| | Belmont, NH | Truckee, CA | United States |
| Population | 7,318 | 16,850 | 329,725,481 |
| Female Population | 54.6% | 49.7% | 50.5% |
| Male Population | 45.4% | 50.3% | 49.5% |
| Median Age | 48.1 | 41.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 7,335 | 16,167 | 309,327,143 |
| Population - 2000 | 6,716 | 13,864 | 285,036,114 |
| Population - 1990 | 5,796 | 3,484 | 251,960,433 |
| Pop. 2000 to Now | 8.9% | 22.5% | 15.6% |
| Pop. 1990 to Now | 26.2% | 387.4% | 30.8% |
| space4 | | | |
| Population Density | 240.2 | 521.2 | 93.4 |
| Land Area | 30.5 | 32.3 | 3,531,905.4 |
| Water Area | 1.9 | 1.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Belmont, NH | Truckee, CA | United States |
| Age 0 to 4 | 3.2% | 7.0% | 5.9% |
| Age 5 to 9 | 5.5% | 6.0% | 6.1% |
| Age 10 to 14 | 7.5% | 6.0% | 6.6% |
| Age 15 to 17 | 4.4% | 3.2% | 3.9% |
| Age 18 to 20 | 2.3% | 1.8% | 4.0% |
| Age 21 to 24 | 2.3% | 3.4% | 5.2% |
| Age 25 to 34 | 9.2% | 12.0% | 13.8% |
| Age 35 to 44 | 12.2% | 14.9% | 12.9% |
| Age 45 to 54 | 13.1% | 14.6% | 12.6% |
| Age 55 to 59 | 11.5% | 7.3% | 6.7% |
| Age 60 to 64 | 9.2% | 7.9% | 6.3% |
| Age 65 to 74 | 13.4% | 11.5% | 9.6% |
| Age 75 to 84 | 4.9% | 3.5% | 4.5% |
| Age 85 and over | 1.5% | 0.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Belmont, NH | Truckee, CA | United States |
| White | 95.4% | 83.1% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 1.4% | 1.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.4% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.5% | 2.1% | 3.2% |
| Hispanic | 1.7% | 13.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Belmont, NH | Truckee, CA | United States |
| Married Population | 62.2% | 59.3% | 49.8% |
| Currently Married | 61.6% | 58.7% | 48.0% |
| Married but Separated | 0.6% | 0.6% | 1.8% |
| Single Population | 37.8% | 40.7% | 50.2% |
| Never Married | 23.8% | 29.3% | 33.8% |
| Divorced | 9.3% | 8.9% | 10.8% |
| Widowed | 4.6% | 2.4% | 5.6% |
| space5 | | | |
| Household Size | 2.41 | 2.70 | 2.60 |
| Households | 3,035 | 6,247 | 124,010,992 |
| Family Households | 2,121 | 4,320 | 80,755,759 |
| Married couple, w/children | 29.4% | 35.6% | 30.5% |
| Married couple, no children | 58.2% | 50.8% | 42.9% |
| Non Family Households | 914 | 1,927 | 43,255,233 |
| Single householder, w/children | 10.8% | 11.2% | 15.8% |
| Single householder, no children | 1.7% | 2.5% | 10.8% |