| | Koosharem, UT | Castle Dale, UT | United States |
| Population | 284 | 1,375 | 329,725,481 |
| Female Population | 51.1% | 48.3% | 50.5% |
| Male Population | 48.9% | 51.7% | 49.5% |
| Median Age | 18 | 36.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 321 | 1,643 | 309,327,143 |
| Population - 2000 | 276 | 1,657 | 285,036,114 |
| Population - 1990 | 266 | 1,704 | 251,960,433 |
| Pop. 2000 to Now | 23.9% | -8.8% | 15.6% |
| Pop. 1990 to Now | 28.6% | -11.3% | 30.8% |
| space4 | | | |
| Population Density | 315.9 | 623.3 | 93.4 |
| Land Area | 0.9 | 2.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Koosharem, UT | Castle Dale, UT | United States |
| Age 0 to 4 | 9.5% | 5.3% | 5.9% |
| Age 5 to 9 | 12.7% | 17.0% | 6.1% |
| Age 10 to 14 | 12.7% | 7.3% | 6.6% |
| Age 15 to 17 | 15.1% | 4.2% | 3.9% |
| Age 18 to 20 | 5.6% | 1.3% | 4.0% |
| Age 21 to 24 | 0.7% | 1.7% | 5.2% |
| Age 25 to 34 | 11.3% | 10.0% | 13.8% |
| Age 35 to 44 | 4.6% | 13.6% | 12.9% |
| Age 45 to 54 | 7.4% | 5.7% | 12.6% |
| Age 55 to 59 | 4.6% | 5.0% | 6.7% |
| Age 60 to 64 | 1.8% | 6.1% | 6.3% |
| Age 65 to 74 | 4.9% | 13.4% | 9.6% |
| Age 75 to 84 | 9.2% | 8.4% | 4.5% |
| Age 85 and over | 0.0% | 1.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Koosharem, UT | Castle Dale, UT | United States |
| White | 94.7% | 96.7% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.7% | 0.4% |
| Two or More Races | 0.0% | 0.0% | 3.2% |
| Hispanic | 5.3% | 2.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Koosharem, UT | Castle Dale, UT | United States |
| Married Population | 62.2% | 65.9% | 49.8% |
| Currently Married | 62.2% | 64.1% | 48.0% |
| Married but Separated | 0.0% | 1.9% | 1.8% |
| Single Population | 37.8% | 34.1% | 50.2% |
| Never Married | 31.9% | 16.2% | 33.8% |
| Divorced | 4.3% | 7.7% | 10.8% |
| Widowed | 1.6% | 10.1% | 5.6% |
| space5 | | | |
| Household Size | 3.17 | 2.80 | 2.60 |
| Households | 69 | 491 | 124,010,992 |
| Family Households | 59 | 349 | 80,755,759 |
| Married couple, w/children | 47.5% | 36.7% | 30.5% |
| Married couple, no children | 45.8% | 48.7% | 42.9% |
| Non Family Households | 10 | 142 | 43,255,233 |
| Single householder, w/children | 6.8% | 12.6% | 15.8% |
| Single householder, no children | 0.0% | 2.0% | 10.8% |