| | Little Eagle, SD | Fort Yates, ND | United States |
| Population | 352 | 195 | 329,725,481 |
| Female Population | 57.7% | 39.5% | 50.5% |
| Male Population | 42.3% | 60.5% | 49.5% |
| Median Age | 20.5 | 29.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 231 | 179 | 309,327,143 |
| Population - 2000 | 370 | 228 | 285,036,114 |
| Population - 1990 | 294 | 183 | 251,960,433 |
| Pop. 2000 to Now | -13.0% | -13.2% | 15.6% |
| Pop. 1990 to Now | 9.5% | 8.2% | 30.8% |
| space4 | | | |
| Population Density | 251.8 | 3,250.0 | 93.4 |
| Land Area | 1.4 | 0.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Little Eagle, SD | Fort Yates, ND | United States |
| Age 0 to 4 | 22.4% | 5.1% | 5.9% |
| Age 5 to 9 | 6.3% | 7.2% | 6.1% |
| Age 10 to 14 | 13.4% | 15.9% | 6.6% |
| Age 15 to 17 | 4.0% | 5.6% | 3.9% |
| Age 18 to 20 | 4.5% | 3.1% | 4.0% |
| Age 21 to 24 | 4.3% | 7.7% | 5.2% |
| Age 25 to 34 | 10.2% | 10.3% | 13.8% |
| Age 35 to 44 | 19.3% | 12.8% | 12.9% |
| Age 45 to 54 | 6.8% | 16.9% | 12.6% |
| Age 55 to 59 | 1.7% | 7.7% | 6.7% |
| Age 60 to 64 | 2.6% | 3.6% | 6.3% |
| Age 65 to 74 | 3.7% | 2.1% | 9.6% |
| Age 75 to 84 | 0.9% | 2.1% | 4.5% |
| Age 85 and over | 0.0% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Little Eagle, SD | Fort Yates, ND | United States |
| White | 1.4% | 1.5% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 97.7% | 94.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 4.1% | 3.2% |
| Hispanic | 0.9% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Little Eagle, SD | Fort Yates, ND | United States |
| Married Population | 20.6% | 17.1% | 49.8% |
| Currently Married | 17.2% | 17.1% | 48.0% |
| Married but Separated | 3.4% | 0.0% | 1.8% |
| Single Population | 79.4% | 82.9% | 50.2% |
| Never Married | 63.7% | 58.6% | 33.8% |
| Divorced | 6.9% | 17.1% | 10.8% |
| Widowed | 8.8% | 7.1% | 5.6% |
| space5 | | | |
| Household Size | 5.33 | 3.55 | 2.60 |
| Households | 66 | 55 | 124,010,992 |
| Family Households | 56 | 41 | 80,755,759 |
| Married couple, w/children | 14.3% | 19.5% | 30.5% |
| Married couple, no children | 5.4% | 9.8% | 42.9% |
| Non Family Households | 10 | 14 | 43,255,233 |
| Single householder, w/children | 51.8% | 31.7% | 15.8% |
| Single householder, no children | 28.6% | 39.0% | 10.8% |