| | Londonderry, VT | Lake Placid, NY | United States |
| Population | 1,886 | 2,221 | 329,725,481 |
| Female Population | 49.4% | 56.8% | 50.5% |
| Male Population | 50.6% | 43.2% | 49.5% |
| Median Age | 53.3 | 44.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,765 | 2,525 | 309,327,143 |
| Population - 2000 | 1,709 | 2,638 | 285,036,114 |
| Population - 1990 | 1,506 | 2,485 | 251,960,433 |
| Pop. 2000 to Now | -4.1% | -10.7% | 15.6% |
| Pop. 1990 to Now | 8.8% | -5.2% | 30.8% |
| space4 | | | |
| Population Density | 53.3 | 1,620.0 | 93.4 |
| Land Area | 35.4 | 1.4 | 3,531,905.4 |
| Water Area | 0.5 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Londonderry, VT | Lake Placid, NY | United States |
| Age 0 to 4 | 1.8% | 4.4% | 5.9% |
| Age 5 to 9 | 4.9% | 5.2% | 6.1% |
| Age 10 to 14 | 3.3% | 7.0% | 6.6% |
| Age 15 to 17 | 1.2% | 1.4% | 3.9% |
| Age 18 to 20 | 0.3% | 1.5% | 4.0% |
| Age 21 to 24 | 4.0% | 6.8% | 5.2% |
| Age 25 to 34 | 8.7% | 15.9% | 13.8% |
| Age 35 to 44 | 10.3% | 10.1% | 12.9% |
| Age 45 to 54 | 18.0% | 13.6% | 12.6% |
| Age 55 to 59 | 15.9% | 8.1% | 6.7% |
| Age 60 to 64 | 11.7% | 8.9% | 6.3% |
| Age 65 to 74 | 13.0% | 12.3% | 9.6% |
| Age 75 to 84 | 5.1% | 3.9% | 4.5% |
| Age 85 and over | 1.8% | 1.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Londonderry, VT | Lake Placid, NY | United States |
| White | 96.0% | 94.0% | 59.4% |
| Black | 0.8% | 0.0% | 12.2% |
| Asian | 0.0% | 0.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.5% | 1.0% | 0.2% |
| Other | 0.0% | 1.4% | 0.4% |
| Two or More Races | 1.2% | 1.3% | 3.2% |
| Hispanic | 1.4% | 2.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Londonderry, VT | Lake Placid, NY | United States |
| Married Population | 48.0% | 40.4% | 49.8% |
| Currently Married | 46.9% | 39.6% | 48.0% |
| Married but Separated | 1.1% | 0.8% | 1.8% |
| Single Population | 52.0% | 59.6% | 50.2% |
| Never Married | 21.8% | 36.6% | 33.8% |
| Divorced | 25.8% | 19.6% | 10.8% |
| Widowed | 4.5% | 3.4% | 5.6% |
| space5 | | | |
| Household Size | 2.38 | 1.87 | 2.60 |
| Households | 792 | 1,171 | 124,010,992 |
| Family Households | 434 | 517 | 80,755,759 |
| Married couple, w/children | 20.7% | 29.0% | 30.5% |
| Married couple, no children | 67.7% | 43.3% | 42.9% |
| Non Family Households | 358 | 654 | 43,255,233 |
| Single householder, w/children | 6.5% | 20.5% | 15.8% |
| Single householder, no children | 5.1% | 7.2% | 10.8% |