| | Garden Valley, ID | Stevensville, MT | United States |
| Population | 411 | 1,959 | 329,725,481 |
| Female Population | 48.7% | 52.7% | 50.5% |
| Male Population | 51.3% | 47.3% | 49.5% |
| Median Age | 37.8 | 40.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 555 | 1,837 | 309,327,143 |
| Population - 2000 | 318 | 1,553 | 285,036,114 |
| Population - 1990 | 175 | 1,221 | 251,960,433 |
| Pop. 2000 to Now | 25.8% | 37.7% | 15.6% |
| Pop. 1990 to Now | 128.6% | 75.1% | 30.8% |
| space4 | | | |
| Population Density | 55.8 | 1,512.7 | 93.4 |
| Land Area | 7.4 | 1.3 | 3,531,905.4 |
| Water Area | 0.2 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Garden Valley, ID | Stevensville, MT | United States |
| Age 0 to 4 | 3.2% | 6.6% | 5.9% |
| Age 5 to 9 | 0.0% | 8.6% | 6.1% |
| Age 10 to 14 | 8.8% | 5.3% | 6.6% |
| Age 15 to 17 | 4.9% | 3.9% | 3.9% |
| Age 18 to 20 | 9.2% | 4.8% | 4.0% |
| Age 21 to 24 | 3.9% | 4.0% | 5.2% |
| Age 25 to 34 | 11.7% | 8.7% | 13.8% |
| Age 35 to 44 | 15.6% | 14.2% | 12.9% |
| Age 45 to 54 | 19.2% | 12.8% | 12.6% |
| Age 55 to 59 | 8.3% | 4.4% | 6.7% |
| Age 60 to 64 | 9.0% | 7.4% | 6.3% |
| Age 65 to 74 | 6.3% | 9.4% | 9.6% |
| Age 75 to 84 | 0.0% | 7.3% | 4.5% |
| Age 85 and over | 0.0% | 2.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Garden Valley, ID | Stevensville, MT | United States |
| White | 91.0% | 94.2% | 59.4% |
| Black | 3.9% | 0.2% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.2% | 1.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.2% | 2.6% | 3.2% |
| Hispanic | 2.7% | 1.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Garden Valley, ID | Stevensville, MT | United States |
| Married Population | 39.0% | 40.6% | 49.8% |
| Currently Married | 39.0% | 38.4% | 48.0% |
| Married but Separated | 0.0% | 2.2% | 1.8% |
| Single Population | 61.1% | 59.4% | 50.2% |
| Never Married | 37.8% | 30.4% | 33.8% |
| Divorced | 23.2% | 20.9% | 10.8% |
| Widowed | 0.0% | 8.1% | 5.6% |
| space5 | | | |
| Household Size | 2.53 | 2.12 | 2.60 |
| Households | 144 | 907 | 124,010,992 |
| Family Households | 96 | 416 | 80,755,759 |
| Married couple, w/children | 18.8% | 23.1% | 30.5% |
| Married couple, no children | 39.6% | 42.3% | 42.9% |
| Non Family Households | 48 | 491 | 43,255,233 |
| Single householder, w/children | 37.5% | 28.1% | 15.8% |
| Single householder, no children | 4.2% | 6.5% | 10.8% |