| | Leonard, ND | Malverne, NY | United States |
| Population | 255 | 8,583 | 329,725,481 |
| Female Population | 51.8% | 51.7% | 50.5% |
| Male Population | 48.2% | 48.3% | 49.5% |
| Median Age | 47.1 | 44.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 225 | 8,529 | 309,327,143 |
| Population - 2000 | 255 | 8,934 | 285,036,114 |
| Population - 1990 | 310 | 9,054 | 251,960,433 |
| Pop. 2000 to Now | -10.2% | -5.3% | 15.6% |
| Pop. 1990 to Now | -26.1% | -6.6% | 30.8% |
| space4 | | | |
| Population Density | 339.6 | 8,112.5 | 93.4 |
| Land Area | 0.8 | 1.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Leonard, ND | Malverne, NY | United States |
| Age 0 to 4 | 5.9% | 6.9% | 5.9% |
| Age 5 to 9 | 4.7% | 4.3% | 6.1% |
| Age 10 to 14 | 9.8% | 5.2% | 6.6% |
| Age 15 to 17 | 0.8% | 3.0% | 3.9% |
| Age 18 to 20 | 2.0% | 2.8% | 4.0% |
| Age 21 to 24 | 1.6% | 3.7% | 5.2% |
| Age 25 to 34 | 13.3% | 9.9% | 13.8% |
| Age 35 to 44 | 9.4% | 14.6% | 12.9% |
| Age 45 to 54 | 19.2% | 12.7% | 12.6% |
| Age 55 to 59 | 11.0% | 8.1% | 6.7% |
| Age 60 to 64 | 5.5% | 8.8% | 6.3% |
| Age 65 to 74 | 12.2% | 13.0% | 9.6% |
| Age 75 to 84 | 3.9% | 4.0% | 4.5% |
| Age 85 and over | 0.8% | 3.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Leonard, ND | Malverne, NY | United States |
| White | 98.0% | 76.0% | 59.4% |
| Black | 0.0% | 4.3% | 12.2% |
| Asian | 0.0% | 3.5% | 5.6% |
| Native American | 0.4% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.8% | 0.6% | 0.4% |
| Two or More Races | 0.8% | 3.3% | 3.2% |
| Hispanic | 0.0% | 12.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Leonard, ND | Malverne, NY | United States |
| Married Population | 69.5% | 63.6% | 49.8% |
| Currently Married | 68.5% | 62.6% | 48.0% |
| Married but Separated | 1.0% | 1.0% | 1.8% |
| Single Population | 30.5% | 36.4% | 50.2% |
| Never Married | 15.3% | 24.4% | 33.8% |
| Divorced | 7.4% | 5.0% | 10.8% |
| Widowed | 7.9% | 7.0% | 5.6% |
| space5 | | | |
| Household Size | 2.38 | 2.85 | 2.60 |
| Households | 107 | 3,013 | 124,010,992 |
| Family Households | 71 | 2,384 | 80,755,759 |
| Married couple, w/children | 40.8% | 32.2% | 30.5% |
| Married couple, no children | 50.7% | 51.1% | 42.9% |
| Non Family Households | 36 | 629 | 43,255,233 |
| Single householder, w/children | 2.8% | 5.7% | 15.8% |
| Single householder, no children | 5.6% | 11.1% | 10.8% |