| | McLaughlin, SD | Tripp, SD | United States |
| Population | 539 | 558 | 329,725,481 |
| Female Population | 57.5% | 52.2% | 50.5% |
| Male Population | 42.5% | 47.9% | 49.5% |
| Median Age | 31.3 | 51.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 656 | 646 | 309,327,143 |
| Population - 2000 | 775 | 711 | 285,036,114 |
| Population - 1990 | 780 | 664 | 251,960,433 |
| Pop. 2000 to Now | -17.2% | -13.6% | 15.6% |
| Pop. 1990 to Now | -17.7% | -7.5% | 30.8% |
| space4 | | | |
| Population Density | 1,334.2 | 941.0 | 93.4 |
| Land Area | 0.4 | 0.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | McLaughlin, SD | Tripp, SD | United States |
| Age 0 to 4 | 11.7% | 6.1% | 5.9% |
| Age 5 to 9 | 5.8% | 1.8% | 6.1% |
| Age 10 to 14 | 11.1% | 6.1% | 6.6% |
| Age 15 to 17 | 5.2% | 5.0% | 3.9% |
| Age 18 to 20 | 2.4% | 0.0% | 4.0% |
| Age 21 to 24 | 5.8% | 1.1% | 5.2% |
| Age 25 to 34 | 12.2% | 3.4% | 13.8% |
| Age 35 to 44 | 8.7% | 14.5% | 12.9% |
| Age 45 to 54 | 8.9% | 14.0% | 12.6% |
| Age 55 to 59 | 10.2% | 12.5% | 6.7% |
| Age 60 to 64 | 8.2% | 3.6% | 6.3% |
| Age 65 to 74 | 6.9% | 13.4% | 9.6% |
| Age 75 to 84 | 2.2% | 7.2% | 4.5% |
| Age 85 and over | 0.7% | 11.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | McLaughlin, SD | Tripp, SD | United States |
| White | 28.4% | 94.3% | 59.4% |
| Black | 0.6% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 71.1% | 2.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 1.8% | 3.2% |
| Hispanic | 0.0% | 1.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | McLaughlin, SD | Tripp, SD | United States |
| Married Population | 34.3% | 55.0% | 49.8% |
| Currently Married | 32.2% | 53.8% | 48.0% |
| Married but Separated | 2.1% | 1.3% | 1.8% |
| Single Population | 65.7% | 45.0% | 50.2% |
| Never Married | 47.5% | 13.8% | 33.8% |
| Divorced | 12.7% | 9.4% | 10.8% |
| Widowed | 5.5% | 21.9% | 5.6% |
| space5 | | | |
| Household Size | 3.43 | 1.83 | 2.60 |
| Households | 157 | 283 | 124,010,992 |
| Family Households | 103 | 135 | 80,755,759 |
| Married couple, w/children | 27.2% | 34.8% | 30.5% |
| Married couple, no children | 26.2% | 54.1% | 42.9% |
| Non Family Households | 54 | 148 | 43,255,233 |
| Single householder, w/children | 33.0% | 11.1% | 15.8% |
| Single householder, no children | 13.6% | 0.0% | 10.8% |