| | Three Rivers, CA | Magalia, CA | United States |
| Population | 2,601 | 10,537 | 329,725,481 |
| Female Population | 42.8% | 51.9% | 50.5% |
| Male Population | 57.2% | 48.1% | 49.5% |
| Median Age | 51.7 | 48.8 | 38.4 |
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| Population - 2010 | 1,949 | 11,640 | 309,327,143 |
| Population - 2000 | 2,248 | 10,569 | 285,036,114 |
| Population - 1990 | 2,211 | 8,987 | 251,960,433 |
| Pop. 2000 to Now | 2.4% | 10.6% | 15.6% |
| Pop. 1990 to Now | 4.1% | 30.1% | 30.8% |
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| Population Density | 58.5 | 751.8 | 93.4 |
| Land Area | 44.5 | 14.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Three Rivers, CA | Magalia, CA | United States |
| Age 0 to 4 | 1.1% | 6.3% | 5.9% |
| Age 5 to 9 | 4.7% | 3.0% | 6.1% |
| Age 10 to 14 | 8.2% | 4.4% | 6.6% |
| Age 15 to 17 | 3.6% | 3.6% | 3.9% |
| Age 18 to 20 | 0.5% | 3.0% | 4.0% |
| Age 21 to 24 | 1.6% | 4.2% | 5.2% |
| Age 25 to 34 | 7.8% | 10.9% | 13.8% |
| Age 35 to 44 | 7.2% | 8.7% | 12.9% |
| Age 45 to 54 | 20.4% | 13.4% | 12.6% |
| Age 55 to 59 | 12.2% | 9.3% | 6.7% |
| Age 60 to 64 | 7.8% | 9.0% | 6.3% |
| Age 65 to 74 | 17.2% | 17.3% | 9.6% |
| Age 75 to 84 | 6.3% | 5.4% | 4.5% |
| Age 85 and over | 1.5% | 1.7% | 1.9% |
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| Race | | | |
| | Three Rivers, CA | Magalia, CA | United States |
| White | 78.0% | 79.5% | 59.4% |
| Black | 2.1% | 0.0% | 12.2% |
| Asian | 5.3% | 1.2% | 5.6% |
| Native American | 0.9% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.9% | 8.0% | 3.2% |
| Hispanic | 10.7% | 11.0% | 18.4% |
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| Marriage & Family | | | |
| | Three Rivers, CA | Magalia, CA | United States |
| Married Population | 56.2% | 43.2% | 49.8% |
| Currently Married | 54.1% | 41.1% | 48.0% |
| Married but Separated | 2.1% | 2.1% | 1.8% |
| Single Population | 43.8% | 56.8% | 50.2% |
| Never Married | 20.8% | 30.7% | 33.8% |
| Divorced | 18.1% | 18.1% | 10.8% |
| Widowed | 5.0% | 8.0% | 5.6% |
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| Household Size | 2.03 | 2.50 | 2.60 |
| Households | 1,278 | 4,209 | 124,010,992 |
| Family Households | 821 | 2,697 | 80,755,759 |
| Married couple, w/children | 16.1% | 17.5% | 30.5% |
| Married couple, no children | 51.4% | 48.1% | 42.9% |
| Non Family Households | 457 | 1,512 | 43,255,233 |
| Single householder, w/children | 26.9% | 19.7% | 15.8% |
| Single householder, no children | 5.6% | 14.7% | 10.8% |