| | Fern Forest, HI | Neilton, WA | United States |
| Population | 787 | 299 | 329,725,481 |
| Female Population | 53.4% | 43.8% | 50.5% |
| Male Population | 46.6% | 56.2% | 49.5% |
| Median Age | 52.1 | 38.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 648 | 351 | 309,327,143 |
| Population - 2000 | 480 | 345 | 285,036,114 |
| Population - 1990 | 401 | 462 | 251,960,433 |
| Pop. 2000 to Now | 81.0% | 15.7% | 15.6% |
| Pop. 1990 to Now | 116.7% | -13.6% | 30.8% |
| space4 | | | |
| Population Density | 63.1 | 30.9 | 93.4 |
| Land Area | 12.5 | 9.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Fern Forest, HI | Neilton, WA | United States |
| Age 0 to 4 | 3.4% | 4.0% | 5.9% |
| Age 5 to 9 | 5.8% | 12.0% | 6.1% |
| Age 10 to 14 | 3.6% | 7.4% | 6.6% |
| Age 15 to 17 | 1.5% | 0.0% | 3.9% |
| Age 18 to 20 | 0.0% | 3.7% | 4.0% |
| Age 21 to 24 | 0.8% | 0.0% | 5.2% |
| Age 25 to 34 | 8.9% | 16.1% | 13.8% |
| Age 35 to 44 | 19.6% | 17.1% | 12.9% |
| Age 45 to 54 | 10.5% | 2.7% | 12.6% |
| Age 55 to 59 | 7.0% | 2.7% | 6.7% |
| Age 60 to 64 | 15.8% | 6.0% | 6.3% |
| Age 65 to 74 | 18.2% | 18.1% | 9.6% |
| Age 75 to 84 | 5.0% | 1.7% | 4.5% |
| Age 85 and over | 0.0% | 8.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Fern Forest, HI | Neilton, WA | United States |
| White | 34.1% | 78.6% | 59.4% |
| Black | 1.3% | 0.0% | 12.2% |
| Asian | 8.1% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 4.2% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 34.3% | 3.0% | 3.2% |
| Hispanic | 18.0% | 18.4% | 18.4% |
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| Marriage & Family | | | |
| | Fern Forest, HI | Neilton, WA | United States |
| Married Population | 42.6% | 48.9% | 49.8% |
| Currently Married | 41.8% | 48.9% | 48.0% |
| Married but Separated | 0.7% | 0.0% | 1.8% |
| Single Population | 57.4% | 51.1% | 50.2% |
| Never Married | 24.5% | 40.6% | 33.8% |
| Divorced | 27.3% | 0.0% | 10.8% |
| Widowed | 5.7% | 10.5% | 5.6% |
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| Household Size | 2.20 | 2.79 | 2.60 |
| Households | 358 | 107 | 124,010,992 |
| Family Households | 170 | 64 | 80,755,759 |
| Married couple, w/children | 14.7% | 25.0% | 30.5% |
| Married couple, no children | 64.1% | 50.0% | 42.9% |
| Non Family Households | 188 | 43 | 43,255,233 |
| Single householder, w/children | 15.9% | 25.0% | 15.8% |
| Single householder, no children | 5.3% | 0.0% | 10.8% |