| | Horn Lake, MS | Hornby, NY | United States |
| Population | 26,623 | 1,815 | 329,725,481 |
| Female Population | 53.2% | 47.9% | 50.5% |
| Male Population | 46.8% | 52.1% | 49.5% |
| Median Age | 33.8 | 40.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 26,118 | 1,696 | 309,327,143 |
| Population - 2000 | 14,099 | 1,742 | 285,036,114 |
| Population - 1990 | 9,069 | 1,655 | 251,960,433 |
| Pop. 2000 to Now | 93.5% | -6.4% | 15.6% |
| Pop. 1990 to Now | 200.8% | -1.5% | 30.8% |
| space4 | | | |
| Population Density | 1,659.1 | 44.4 | 93.4 |
| Land Area | 16.0 | 40.9 | 3,531,905.4 |
| Water Area | 0.3 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Horn Lake, MS | Hornby, NY | United States |
| Age 0 to 4 | 6.2% | 6.8% | 5.9% |
| Age 5 to 9 | 6.2% | 4.6% | 6.1% |
| Age 10 to 14 | 8.8% | 6.2% | 6.6% |
| Age 15 to 17 | 5.9% | 5.0% | 3.9% |
| Age 18 to 20 | 5.7% | 5.2% | 4.0% |
| Age 21 to 24 | 6.0% | 4.5% | 5.2% |
| Age 25 to 34 | 13.1% | 10.4% | 13.8% |
| Age 35 to 44 | 15.3% | 14.8% | 12.9% |
| Age 45 to 54 | 13.2% | 13.9% | 12.6% |
| Age 55 to 59 | 5.1% | 6.3% | 6.7% |
| Age 60 to 64 | 4.7% | 6.8% | 6.3% |
| Age 65 to 74 | 5.0% | 11.6% | 9.6% |
| Age 75 to 84 | 4.2% | 2.7% | 4.5% |
| Age 85 and over | 0.5% | 1.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Horn Lake, MS | Hornby, NY | United States |
| White | 42.1% | 95.2% | 59.4% |
| Black | 44.4% | 0.3% | 12.2% |
| Asian | 0.7% | 0.1% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 3.0% | 1.4% | 3.2% |
| Hispanic | 9.3% | 3.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Horn Lake, MS | Hornby, NY | United States |
| Married Population | 42.4% | 63.1% | 49.8% |
| Currently Married | 39.2% | 60.4% | 48.0% |
| Married but Separated | 3.1% | 2.7% | 1.8% |
| Single Population | 57.6% | 36.9% | 50.2% |
| Never Married | 39.9% | 26.5% | 33.8% |
| Divorced | 13.1% | 6.9% | 10.8% |
| Widowed | 4.6% | 3.5% | 5.6% |
| space5 | | | |
| Household Size | 2.81 | 2.89 | 2.60 |
| Households | 9,449 | 628 | 124,010,992 |
| Family Households | 6,598 | 487 | 80,755,759 |
| Married couple, w/children | 27.1% | 37.0% | 30.5% |
| Married couple, no children | 31.2% | 51.1% | 42.9% |
| Non Family Households | 2,851 | 141 | 43,255,233 |
| Single householder, w/children | 25.2% | 7.6% | 15.8% |
| Single householder, no children | 16.5% | 4.3% | 10.8% |