| | Belfry, MT | Bend, OR | United States |
| Population | 229 | 97,042 | 329,725,481 |
| Female Population | 48.5% | 50.2% | 50.5% |
| Male Population | 51.5% | 49.9% | 49.5% |
| Median Age | 40.4 | 38.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 166 | 76,658 | 309,327,143 |
| Population - 2000 | 219 | 52,029 | 285,036,114 |
| Population - 1990 | 145 | 20,469 | 251,960,433 |
| Pop. 2000 to Now | 1.8% | 95.8% | 15.6% |
| Pop. 1990 to Now | 53.8% | 397.8% | 30.8% |
| space4 | | | |
| Population Density | 137.5 | 2,933.2 | 93.4 |
| Land Area | 1.7 | 33.1 | 3,531,905.4 |
| Water Area | 0.1 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Belfry, MT | Bend, OR | United States |
| Age 0 to 4 | 3.5% | 5.8% | 5.9% |
| Age 5 to 9 | 2.6% | 6.9% | 6.1% |
| Age 10 to 14 | 3.9% | 5.5% | 6.6% |
| Age 15 to 17 | 3.9% | 4.1% | 3.9% |
| Age 18 to 20 | 0.0% | 2.6% | 4.0% |
| Age 21 to 24 | 3.5% | 4.6% | 5.2% |
| Age 25 to 34 | 25.8% | 15.3% | 13.8% |
| Age 35 to 44 | 13.1% | 15.0% | 12.9% |
| Age 45 to 54 | 8.3% | 12.9% | 12.6% |
| Age 55 to 59 | 2.6% | 5.3% | 6.7% |
| Age 60 to 64 | 5.7% | 5.8% | 6.3% |
| Age 65 to 74 | 11.4% | 10.1% | 9.6% |
| Age 75 to 84 | 11.4% | 4.2% | 4.5% |
| Age 85 and over | 4.4% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Belfry, MT | Bend, OR | United States |
| White | 76.4% | 84.2% | 59.4% |
| Black | 0.0% | 0.7% | 12.2% |
| Asian | 0.0% | 1.6% | 5.6% |
| Native American | 1.3% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 1.7% | 4.0% | 3.2% |
| Hispanic | 20.5% | 8.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Belfry, MT | Bend, OR | United States |
| Married Population | 41.3% | 53.1% | 49.8% |
| Currently Married | 39.3% | 52.2% | 48.0% |
| Married but Separated | 1.9% | 0.8% | 1.8% |
| Single Population | 58.7% | 47.0% | 50.2% |
| Never Married | 37.4% | 30.4% | 33.8% |
| Divorced | 9.7% | 12.8% | 10.8% |
| Widowed | 11.7% | 3.8% | 5.6% |
| space5 | | | |
| Household Size | 2.83 | 2.40 | 2.60 |
| Households | 81 | 40,158 | 124,010,992 |
| Family Households | 47 | 25,162 | 80,755,759 |
| Married couple, w/children | 34.0% | 33.0% | 30.5% |
| Married couple, no children | 40.4% | 43.6% | 42.9% |
| Non Family Households | 34 | 14,996 | 43,255,233 |
| Single householder, w/children | 12.8% | 15.3% | 15.8% |
| Single householder, no children | 12.8% | 8.1% | 10.8% |