| | Poplar, MT | Glasgow, MT | United States |
| Population | 817 | 3,192 | 329,725,481 |
| Female Population | 47.9% | 50.2% | 50.5% |
| Male Population | 52.1% | 49.8% | 49.5% |
| Median Age | 28.7 | 38.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 805 | 3,289 | 309,327,143 |
| Population - 2000 | 911 | 3,253 | 285,036,114 |
| Population - 1990 | 881 | 3,572 | 251,960,433 |
| Pop. 2000 to Now | -8.3% | 1.9% | 15.6% |
| Pop. 1990 to Now | -5.2% | -7.2% | 30.8% |
| space4 | | | |
| Population Density | 2,938.9 | 2,275.1 | 93.4 |
| Land Area | 0.3 | 1.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Poplar, MT | Glasgow, MT | United States |
| Age 0 to 4 | 6.1% | 8.5% | 5.9% |
| Age 5 to 9 | 9.4% | 7.7% | 6.1% |
| Age 10 to 14 | 6.7% | 7.7% | 6.6% |
| Age 15 to 17 | 7.5% | 5.0% | 3.9% |
| Age 18 to 20 | 10.5% | 2.4% | 4.0% |
| Age 21 to 24 | 2.0% | 1.3% | 5.2% |
| Age 25 to 34 | 13.8% | 12.4% | 13.8% |
| Age 35 to 44 | 7.7% | 10.2% | 12.9% |
| Age 45 to 54 | 11.5% | 10.4% | 12.6% |
| Age 55 to 59 | 7.7% | 4.0% | 6.7% |
| Age 60 to 64 | 6.4% | 9.5% | 6.3% |
| Age 65 to 74 | 6.6% | 10.6% | 9.6% |
| Age 75 to 84 | 3.2% | 8.1% | 4.5% |
| Age 85 and over | 0.9% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Poplar, MT | Glasgow, MT | United States |
| White | 16.8% | 90.2% | 59.4% |
| Black | 0.4% | 0.7% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 78.8% | 3.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.0% | 0.4% |
| Two or More Races | 0.7% | 1.1% | 3.2% |
| Hispanic | 2.7% | 4.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Poplar, MT | Glasgow, MT | United States |
| Married Population | 29.3% | 52.4% | 49.8% |
| Currently Married | 28.8% | 50.9% | 48.0% |
| Married but Separated | 0.5% | 1.5% | 1.8% |
| Single Population | 70.7% | 47.6% | 50.2% |
| Never Married | 50.4% | 26.3% | 33.8% |
| Divorced | 15.9% | 13.8% | 10.8% |
| Widowed | 4.4% | 7.5% | 5.6% |
| space5 | | | |
| Household Size | 3.23 | 2.38 | 2.60 |
| Households | 253 | 1,292 | 124,010,992 |
| Family Households | 174 | 757 | 80,755,759 |
| Married couple, w/children | 31.0% | 35.7% | 30.5% |
| Married couple, no children | 19.5% | 42.5% | 42.9% |
| Non Family Households | 79 | 535 | 43,255,233 |
| Single householder, w/children | 36.2% | 14.4% | 15.8% |
| Single householder, no children | 13.2% | 7.4% | 10.8% |