| | Sandwich, MA | Richland, WA | United States |
| Population | 20,369 | 59,718 | 329,725,481 |
| Female Population | 50.7% | 48.9% | 50.5% |
| Male Population | 49.3% | 51.2% | 49.5% |
| Median Age | 51.5 | 36.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 20,670 | 48,877 | 309,327,143 |
| Population - 2000 | 20,136 | 38,708 | 285,036,114 |
| Population - 1990 | 15,489 | 32,315 | 251,960,433 |
| Pop. 2000 to Now | 0.1% | 53.6% | 15.6% |
| Pop. 1990 to Now | 30.1% | 83.9% | 30.8% |
| space4 | | | |
| Population Density | 476.6 | 1,529.2 | 93.4 |
| Land Area | 42.7 | 39.1 | 3,531,905.4 |
| Water Area | 1.5 | 3.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Sandwich, MA | Richland, WA | United States |
| Age 0 to 4 | 3.2% | 6.2% | 5.9% |
| Age 5 to 9 | 5.3% | 7.8% | 6.1% |
| Age 10 to 14 | 5.1% | 6.6% | 6.6% |
| Age 15 to 17 | 3.7% | 4.2% | 3.9% |
| Age 18 to 20 | 4.0% | 3.1% | 4.0% |
| Age 21 to 24 | 4.1% | 5.4% | 5.2% |
| Age 25 to 34 | 6.8% | 14.8% | 13.8% |
| Age 35 to 44 | 9.8% | 13.1% | 12.9% |
| Age 45 to 54 | 13.8% | 10.7% | 12.6% |
| Age 55 to 59 | 9.3% | 6.5% | 6.7% |
| Age 60 to 64 | 9.6% | 6.1% | 6.3% |
| Age 65 to 74 | 17.8% | 8.9% | 9.6% |
| Age 75 to 84 | 5.7% | 4.8% | 4.5% |
| Age 85 and over | 1.9% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Sandwich, MA | Richland, WA | United States |
| White | 91.0% | 76.1% | 59.4% |
| Black | 1.5% | 1.5% | 12.2% |
| Asian | 2.6% | 5.7% | 5.6% |
| Native American | 0.2% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.6% | 0.5% | 0.4% |
| Two or More Races | 1.7% | 3.4% | 3.2% |
| Hispanic | 2.3% | 12.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Sandwich, MA | Richland, WA | United States |
| Married Population | 60.4% | 51.8% | 49.8% |
| Currently Married | 59.6% | 50.2% | 48.0% |
| Married but Separated | 0.8% | 1.6% | 1.8% |
| Single Population | 39.6% | 48.2% | 50.2% |
| Never Married | 24.4% | 31.3% | 33.8% |
| Divorced | 9.6% | 12.5% | 10.8% |
| Widowed | 5.6% | 4.3% | 5.6% |
| space5 | | | |
| Household Size | 2.55 | 2.55 | 2.60 |
| Households | 7,918 | 23,335 | 124,010,992 |
| Family Households | 5,678 | 14,887 | 80,755,759 |
| Married couple, w/children | 24.4% | 30.6% | 30.5% |
| Married couple, no children | 63.1% | 44.1% | 42.9% |
| Non Family Households | 2,240 | 8,448 | 43,255,233 |
| Single householder, w/children | 7.0% | 16.8% | 15.8% |
| Single householder, no children | 5.4% | 8.6% | 10.8% |