| | Roberts, ID | Rigby, ID | United States |
| Population | 425 | 4,920 | 329,725,481 |
| Female Population | 56.5% | 49.7% | 50.5% |
| Male Population | 43.5% | 50.3% | 49.5% |
| Median Age | 33.3 | 27.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 601 | 3,944 | 309,327,143 |
| Population - 2000 | 647 | 2,998 | 285,036,114 |
| Population - 1990 | 557 | 2,681 | 251,960,433 |
| Pop. 2000 to Now | 0.3% | 47.8% | 15.6% |
| Pop. 1990 to Now | 16.5% | 65.2% | 30.8% |
| space4 | | | |
| Population Density | 1,353.5 | 2,088.3 | 93.4 |
| Land Area | 0.3 | 2.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Roberts, ID | Rigby, ID | United States |
| Age 0 to 4 | 7.5% | 15.1% | 5.9% |
| Age 5 to 9 | 3.1% | 8.6% | 6.1% |
| Age 10 to 14 | 12.9% | 7.4% | 6.6% |
| Age 15 to 17 | 10.6% | 1.7% | 3.9% |
| Age 18 to 20 | 0.2% | 0.7% | 4.0% |
| Age 21 to 24 | 5.9% | 8.3% | 5.2% |
| Age 25 to 34 | 12.7% | 22.9% | 13.8% |
| Age 35 to 44 | 16.2% | 9.5% | 12.9% |
| Age 45 to 54 | 11.1% | 10.4% | 12.6% |
| Age 55 to 59 | 4.5% | 3.4% | 6.7% |
| Age 60 to 64 | 6.1% | 1.9% | 6.3% |
| Age 65 to 74 | 7.5% | 5.3% | 9.6% |
| Age 75 to 84 | 1.2% | 3.1% | 4.5% |
| Age 85 and over | 0.5% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Roberts, ID | Rigby, ID | United States |
| White | 46.6% | 81.3% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 1.5% | 5.6% |
| Native American | 0.0% | 3.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.4% | 1.5% | 3.2% |
| Hispanic | 51.1% | 11.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Roberts, ID | Rigby, ID | United States |
| Married Population | 61.8% | 72.9% | 49.8% |
| Currently Married | 52.9% | 70.1% | 48.0% |
| Married but Separated | 8.9% | 2.9% | 1.8% |
| Single Population | 38.2% | 27.1% | 50.2% |
| Never Married | 20.9% | 11.6% | 33.8% |
| Divorced | 10.5% | 10.3% | 10.8% |
| Widowed | 6.8% | 5.1% | 5.6% |
| space5 | | | |
| Household Size | 2.49 | 2.70 | 2.60 |
| Households | 171 | 1,808 | 124,010,992 |
| Family Households | 150 | 1,320 | 80,755,759 |
| Married couple, w/children | 24.0% | 48.3% | 30.5% |
| Married couple, no children | 24.0% | 40.5% | 42.9% |
| Non Family Households | 21 | 488 | 43,255,233 |
| Single householder, w/children | 49.3% | 8.9% | 15.8% |
| Single householder, no children | 2.7% | 2.3% | 10.8% |