| | Piedmont, SD | Deadwood, SD | United States |
| Population | 1,017 | 1,317 | 329,725,481 |
| Female Population | 47.6% | 44.8% | 50.5% |
| Male Population | 52.4% | 55.2% | 49.5% |
| Median Age | 40.6 | 50.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 886 | 1,295 | 309,327,143 |
| Population - 2000 | 178 | 1,380 | 285,036,114 |
| Population - 1990 | 142 | 1,830 | 251,960,433 |
| Pop. 2000 to Now | 402.8% | -6.2% | 15.6% |
| Pop. 1990 to Now | 530.3% | -29.3% | 30.8% |
| space4 | | | |
| Population Density | 772.8 | 267.2 | 93.4 |
| Land Area | 1.3 | 4.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Piedmont, SD | Deadwood, SD | United States |
| Age 0 to 4 | 3.7% | 2.6% | 5.9% |
| Age 5 to 9 | 7.9% | 0.5% | 6.1% |
| Age 10 to 14 | 9.5% | 7.0% | 6.6% |
| Age 15 to 17 | 7.3% | 2.6% | 3.9% |
| Age 18 to 20 | 1.5% | 3.2% | 4.0% |
| Age 21 to 24 | 3.4% | 3.6% | 5.2% |
| Age 25 to 34 | 13.3% | 13.7% | 13.8% |
| Age 35 to 44 | 6.0% | 7.7% | 12.9% |
| Age 45 to 54 | 10.7% | 18.5% | 12.6% |
| Age 55 to 59 | 6.4% | 6.3% | 6.7% |
| Age 60 to 64 | 9.3% | 7.6% | 6.3% |
| Age 65 to 74 | 18.2% | 21.0% | 9.6% |
| Age 75 to 84 | 1.2% | 4.2% | 4.5% |
| Age 85 and over | 1.6% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Piedmont, SD | Deadwood, SD | United States |
| White | 91.0% | 91.8% | 59.4% |
| Black | 3.6% | 0.5% | 12.2% |
| Asian | 0.7% | 0.2% | 5.6% |
| Native American | 0.3% | 1.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.0% | 1.2% | 3.2% |
| Hispanic | 1.4% | 5.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Piedmont, SD | Deadwood, SD | United States |
| Married Population | 62.2% | 42.2% | 49.8% |
| Currently Married | 62.1% | 41.7% | 48.0% |
| Married but Separated | 0.1% | 0.5% | 1.8% |
| Single Population | 37.8% | 57.8% | 50.2% |
| Never Married | 29.3% | 26.3% | 33.8% |
| Divorced | 5.9% | 25.4% | 10.8% |
| Widowed | 2.6% | 6.1% | 5.6% |
| space5 | | | |
| Household Size | 2.40 | 1.86 | 2.60 |
| Households | 424 | 690 | 124,010,992 |
| Family Households | 284 | 304 | 80,755,759 |
| Married couple, w/children | 33.1% | 21.7% | 30.5% |
| Married couple, no children | 55.6% | 52.3% | 42.9% |
| Non Family Households | 140 | 386 | 43,255,233 |
| Single householder, w/children | 8.5% | 19.1% | 15.8% |
| Single householder, no children | 2.8% | 6.9% | 10.8% |