| | Walshtown, SD | Black Forest, CO | United States |
| Population | 89 | 14,375 | 329,725,481 |
| Female Population | 34.8% | 49.9% | 50.5% |
| Male Population | 65.2% | 50.1% | 49.5% |
| Median Age | 55.9 | 48 | 38.4 |
| space3 | | | |
| Population - 2010 | 157 | 13,454 | 309,327,143 |
| Population - 2000 | 195 | 13,247 | 285,036,114 |
| Population - 1990 | 214 | 8,143 | 251,960,433 |
| Pop. 2000 to Now | -18.5% | 15.7% | 15.6% |
| Pop. 1990 to Now | -25.7% | 88.3% | 30.8% |
| space4 | | | |
| Population Density | 2.5 | 142.8 | 93.4 |
| Land Area | 36.3 | 100.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Walshtown, SD | Black Forest, CO | United States |
| Age 0 to 4 | 3.4% | 3.8% | 5.9% |
| Age 5 to 9 | 0.0% | 5.0% | 6.1% |
| Age 10 to 14 | 0.0% | 8.8% | 6.6% |
| Age 15 to 17 | 0.0% | 5.9% | 3.9% |
| Age 18 to 20 | 0.0% | 3.9% | 4.0% |
| Age 21 to 24 | 0.0% | 2.9% | 5.2% |
| Age 25 to 34 | 37.1% | 4.6% | 13.8% |
| Age 35 to 44 | 4.5% | 11.0% | 12.9% |
| Age 45 to 54 | 0.0% | 16.2% | 12.6% |
| Age 55 to 59 | 11.2% | 9.6% | 6.7% |
| Age 60 to 64 | 18.0% | 11.2% | 6.3% |
| Age 65 to 74 | 20.2% | 13.0% | 9.6% |
| Age 75 to 84 | 0.0% | 3.4% | 4.5% |
| Age 85 and over | 5.6% | 0.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Walshtown, SD | Black Forest, CO | United States |
| White | 100.0% | 85.0% | 59.4% |
| Black | 0.0% | 4.5% | 12.2% |
| Asian | 0.0% | 2.5% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 1.9% | 3.2% |
| Hispanic | 0.0% | 5.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Walshtown, SD | Black Forest, CO | United States |
| Married Population | 51.2% | 66.6% | 49.8% |
| Currently Married | 51.2% | 65.4% | 48.0% |
| Married but Separated | 0.0% | 1.2% | 1.8% |
| Single Population | 48.8% | 33.4% | 50.2% |
| Never Married | 43.0% | 22.1% | 33.8% |
| Divorced | 0.0% | 7.8% | 10.8% |
| Widowed | 5.8% | 3.5% | 5.6% |
| space5 | | | |
| Household Size | 2.07 | 2.81 | 2.60 |
| Households | 43 | 5,122 | 124,010,992 |
| Family Households | 23 | 4,076 | 80,755,759 |
| Married couple, w/children | 26.1% | 36.1% | 30.5% |
| Married couple, no children | 73.9% | 54.4% | 42.9% |
| Non Family Households | 20 | 1,046 | 43,255,233 |
| Single householder, w/children | 0.0% | 3.4% | 15.8% |
| Single householder, no children | 0.0% | 6.0% | 10.8% |