| | Napavine, WA | Vader, WA | United States |
| Population | 1,495 | 787 | 329,725,481 |
| Female Population | 49.6% | 48.3% | 50.5% |
| Male Population | 50.4% | 51.7% | 49.5% |
| Median Age | 34.2 | 33.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,793 | 621 | 309,327,143 |
| Population - 2000 | 1,361 | 590 | 285,036,114 |
| Population - 1990 | 745 | 414 | 251,960,433 |
| Pop. 2000 to Now | 50.0% | 14.8% | 15.6% |
| Pop. 1990 to Now | 174.1% | 63.5% | 30.8% |
| space4 | | | |
| Population Density | 516.8 | 846.2 | 93.4 |
| Land Area | 2.9 | 0.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Napavine, WA | Vader, WA | United States |
| Age 0 to 4 | 6.4% | 11.9% | 5.9% |
| Age 5 to 9 | 5.6% | 5.0% | 6.1% |
| Age 10 to 14 | 9.0% | 7.0% | 6.6% |
| Age 15 to 17 | 2.9% | 1.4% | 3.9% |
| Age 18 to 20 | 2.4% | 6.7% | 4.0% |
| Age 21 to 24 | 8.0% | 9.1% | 5.2% |
| Age 25 to 34 | 18.3% | 12.7% | 13.8% |
| Age 35 to 44 | 16.3% | 8.9% | 12.9% |
| Age 45 to 54 | 11.8% | 7.6% | 12.6% |
| Age 55 to 59 | 3.4% | 8.1% | 6.7% |
| Age 60 to 64 | 4.5% | 2.8% | 6.3% |
| Age 65 to 74 | 7.6% | 11.2% | 9.6% |
| Age 75 to 84 | 3.5% | 6.6% | 4.5% |
| Age 85 and over | 0.2% | 0.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Napavine, WA | Vader, WA | United States |
| White | 87.5% | 74.0% | 59.4% |
| Black | 0.5% | 0.0% | 12.2% |
| Asian | 0.1% | 0.0% | 5.6% |
| Native American | 0.8% | 1.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 7.2% | 3.6% | 3.2% |
| Hispanic | 3.6% | 21.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Napavine, WA | Vader, WA | United States |
| Married Population | 54.3% | 55.6% | 49.8% |
| Currently Married | 50.8% | 53.3% | 48.0% |
| Married but Separated | 3.5% | 2.3% | 1.8% |
| Single Population | 45.7% | 44.4% | 50.2% |
| Never Married | 25.4% | 29.9% | 33.8% |
| Divorced | 14.6% | 8.3% | 10.8% |
| Widowed | 5.8% | 6.2% | 5.6% |
| space5 | | | |
| Household Size | 2.77 | 3.16 | 2.60 |
| Households | 539 | 249 | 124,010,992 |
| Family Households | 412 | 199 | 80,755,759 |
| Married couple, w/children | 35.7% | 38.7% | 30.5% |
| Married couple, no children | 30.1% | 31.7% | 42.9% |
| Non Family Households | 127 | 50 | 43,255,233 |
| Single householder, w/children | 20.1% | 18.1% | 15.8% |
| Single householder, no children | 14.1% | 11.6% | 10.8% |