| | Twisp, WA | Clark Fork, ID | United States |
| Population | 1,211 | 867 | 329,725,481 |
| Female Population | 53.8% | 49.1% | 50.5% |
| Male Population | 46.2% | 50.9% | 49.5% |
| Median Age | 44.3 | 41 | 38.4 |
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| Population - 2010 | 904 | 530 | 309,327,143 |
| Population - 2000 | 938 | 530 | 285,036,114 |
| Population - 1990 | 872 | 448 | 251,960,433 |
| Pop. 2000 to Now | 5.3% | 11.1% | 15.6% |
| Pop. 1990 to Now | 13.3% | 31.5% | 30.8% |
| space4 | | | |
| Population Density | 1,030.6 | 880.2 | 93.4 |
| Land Area | 1.2 | 1.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Twisp, WA | Clark Fork, ID | United States |
| Age 0 to 4 | 2.7% | 2.4% | 5.9% |
| Age 5 to 9 | 3.8% | 0.5% | 6.1% |
| Age 10 to 14 | 10.7% | 10.3% | 6.6% |
| Age 15 to 17 | 2.6% | 4.6% | 3.9% |
| Age 18 to 20 | 1.6% | 9.1% | 4.0% |
| Age 21 to 24 | 5.2% | 0.3% | 5.2% |
| Age 25 to 34 | 9.9% | 3.3% | 13.8% |
| Age 35 to 44 | 14.2% | 20.2% | 12.9% |
| Age 45 to 54 | 13.3% | 18.3% | 12.6% |
| Age 55 to 59 | 6.6% | 4.7% | 6.7% |
| Age 60 to 64 | 8.2% | 9.5% | 6.3% |
| Age 65 to 74 | 13.6% | 12.5% | 9.6% |
| Age 75 to 84 | 6.4% | 2.7% | 4.5% |
| Age 85 and over | 1.2% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Twisp, WA | Clark Fork, ID | United States |
| White | 77.0% | 93.5% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 2.3% | 0.0% | 5.6% |
| Native American | 0.7% | 0.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.2% | 4.2% | 3.2% |
| Hispanic | 19.7% | 1.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Twisp, WA | Clark Fork, ID | United States |
| Married Population | 49.8% | 29.0% | 49.8% |
| Currently Married | 48.6% | 28.6% | 48.0% |
| Married but Separated | 1.2% | 0.4% | 1.8% |
| Single Population | 50.2% | 71.0% | 50.2% |
| Never Married | 24.7% | 38.1% | 33.8% |
| Divorced | 24.4% | 27.5% | 10.8% |
| Widowed | 1.1% | 5.4% | 5.6% |
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| Household Size | 2.19 | 2.29 | 2.60 |
| Households | 554 | 378 | 124,010,992 |
| Family Households | 341 | 147 | 80,755,759 |
| Married couple, w/children | 32.0% | 5.4% | 30.5% |
| Married couple, no children | 44.6% | 67.3% | 42.9% |
| Non Family Households | 213 | 231 | 43,255,233 |
| Single householder, w/children | 18.2% | 9.5% | 15.8% |
| Single householder, no children | 5.3% | 17.7% | 10.8% |