| | Fort Hill, OR | Chelsea, MA | United States |
| Population | 113 | 40,025 | 329,725,481 |
| Female Population | 69.9% | 48.8% | 50.5% |
| Male Population | 30.1% | 51.3% | 49.5% |
| Median Age | 57.9 | 33.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 84 | 35,344 | 309,327,143 |
| Population - 2000 | 125 | 35,080 | 285,036,114 |
| Population - 1990 | 94 | 28,710 | 251,960,433 |
| Pop. 2000 to Now | 5.6% | 11.8% | 15.6% |
| Pop. 1990 to Now | 40.4% | 36.6% | 30.8% |
| space4 | | | |
| Population Density | 78.8 | 18,070.0 | 93.4 |
| Land Area | 1.4 | 2.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Fort Hill, OR | Chelsea, MA | United States |
| Age 0 to 4 | 0.0% | 8.5% | 5.9% |
| Age 5 to 9 | 0.0% | 5.5% | 6.1% |
| Age 10 to 14 | 0.0% | 7.2% | 6.6% |
| Age 15 to 17 | 0.0% | 4.1% | 3.9% |
| Age 18 to 20 | 0.0% | 3.5% | 4.0% |
| Age 21 to 24 | 0.0% | 4.9% | 5.2% |
| Age 25 to 34 | 0.0% | 18.9% | 13.8% |
| Age 35 to 44 | 0.0% | 15.8% | 12.9% |
| Age 45 to 54 | 0.0% | 11.7% | 12.6% |
| Age 55 to 59 | 56.6% | 5.3% | 6.7% |
| Age 60 to 64 | 0.0% | 5.1% | 6.3% |
| Age 65 to 74 | 0.0% | 5.4% | 9.6% |
| Age 75 to 84 | 43.4% | 2.5% | 4.5% |
| Age 85 and over | 0.0% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Fort Hill, OR | Chelsea, MA | United States |
| White | 30.1% | 19.7% | 59.4% |
| Black | 0.0% | 7.0% | 12.2% |
| Asian | 0.0% | 3.5% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 69.9% | 3.3% | 3.2% |
| Hispanic | 0.0% | 66.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Fort Hill, OR | Chelsea, MA | United States |
| Married Population | 28.3% | 41.5% | 49.8% |
| Currently Married | 28.3% | 36.9% | 48.0% |
| Married but Separated | 0.0% | 4.6% | 1.8% |
| Single Population | 71.7% | 58.5% | 50.2% |
| Never Married | 0.0% | 44.7% | 33.8% |
| Divorced | 56.6% | 8.4% | 10.8% |
| Widowed | 15.0% | 5.5% | 5.6% |
| space5 | | | |
| Household Size | 1.15 | 2.94 | 2.60 |
| Households | 98 | 13,353 | 124,010,992 |
| Family Households | 17 | 7,470 | 80,755,759 |
| Married couple, w/children | 0.0% | 34.0% | 30.5% |
| Married couple, no children | 100.0% | 26.6% | 42.9% |
| Non Family Households | 81 | 5,883 | 43,255,233 |
| Single householder, w/children | 0.0% | 25.3% | 15.8% |
| Single householder, no children | 0.0% | 14.1% | 10.8% |