| | Marion, MS | Ellisville, MS | United States |
| Population | 1,966 | 4,544 | 329,725,481 |
| Female Population | 54.2% | 50.9% | 50.5% |
| Male Population | 45.8% | 49.1% | 49.5% |
| Median Age | 29.6 | 34.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,489 | 4,454 | 309,327,143 |
| Population - 2000 | 1,305 | 3,465 | 285,036,114 |
| Population - 1990 | 1,359 | 3,634 | 251,960,433 |
| Pop. 2000 to Now | 13.6% | 31.3% | 15.6% |
| Pop. 1990 to Now | 9.1% | 25.2% | 30.8% |
| space4 | | | |
| Population Density | 674.9 | 435.3 | 93.4 |
| Land Area | 2.9 | 10.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Marion, MS | Ellisville, MS | United States |
| Age 0 to 4 | 5.5% | 7.5% | 5.9% |
| Age 5 to 9 | 14.2% | 4.4% | 6.1% |
| Age 10 to 14 | 10.4% | 8.1% | 6.6% |
| Age 15 to 17 | 5.9% | 3.3% | 3.9% |
| Age 18 to 20 | 0.9% | 15.8% | 4.0% |
| Age 21 to 24 | 7.0% | 3.9% | 5.2% |
| Age 25 to 34 | 10.8% | 8.7% | 13.8% |
| Age 35 to 44 | 12.1% | 14.2% | 12.9% |
| Age 45 to 54 | 11.9% | 8.8% | 12.6% |
| Age 55 to 59 | 2.7% | 2.4% | 6.7% |
| Age 60 to 64 | 6.2% | 8.0% | 6.3% |
| Age 65 to 74 | 10.1% | 5.7% | 9.6% |
| Age 75 to 84 | 1.5% | 5.0% | 4.5% |
| Age 85 and over | 0.9% | 4.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Marion, MS | Ellisville, MS | United States |
| White | 30.4% | 48.2% | 59.4% |
| Black | 59.5% | 41.3% | 12.2% |
| Asian | 0.0% | 0.1% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.4% | 0.0% | 3.2% |
| Hispanic | 9.7% | 10.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Marion, MS | Ellisville, MS | United States |
| Married Population | 40.6% | 27.8% | 49.8% |
| Currently Married | 38.5% | 26.1% | 48.0% |
| Married but Separated | 2.2% | 1.8% | 1.8% |
| Single Population | 59.4% | 72.2% | 50.2% |
| Never Married | 37.7% | 52.3% | 33.8% |
| Divorced | 18.4% | 12.0% | 10.8% |
| Widowed | 3.4% | 7.9% | 5.6% |
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| Household Size | 2.85 | 2.79 | 2.60 |
| Households | 691 | 1,195 | 124,010,992 |
| Family Households | 466 | 650 | 80,755,759 |
| Married couple, w/children | 16.3% | 28.6% | 30.5% |
| Married couple, no children | 36.1% | 27.7% | 42.9% |
| Non Family Households | 225 | 545 | 43,255,233 |
| Single householder, w/children | 37.6% | 32.5% | 15.8% |
| Single householder, no children | 10.1% | 11.2% | 10.8% |