| | Niskayuna, NY | Spring Hill, TN | United States |
| Population | 23,094 | 48,403 | 329,725,481 |
| Female Population | 51.4% | 50.7% | 50.5% |
| Male Population | 48.6% | 49.3% | 49.5% |
| Median Age | 41.9 | 35.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 21,813 | 29,309 | 309,327,143 |
| Population - 2000 | 20,295 | 7,715 | 285,036,114 |
| Population - 1990 | 19,048 | 1,464 | 251,960,433 |
| Pop. 2000 to Now | 10.0% | 498.2% | 15.6% |
| Pop. 1990 to Now | 17.2% | 3,052.5% | 30.8% |
| space4 | | | |
| Population Density | 1,632.1 | 1,807.0 | 93.4 |
| Land Area | 14.2 | 26.8 | 3,531,905.4 |
| Water Area | 0.9 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Niskayuna, NY | Spring Hill, TN | United States |
| Age 0 to 4 | 6.3% | 7.4% | 5.9% |
| Age 5 to 9 | 8.5% | 11.4% | 6.1% |
| Age 10 to 14 | 6.8% | 8.1% | 6.6% |
| Age 15 to 17 | 4.5% | 3.4% | 3.9% |
| Age 18 to 20 | 1.7% | 4.1% | 4.0% |
| Age 21 to 24 | 2.4% | 2.6% | 5.2% |
| Age 25 to 34 | 8.9% | 12.6% | 13.8% |
| Age 35 to 44 | 14.7% | 18.9% | 12.9% |
| Age 45 to 54 | 14.4% | 11.8% | 12.6% |
| Age 55 to 59 | 5.7% | 4.6% | 6.7% |
| Age 60 to 64 | 7.6% | 4.5% | 6.3% |
| Age 65 to 74 | 11.1% | 7.1% | 9.6% |
| Age 75 to 84 | 4.9% | 2.9% | 4.5% |
| Age 85 and over | 2.6% | 0.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Niskayuna, NY | Spring Hill, TN | United States |
| White | 78.3% | 84.6% | 59.4% |
| Black | 3.2% | 4.8% | 12.2% |
| Asian | 11.0% | 1.3% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.5% | 0.0% | 0.4% |
| Two or More Races | 2.9% | 2.9% | 3.2% |
| Hispanic | 4.2% | 6.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Niskayuna, NY | Spring Hill, TN | United States |
| Married Population | 61.5% | 66.0% | 49.8% |
| Currently Married | 59.7% | 65.5% | 48.0% |
| Married but Separated | 1.8% | 0.5% | 1.8% |
| Single Population | 38.5% | 34.0% | 50.2% |
| Never Married | 24.6% | 23.6% | 33.8% |
| Divorced | 9.1% | 7.2% | 10.8% |
| Widowed | 4.9% | 3.3% | 5.6% |
| space5 | | | |
| Household Size | 2.70 | 2.85 | 2.60 |
| Households | 8,413 | 16,942 | 124,010,992 |
| Family Households | 5,900 | 13,649 | 80,755,759 |
| Married couple, w/children | 41.0% | 44.0% | 30.5% |
| Married couple, no children | 46.1% | 38.6% | 42.9% |
| Non Family Households | 2,513 | 3,293 | 43,255,233 |
| Single householder, w/children | 7.5% | 11.5% | 15.8% |
| Single householder, no children | 5.4% | 5.8% | 10.8% |