| | Kalama, WA | Scappoose, OR | United States |
| Population | 2,888 | 7,871 | 329,725,481 |
| Female Population | 52.9% | 48.6% | 50.5% |
| Male Population | 47.1% | 51.4% | 49.5% |
| Median Age | 54.7 | 38.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,358 | 6,715 | 309,327,143 |
| Population - 2000 | 1,783 | 4,976 | 285,036,114 |
| Population - 1990 | 1,210 | 3,529 | 251,960,433 |
| Pop. 2000 to Now | 59.5% | 53.1% | 15.6% |
| Pop. 1990 to Now | 135.0% | 115.9% | 30.8% |
| space4 | | | |
| Population Density | 829.2 | 2,877.9 | 93.4 |
| Land Area | 3.5 | 2.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Kalama, WA | Scappoose, OR | United States |
| Age 0 to 4 | 3.1% | 7.5% | 5.9% |
| Age 5 to 9 | 3.8% | 6.4% | 6.1% |
| Age 10 to 14 | 3.0% | 9.4% | 6.6% |
| Age 15 to 17 | 4.5% | 3.3% | 3.9% |
| Age 18 to 20 | 2.6% | 3.0% | 4.0% |
| Age 21 to 24 | 1.2% | 2.6% | 5.2% |
| Age 25 to 34 | 10.6% | 10.0% | 13.8% |
| Age 35 to 44 | 10.1% | 18.9% | 12.9% |
| Age 45 to 54 | 11.3% | 12.2% | 12.6% |
| Age 55 to 59 | 7.3% | 4.7% | 6.7% |
| Age 60 to 64 | 20.2% | 4.2% | 6.3% |
| Age 65 to 74 | 13.4% | 11.7% | 9.6% |
| Age 75 to 84 | 7.5% | 5.1% | 4.5% |
| Age 85 and over | 1.3% | 1.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Kalama, WA | Scappoose, OR | United States |
| White | 81.6% | 83.1% | 59.4% |
| Black | 0.0% | 0.1% | 12.2% |
| Asian | 0.0% | 1.3% | 5.6% |
| Native American | 0.8% | 0.7% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 10.4% | 5.1% | 3.2% |
| Hispanic | 7.3% | 9.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Kalama, WA | Scappoose, OR | United States |
| Married Population | 64.7% | 61.2% | 49.8% |
| Currently Married | 63.7% | 59.3% | 48.0% |
| Married but Separated | 1.0% | 1.9% | 1.8% |
| Single Population | 35.3% | 38.8% | 50.2% |
| Never Married | 18.7% | 24.4% | 33.8% |
| Divorced | 9.8% | 9.2% | 10.8% |
| Widowed | 6.8% | 5.1% | 5.6% |
| space5 | | | |
| Household Size | 2.13 | 2.71 | 2.60 |
| Households | 1,356 | 2,889 | 124,010,992 |
| Family Households | 902 | 2,068 | 80,755,759 |
| Married couple, w/children | 20.3% | 35.5% | 30.5% |
| Married couple, no children | 69.0% | 45.2% | 42.9% |
| Non Family Households | 454 | 821 | 43,255,233 |
| Single householder, w/children | 5.8% | 12.3% | 15.8% |
| Single householder, no children | 5.0% | 7.1% | 10.8% |