| | Cassville, MO | Seminary, MS | United States |
| Population | 3,182 | 236 | 329,725,481 |
| Female Population | 51.5% | 47.5% | 50.5% |
| Male Population | 48.5% | 52.5% | 49.5% |
| Median Age | 41.3 | 34.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,195 | 315 | 309,327,143 |
| Population - 2000 | 2,890 | 335 | 285,036,114 |
| Population - 1990 | 2,371 | 231 | 251,960,433 |
| Pop. 2000 to Now | 11.4% | -15.2% | 15.6% |
| Pop. 1990 to Now | 35.8% | 22.9% | 30.8% |
| space4 | | | |
| Population Density | 929.6 | 156.2 | 93.4 |
| Land Area | 3.4 | 1.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Cassville, MO | Seminary, MS | United States |
| Age 0 to 4 | 10.1% | 14.8% | 5.9% |
| Age 5 to 9 | 4.2% | 7.6% | 6.1% |
| Age 10 to 14 | 3.9% | 2.1% | 6.6% |
| Age 15 to 17 | 3.8% | 3.8% | 3.9% |
| Age 18 to 20 | 4.1% | 4.7% | 4.0% |
| Age 21 to 24 | 4.0% | 4.2% | 5.2% |
| Age 25 to 34 | 10.0% | 14.0% | 13.8% |
| Age 35 to 44 | 15.3% | 12.3% | 12.9% |
| Age 45 to 54 | 9.0% | 15.3% | 12.6% |
| Age 55 to 59 | 6.6% | 2.5% | 6.7% |
| Age 60 to 64 | 5.6% | 4.7% | 6.3% |
| Age 65 to 74 | 13.8% | 6.8% | 9.6% |
| Age 75 to 84 | 7.1% | 3.0% | 4.5% |
| Age 85 and over | 2.6% | 4.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Cassville, MO | Seminary, MS | United States |
| White | 92.5% | 89.0% | 59.4% |
| Black | 2.1% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.3% | 0.4% |
| Two or More Races | 2.6% | 0.0% | 3.2% |
| Hispanic | 2.7% | 9.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Cassville, MO | Seminary, MS | United States |
| Married Population | 44.3% | 45.5% | 49.8% |
| Currently Married | 44.2% | 45.5% | 48.0% |
| Married but Separated | 0.2% | 0.0% | 1.8% |
| Single Population | 55.7% | 54.5% | 50.2% |
| Never Married | 24.3% | 25.8% | 33.8% |
| Divorced | 17.5% | 22.5% | 10.8% |
| Widowed | 13.9% | 6.2% | 5.6% |
| space5 | | | |
| Household Size | 2.48 | 2.46 | 2.60 |
| Households | 1,242 | 96 | 124,010,992 |
| Family Households | 796 | 55 | 80,755,759 |
| Married couple, w/children | 22.0% | 47.3% | 30.5% |
| Married couple, no children | 42.3% | 27.3% | 42.9% |
| Non Family Households | 446 | 41 | 43,255,233 |
| Single householder, w/children | 23.4% | 12.7% | 15.8% |
| Single householder, no children | 12.3% | 12.7% | 10.8% |