| | Valier, MT | Power, MT | United States |
| Population | 529 | 197 | 329,725,481 |
| Female Population | 51.6% | 54.3% | 50.5% |
| Male Population | 48.4% | 45.7% | 49.5% |
| Median Age | 50.9 | 37.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 510 | 191 | 309,327,143 |
| Population - 2000 | 498 | 171 | 285,036,114 |
| Population - 1990 | 519 | 165 | 251,960,433 |
| Pop. 2000 to Now | -4.8% | 12.3% | 15.6% |
| Pop. 1990 to Now | -8.7% | 16.4% | 30.8% |
| space4 | | | |
| Population Density | 611.6 | 131.4 | 93.4 |
| Land Area | 0.9 | 1.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Valier, MT | Power, MT | United States |
| Age 0 to 4 | 4.0% | 13.2% | 5.9% |
| Age 5 to 9 | 4.2% | 15.7% | 6.1% |
| Age 10 to 14 | 7.8% | 1.5% | 6.6% |
| Age 15 to 17 | 2.6% | 0.5% | 3.9% |
| Age 18 to 20 | 4.0% | 1.0% | 4.0% |
| Age 21 to 24 | 6.6% | 4.6% | 5.2% |
| Age 25 to 34 | 7.2% | 12.7% | 13.8% |
| Age 35 to 44 | 6.0% | 8.6% | 12.9% |
| Age 45 to 54 | 11.7% | 5.6% | 12.6% |
| Age 55 to 59 | 4.7% | 7.6% | 6.7% |
| Age 60 to 64 | 13.2% | 3.0% | 6.3% |
| Age 65 to 74 | 15.9% | 14.2% | 9.6% |
| Age 75 to 84 | 7.2% | 10.2% | 4.5% |
| Age 85 and over | 4.9% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Valier, MT | Power, MT | United States |
| White | 84.3% | 78.7% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 13.0% | 21.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.6% | 0.0% | 3.2% |
| Hispanic | 0.0% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Valier, MT | Power, MT | United States |
| Married Population | 48.1% | 57.7% | 49.8% |
| Currently Married | 45.6% | 55.5% | 48.0% |
| Married but Separated | 2.5% | 2.2% | 1.8% |
| Single Population | 51.9% | 42.3% | 50.2% |
| Never Married | 24.5% | 18.2% | 33.8% |
| Divorced | 15.5% | 4.4% | 10.8% |
| Widowed | 11.9% | 19.7% | 5.6% |
| space5 | | | |
| Household Size | 2.09 | 2.16 | 2.60 |
| Households | 253 | 91 | 124,010,992 |
| Family Households | 124 | 42 | 80,755,759 |
| Married couple, w/children | 18.5% | 35.7% | 30.5% |
| Married couple, no children | 60.5% | 52.4% | 42.9% |
| Non Family Households | 129 | 49 | 43,255,233 |
| Single householder, w/children | 12.9% | 4.8% | 15.8% |
| Single householder, no children | 8.1% | 7.1% | 10.8% |