| | Fox Island, WA | Signal Mountain, TN | United States |
| Population | 3,534 | 8,770 | 329,725,481 |
| Female Population | 49.3% | 51.8% | 50.5% |
| Male Population | 50.7% | 48.2% | 49.5% |
| Median Age | 48.3 | 43.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,983 | 8,269 | 309,327,143 |
| Population - 2000 | 2,803 | 7,429 | 285,036,114 |
| Population - 1990 | 2,017 | 7,034 | 251,960,433 |
| Pop. 2000 to Now | 48.6% | 16.3% | 15.6% |
| Pop. 1990 to Now | 106.5% | 22.8% | 30.8% |
| space4 | | | |
| Population Density | 681.2 | 1,049.6 | 93.4 |
| Land Area | 5.2 | 8.4 | 3,531,905.4 |
| Water Area | 1.2 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Fox Island, WA | Signal Mountain, TN | United States |
| Age 0 to 4 | 4.6% | 3.4% | 5.9% |
| Age 5 to 9 | 4.6% | 10.3% | 6.1% |
| Age 10 to 14 | 6.5% | 11.0% | 6.6% |
| Age 15 to 17 | 3.5% | 4.1% | 3.9% |
| Age 18 to 20 | 2.9% | 2.1% | 4.0% |
| Age 21 to 24 | 2.8% | 0.8% | 5.2% |
| Age 25 to 34 | 8.2% | 4.9% | 13.8% |
| Age 35 to 44 | 11.8% | 14.4% | 12.9% |
| Age 45 to 54 | 16.2% | 14.9% | 12.6% |
| Age 55 to 59 | 5.3% | 4.5% | 6.7% |
| Age 60 to 64 | 9.5% | 5.7% | 6.3% |
| Age 65 to 74 | 14.5% | 11.7% | 9.6% |
| Age 75 to 84 | 8.4% | 6.7% | 4.5% |
| Age 85 and over | 1.1% | 5.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Fox Island, WA | Signal Mountain, TN | United States |
| White | 89.5% | 96.0% | 59.4% |
| Black | 0.0% | 0.3% | 12.2% |
| Asian | 1.0% | 0.3% | 5.6% |
| Native American | 0.7% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.2% | 0.4% |
| Two or More Races | 4.0% | 2.6% | 3.2% |
| Hispanic | 4.3% | 0.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Fox Island, WA | Signal Mountain, TN | United States |
| Married Population | 68.6% | 70.0% | 49.8% |
| Currently Married | 67.4% | 69.4% | 48.0% |
| Married but Separated | 1.2% | 0.7% | 1.8% |
| Single Population | 31.4% | 30.0% | 50.2% |
| Never Married | 18.2% | 14.8% | 33.8% |
| Divorced | 8.0% | 8.4% | 10.8% |
| Widowed | 5.2% | 6.8% | 5.6% |
| space5 | | | |
| Household Size | 2.58 | 2.58 | 2.60 |
| Households | 1,371 | 3,341 | 124,010,992 |
| Family Households | 1,042 | 2,456 | 80,755,759 |
| Married couple, w/children | 35.0% | 43.9% | 30.5% |
| Married couple, no children | 58.9% | 47.1% | 42.9% |
| Non Family Households | 329 | 885 | 43,255,233 |
| Single householder, w/children | 0.7% | 6.3% | 15.8% |
| Single householder, no children | 5.4% | 2.8% | 10.8% |