| | Horn Lake, MS | Southaven, MS | United States |
| Population | 26,623 | 54,141 | 329,725,481 |
| Female Population | 53.2% | 52.6% | 50.5% |
| Male Population | 46.8% | 47.4% | 49.5% |
| Median Age | 33.8 | 36.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 26,118 | 49,135 | 309,327,143 |
| Population - 2000 | 14,099 | 28,977 | 285,036,114 |
| Population - 1990 | 9,069 | 17,949 | 251,960,433 |
| Pop. 2000 to Now | 93.5% | 95.5% | 15.6% |
| Pop. 1990 to Now | 200.8% | 215.6% | 30.8% |
| space4 | | | |
| Population Density | 1,659.1 | 1,310.1 | 93.4 |
| Land Area | 16.0 | 41.3 | 3,531,905.4 |
| Water Area | 0.3 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Horn Lake, MS | Southaven, MS | United States |
| Age 0 to 4 | 6.2% | 6.0% | 5.9% |
| Age 5 to 9 | 6.2% | 6.5% | 6.1% |
| Age 10 to 14 | 8.8% | 8.4% | 6.6% |
| Age 15 to 17 | 5.9% | 5.0% | 3.9% |
| Age 18 to 20 | 5.7% | 3.8% | 4.0% |
| Age 21 to 24 | 6.0% | 5.1% | 5.2% |
| Age 25 to 34 | 13.1% | 13.5% | 13.8% |
| Age 35 to 44 | 15.3% | 13.6% | 12.9% |
| Age 45 to 54 | 13.2% | 13.2% | 12.6% |
| Age 55 to 59 | 5.1% | 6.8% | 6.7% |
| Age 60 to 64 | 4.7% | 5.0% | 6.3% |
| Age 65 to 74 | 5.0% | 8.6% | 9.6% |
| Age 75 to 84 | 4.2% | 3.7% | 4.5% |
| Age 85 and over | 0.5% | 1.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Horn Lake, MS | Southaven, MS | United States |
| White | 42.1% | 58.8% | 59.4% |
| Black | 44.4% | 32.4% | 12.2% |
| Asian | 0.7% | 1.7% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.3% | 0.4% |
| Two or More Races | 3.0% | 2.2% | 3.2% |
| Hispanic | 9.3% | 4.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Horn Lake, MS | Southaven, MS | United States |
| Married Population | 42.4% | 50.8% | 49.8% |
| Currently Married | 39.2% | 48.9% | 48.0% |
| Married but Separated | 3.1% | 1.9% | 1.8% |
| Single Population | 57.6% | 49.2% | 50.2% |
| Never Married | 39.9% | 30.4% | 33.8% |
| Divorced | 13.1% | 14.3% | 10.8% |
| Widowed | 4.6% | 4.6% | 5.6% |
| space5 | | | |
| Household Size | 2.81 | 2.63 | 2.60 |
| Households | 9,449 | 20,513 | 124,010,992 |
| Family Households | 6,598 | 14,309 | 80,755,759 |
| Married couple, w/children | 27.1% | 33.5% | 30.5% |
| Married couple, no children | 31.2% | 34.4% | 42.9% |
| Non Family Households | 2,851 | 6,204 | 43,255,233 |
| Single householder, w/children | 25.2% | 22.0% | 15.8% |
| Single householder, no children | 16.5% | 10.2% | 10.8% |