| | Riverside, WY | Rexburg, ID | United States |
| Population | 26 | 33,684 | 329,725,481 |
| Female Population | 30.8% | 49.5% | 50.5% |
| Male Population | 69.2% | 50.5% | 49.5% |
| Median Age | 67.2 | 22.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 52 | 25,551 | 309,327,143 |
| Population - 2000 | 59 | 17,257 | 285,036,114 |
| Population - 1990 | 85 | 14,302 | 251,960,433 |
| Pop. 2000 to Now | -10.2% | 71.9% | 15.6% |
| Pop. 1990 to Now | -37.7% | 107.4% | 30.8% |
| space4 | | | |
| Population Density | 96.3 | 3,430.1 | 93.4 |
| Land Area | 0.3 | 9.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Riverside, WY | Rexburg, ID | United States |
| Age 0 to 4 | 0.0% | 9.4% | 5.9% |
| Age 5 to 9 | 0.0% | 5.4% | 6.1% |
| Age 10 to 14 | 0.0% | 4.6% | 6.6% |
| Age 15 to 17 | 0.0% | 3.4% | 3.9% |
| Age 18 to 20 | 0.0% | 14.1% | 4.0% |
| Age 21 to 24 | 0.0% | 26.1% | 5.2% |
| Age 25 to 34 | 0.0% | 16.9% | 13.8% |
| Age 35 to 44 | 23.1% | 5.2% | 12.9% |
| Age 45 to 54 | 0.0% | 5.2% | 12.6% |
| Age 55 to 59 | 0.0% | 2.1% | 6.7% |
| Age 60 to 64 | 23.1% | 2.3% | 6.3% |
| Age 65 to 74 | 34.6% | 2.4% | 9.6% |
| Age 75 to 84 | 19.2% | 1.8% | 4.5% |
| Age 85 and over | 0.0% | 1.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Riverside, WY | Rexburg, ID | United States |
| White | 100.0% | 86.1% | 59.4% |
| Black | 0.0% | 0.4% | 12.2% |
| Asian | 0.0% | 2.3% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 0.0% | 2.0% | 3.2% |
| Hispanic | 0.0% | 8.8% | 18.4% |
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| Marriage & Family | | | |
| | Riverside, WY | Rexburg, ID | United States |
| Married Population | 53.8% | 45.7% | 49.8% |
| Currently Married | 53.8% | 45.0% | 48.0% |
| Married but Separated | 0.0% | 0.6% | 1.8% |
| Single Population | 46.2% | 54.3% | 50.2% |
| Never Married | 11.5% | 49.5% | 33.8% |
| Divorced | 30.8% | 3.2% | 10.8% |
| Widowed | 3.8% | 1.6% | 5.6% |
| space5 | | | |
| Household Size | 1.44 | 4.36 | 2.60 |
| Households | 18 | 7,659 | 124,010,992 |
| Family Households | 7 | 5,834 | 80,755,759 |
| Married couple, w/children | 0.0% | 42.6% | 30.5% |
| Married couple, no children | 100.0% | 49.8% | 42.9% |
| Non Family Households | 11 | 1,825 | 43,255,233 |
| Single householder, w/children | 0.0% | 6.3% | 15.8% |
| Single householder, no children | 0.0% | 1.4% | 10.8% |