| | Three Rivers, OR | Sunriver, OR | United States |
| Population | 3,597 | 1,530 | 329,725,481 |
| Female Population | 42.4% | 51.3% | 50.5% |
| Male Population | 57.6% | 48.7% | 49.5% |
| Median Age | 50.1 | 64.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,922 | 804 | 309,327,143 |
| Population - 2000 | 2,445 | 1,704 | 285,036,114 |
| Population - 1990 | 1,268 | 1,085 | 251,960,433 |
| Pop. 2000 to Now | 84.7% | -35.0% | 15.6% |
| Pop. 1990 to Now | 256.2% | 2.0% | 30.8% |
| space4 | | | |
| Population Density | 477.7 | 172.9 | 93.4 |
| Land Area | 7.5 | 8.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Three Rivers, OR | Sunriver, OR | United States |
| Age 0 to 4 | 2.0% | 1.2% | 5.9% |
| Age 5 to 9 | 2.4% | 5.3% | 6.1% |
| Age 10 to 14 | 4.2% | 1.9% | 6.6% |
| Age 15 to 17 | 4.8% | 0.0% | 3.9% |
| Age 18 to 20 | 0.8% | 2.0% | 4.0% |
| Age 21 to 24 | 1.4% | 3.4% | 5.2% |
| Age 25 to 34 | 15.7% | 8.0% | 13.8% |
| Age 35 to 44 | 13.7% | 2.4% | 12.9% |
| Age 45 to 54 | 9.4% | 3.4% | 12.6% |
| Age 55 to 59 | 5.9% | 4.1% | 6.7% |
| Age 60 to 64 | 12.3% | 19.7% | 6.3% |
| Age 65 to 74 | 20.7% | 31.6% | 9.6% |
| Age 75 to 84 | 6.6% | 15.4% | 4.5% |
| Age 85 and over | 0.0% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Three Rivers, OR | Sunriver, OR | United States |
| White | 87.9% | 98.1% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 1.2% | 0.0% | 5.6% |
| Native American | 1.7% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 2.2% | 0.0% | 0.4% |
| Two or More Races | 1.0% | 0.0% | 3.2% |
| Hispanic | 6.0% | 1.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Three Rivers, OR | Sunriver, OR | United States |
| Married Population | 56.0% | 64.1% | 49.8% |
| Currently Married | 55.1% | 64.1% | 48.0% |
| Married but Separated | 1.0% | 0.0% | 1.8% |
| Single Population | 44.0% | 35.9% | 50.2% |
| Never Married | 26.1% | 11.1% | 33.8% |
| Divorced | 15.9% | 16.9% | 10.8% |
| Widowed | 2.0% | 7.9% | 5.6% |
| space5 | | | |
| Household Size | 2.19 | 1.92 | 2.60 |
| Households | 1,645 | 798 | 124,010,992 |
| Family Households | 1,037 | 481 | 80,755,759 |
| Married couple, w/children | 30.7% | 7.9% | 30.5% |
| Married couple, no children | 57.8% | 74.8% | 42.9% |
| Non Family Households | 608 | 317 | 43,255,233 |
| Single householder, w/children | 3.8% | 10.8% | 15.8% |
| Single householder, no children | 7.8% | 6.4% | 10.8% |