| | Twin Bridges, MT | Cascade, MT | United States |
| Population | 205 | 574 | 329,725,481 |
| Female Population | 55.1% | 50.7% | 50.5% |
| Male Population | 44.9% | 49.3% | 49.5% |
| Median Age | 60.7 | 58.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 364 | 687 | 309,327,143 |
| Population - 2000 | 400 | 819 | 285,036,114 |
| Population - 1990 | 374 | 729 | 251,960,433 |
| Pop. 2000 to Now | 8.5% | -17.3% | 15.6% |
| Pop. 1990 to Now | 16.0% | -7.1% | 30.8% |
| space4 | | | |
| Population Density | 202.2 | 875.0 | 93.4 |
| Land Area | 1.0 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Twin Bridges, MT | Cascade, MT | United States |
| Age 0 to 4 | 2.0% | 7.1% | 5.9% |
| Age 5 to 9 | 3.9% | 1.7% | 6.1% |
| Age 10 to 14 | 1.0% | 6.6% | 6.6% |
| Age 15 to 17 | 4.9% | 1.6% | 3.9% |
| Age 18 to 20 | 4.4% | 2.6% | 4.0% |
| Age 21 to 24 | 1.5% | 2.1% | 5.2% |
| Age 25 to 34 | 1.0% | 9.4% | 13.8% |
| Age 35 to 44 | 17.1% | 6.1% | 12.9% |
| Age 45 to 54 | 6.8% | 8.7% | 12.6% |
| Age 55 to 59 | 3.9% | 8.4% | 6.7% |
| Age 60 to 64 | 16.6% | 5.9% | 6.3% |
| Age 65 to 74 | 33.2% | 22.6% | 9.6% |
| Age 75 to 84 | 3.9% | 12.0% | 4.5% |
| Age 85 and over | 0.0% | 5.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Twin Bridges, MT | Cascade, MT | United States |
| White | 92.7% | 77.5% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 6.3% | 3.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 12.7% | 3.2% |
| Hispanic | 1.0% | 5.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Twin Bridges, MT | Cascade, MT | United States |
| Married Population | 46.6% | 62.1% | 49.8% |
| Currently Married | 46.6% | 59.8% | 48.0% |
| Married but Separated | 0.0% | 2.3% | 1.8% |
| Single Population | 53.4% | 37.9% | 50.2% |
| Never Married | 28.3% | 21.0% | 33.8% |
| Divorced | 23.0% | 6.4% | 10.8% |
| Widowed | 2.1% | 10.5% | 5.6% |
| space5 | | | |
| Household Size | 1.65 | 2.27 | 2.60 |
| Households | 124 | 239 | 124,010,992 |
| Family Households | 48 | 153 | 80,755,759 |
| Married couple, w/children | 25.0% | 17.0% | 30.5% |
| Married couple, no children | 66.7% | 71.2% | 42.9% |
| Non Family Households | 76 | 86 | 43,255,233 |
| Single householder, w/children | 8.3% | 7.8% | 15.8% |
| Single householder, no children | 0.0% | 3.9% | 10.8% |