| | Marion, LA | Bernice, LA | United States |
| Population | 679 | 1,182 | 329,725,481 |
| Female Population | 65.1% | 52.5% | 50.5% |
| Male Population | 34.9% | 47.6% | 49.5% |
| Median Age | 52.9 | 47.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 768 | 1,697 | 309,327,143 |
| Population - 2000 | 806 | 1,809 | 285,036,114 |
| Population - 1990 | 775 | 1,543 | 251,960,433 |
| Pop. 2000 to Now | -8.2% | -12.1% | 15.6% |
| Pop. 1990 to Now | -4.5% | 3.1% | 30.8% |
| space4 | | | |
| Population Density | 211.5 | 366.4 | 93.4 |
| Land Area | 3.2 | 3.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Marion, LA | Bernice, LA | United States |
| Age 0 to 4 | 4.3% | 9.1% | 5.9% |
| Age 5 to 9 | 2.1% | 4.7% | 6.1% |
| Age 10 to 14 | 5.3% | 7.7% | 6.6% |
| Age 15 to 17 | 2.9% | 3.8% | 3.9% |
| Age 18 to 20 | 14.1% | 4.4% | 4.0% |
| Age 21 to 24 | 3.2% | 1.2% | 5.2% |
| Age 25 to 34 | 2.8% | 5.1% | 13.8% |
| Age 35 to 44 | 6.3% | 11.3% | 12.9% |
| Age 45 to 54 | 10.6% | 15.3% | 12.6% |
| Age 55 to 59 | 5.7% | 11.8% | 6.7% |
| Age 60 to 64 | 8.1% | 12.0% | 6.3% |
| Age 65 to 74 | 19.1% | 9.1% | 9.6% |
| Age 75 to 84 | 13.4% | 4.1% | 4.5% |
| Age 85 and over | 1.9% | 0.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Marion, LA | Bernice, LA | United States |
| White | 26.5% | 22.1% | 59.4% |
| Black | 62.7% | 61.3% | 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% | 0.0% | 0.4% |
| Two or More Races | 8.0% | 0.1% | 3.2% |
| Hispanic | 2.8% | 16.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Marion, LA | Bernice, LA | United States |
| Married Population | 36.0% | 33.2% | 49.8% |
| Currently Married | 26.5% | 29.7% | 48.0% |
| Married but Separated | 9.5% | 3.4% | 1.8% |
| Single Population | 64.0% | 66.8% | 50.2% |
| Never Married | 38.7% | 43.5% | 33.8% |
| Divorced | 8.0% | 12.2% | 10.8% |
| Widowed | 17.3% | 11.1% | 5.6% |
| space5 | | | |
| Household Size | 2.16 | 2.27 | 2.60 |
| Households | 315 | 519 | 124,010,992 |
| Family Households | 138 | 224 | 80,755,759 |
| Married couple, w/children | 2.2% | 12.5% | 30.5% |
| Married couple, no children | 42.8% | 41.5% | 42.9% |
| Non Family Households | 177 | 295 | 43,255,233 |
| Single householder, w/children | 20.3% | 17.4% | 15.8% |
| Single householder, no children | 34.8% | 28.6% | 10.8% |