| | Clark Fork, ID | Happy Camp, CA | United States |
| Population | 867 | 854 | 329,725,481 |
| Female Population | 49.1% | 45.8% | 50.5% |
| Male Population | 50.9% | 54.2% | 49.5% |
| Median Age | 41 | 56.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 530 | 1,152 | 309,327,143 |
| Population - 2000 | 530 | 1,168 | 285,036,114 |
| Population - 1990 | 448 | 1,589 | 251,960,433 |
| Pop. 2000 to Now | 11.1% | -31.6% | 15.6% |
| Pop. 1990 to Now | 31.5% | -49.7% | 30.8% |
| space4 | | | |
| Population Density | 880.2 | 70.5 | 93.4 |
| Land Area | 1.0 | 12.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Clark Fork, ID | Happy Camp, CA | United States |
| Age 0 to 4 | 2.4% | 5.7% | 5.9% |
| Age 5 to 9 | 0.5% | 5.9% | 6.1% |
| Age 10 to 14 | 10.3% | 2.0% | 6.6% |
| Age 15 to 17 | 4.6% | 1.2% | 3.9% |
| Age 18 to 20 | 9.1% | 2.6% | 4.0% |
| Age 21 to 24 | 0.3% | 4.5% | 5.2% |
| Age 25 to 34 | 3.3% | 13.5% | 13.8% |
| Age 35 to 44 | 20.2% | 4.8% | 12.9% |
| Age 45 to 54 | 18.3% | 7.7% | 12.6% |
| Age 55 to 59 | 4.7% | 8.3% | 6.7% |
| Age 60 to 64 | 9.5% | 18.9% | 6.3% |
| Age 65 to 74 | 12.5% | 15.3% | 9.6% |
| Age 75 to 84 | 2.7% | 6.8% | 4.5% |
| Age 85 and over | 1.6% | 2.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Clark Fork, ID | Happy Camp, CA | United States |
| White | 93.5% | 47.5% | 59.4% |
| Black | 0.0% | 0.1% | 12.2% |
| Asian | 0.0% | 0.8% | 5.6% |
| Native American | 0.8% | 24.9% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 4.2% | 21.5% | 3.2% |
| Hispanic | 1.5% | 4.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Clark Fork, ID | Happy Camp, CA | United States |
| Married Population | 29.0% | 39.7% | 49.8% |
| Currently Married | 28.6% | 33.5% | 48.0% |
| Married but Separated | 0.4% | 6.2% | 1.8% |
| Single Population | 71.0% | 60.3% | 50.2% |
| Never Married | 38.1% | 25.2% | 33.8% |
| Divorced | 27.5% | 24.0% | 10.8% |
| Widowed | 5.4% | 11.1% | 5.6% |
| space5 | | | |
| Household Size | 2.29 | 2.16 | 2.60 |
| Households | 378 | 388 | 124,010,992 |
| Family Households | 147 | 189 | 80,755,759 |
| Married couple, w/children | 5.4% | 15.3% | 30.5% |
| Married couple, no children | 67.3% | 47.1% | 42.9% |
| Non Family Households | 231 | 199 | 43,255,233 |
| Single householder, w/children | 9.5% | 15.9% | 15.8% |
| Single householder, no children | 17.7% | 21.7% | 10.8% |