| | Vivian, LA | Plain Dealing, LA | United States |
| Population | 3,153 | 850 | 329,725,481 |
| Female Population | 49.6% | 46.7% | 50.5% |
| Male Population | 50.4% | 53.3% | 49.5% |
| Median Age | 33.8 | 53.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,693 | 1,020 | 309,327,143 |
| Population - 2000 | 4,031 | 1,071 | 285,036,114 |
| Population - 1990 | 4,156 | 1,074 | 251,960,433 |
| Pop. 2000 to Now | -14.6% | -12.7% | 15.6% |
| Pop. 1990 to Now | -17.2% | -12.9% | 30.8% |
| space4 | | | |
| Population Density | 573.2 | 538.3 | 93.4 |
| Land Area | 5.5 | 1.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Vivian, LA | Plain Dealing, LA | United States |
| Age 0 to 4 | 6.5% | 2.8% | 5.9% |
| Age 5 to 9 | 9.8% | 0.0% | 6.1% |
| Age 10 to 14 | 7.4% | 4.9% | 6.6% |
| Age 15 to 17 | 3.0% | 1.5% | 3.9% |
| Age 18 to 20 | 1.0% | 0.6% | 4.0% |
| Age 21 to 24 | 3.3% | 13.3% | 5.2% |
| Age 25 to 34 | 19.7% | 3.2% | 13.8% |
| Age 35 to 44 | 8.6% | 8.2% | 12.9% |
| Age 45 to 54 | 4.9% | 18.4% | 12.6% |
| Age 55 to 59 | 12.1% | 11.6% | 6.7% |
| Age 60 to 64 | 7.6% | 8.2% | 6.3% |
| Age 65 to 74 | 9.6% | 19.2% | 9.6% |
| Age 75 to 84 | 5.7% | 2.9% | 4.5% |
| Age 85 and over | 0.6% | 5.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Vivian, LA | Plain Dealing, LA | United States |
| White | 63.3% | 60.1% | 59.4% |
| Black | 35.0% | 35.9% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 1.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.8% | 0.0% | 3.2% |
| Hispanic | 0.9% | 2.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Vivian, LA | Plain Dealing, LA | United States |
| Married Population | 29.3% | 39.8% | 49.8% |
| Currently Married | 26.5% | 37.8% | 48.0% |
| Married but Separated | 2.7% | 2.0% | 1.8% |
| Single Population | 70.7% | 60.2% | 50.2% |
| Never Married | 39.0% | 31.9% | 33.8% |
| Divorced | 22.5% | 19.1% | 10.8% |
| Widowed | 9.2% | 9.2% | 5.6% |
| space5 | | | |
| Household Size | 2.13 | 2.17 | 2.60 |
| Households | 1,477 | 372 | 124,010,992 |
| Family Households | 706 | 193 | 80,755,759 |
| Married couple, w/children | 14.6% | 18.7% | 30.5% |
| Married couple, no children | 25.1% | 41.5% | 42.9% |
| Non Family Households | 771 | 179 | 43,255,233 |
| Single householder, w/children | 46.0% | 13.5% | 15.8% |
| Single householder, no children | 14.3% | 26.4% | 10.8% |