| | Saddlebrooke, MO | Amherst, VA | United States |
| Population | 309 | 2,504 | 329,725,481 |
| Female Population | 50.8% | 50.4% | 50.5% |
| Male Population | 49.2% | 49.6% | 49.5% |
| Median Age | 64.6 | 51 | 38.4 |
| space3 | | | |
| Population - 2010 | 201 | 2,232 | 309,327,143 |
| Population - 2000 | 146 | 2,251 | 285,036,114 |
| Population - 1990 | 105 | 1,060 | 251,960,433 |
| Pop. 2000 to Now | 68.5% | -3.1% | 15.6% |
| Pop. 1990 to Now | 134.3% | 105.9% | 30.8% |
| space4 | | | |
| Population Density | 44.1 | 510.8 | 93.4 |
| Land Area | 7.0 | 4.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Saddlebrooke, MO | Amherst, VA | United States |
| Age 0 to 4 | 3.2% | 2.8% | 5.9% |
| Age 5 to 9 | 3.9% | 3.0% | 6.1% |
| Age 10 to 14 | 6.1% | 7.7% | 6.6% |
| Age 15 to 17 | 2.9% | 2.6% | 3.9% |
| Age 18 to 20 | 2.9% | 1.7% | 4.0% |
| Age 21 to 24 | 1.0% | 3.0% | 5.2% |
| Age 25 to 34 | 1.3% | 13.6% | 13.8% |
| Age 35 to 44 | 6.8% | 10.8% | 12.9% |
| Age 45 to 54 | 8.1% | 13.1% | 12.6% |
| Age 55 to 59 | 7.4% | 4.1% | 6.7% |
| Age 60 to 64 | 7.1% | 6.6% | 6.3% |
| Age 65 to 74 | 25.6% | 15.4% | 9.6% |
| Age 75 to 84 | 21.4% | 11.7% | 4.5% |
| Age 85 and over | 2.3% | 3.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Saddlebrooke, MO | Amherst, VA | United States |
| White | 89.0% | 70.4% | 59.4% |
| Black | 0.0% | 20.3% | 12.2% |
| Asian | 3.6% | 0.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 0.6% | 3.2% |
| Hispanic | 7.4% | 8.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Saddlebrooke, MO | Amherst, VA | United States |
| Married Population | 92.9% | 50.4% | 49.8% |
| Currently Married | 92.5% | 46.4% | 48.0% |
| Married but Separated | 0.4% | 4.1% | 1.8% |
| Single Population | 7.1% | 49.6% | 50.2% |
| Never Married | 7.1% | 23.3% | 33.8% |
| Divorced | 0.0% | 12.5% | 10.8% |
| Widowed | 0.0% | 13.8% | 5.6% |
| space5 | | | |
| Household Size | 2.43 | 2.05 | 2.60 |
| Households | 127 | 1,138 | 124,010,992 |
| Family Households | 126 | 637 | 80,755,759 |
| Married couple, w/children | 19.0% | 21.0% | 30.5% |
| Married couple, no children | 80.2% | 56.2% | 42.9% |
| Non Family Households | 1 | 501 | 43,255,233 |
| Single householder, w/children | 0.8% | 14.6% | 15.8% |
| Single householder, no children | 0.0% | 8.2% | 10.8% |