 2,246 | 80,755,759 |
| Married couple, w/children | 34.9% | 33.3% | 30.5% |
| Married couple, no children | 37.5% | 56.7% | 42.9% |
| Non Family Households | 216 | 577 | 43,255,233 |
| Single householder, w/children | 20.8% | 6.8% | 15.8% |
| Single householder, no children | 6.8% | 3.2% | 10.8% |