| | Piqua, OH | Oakwood, OH | United States |
| Population | 20,352 | 9,470 | 329,725,481 |
| Female Population | 48.8% | 55.2% | 50.5% |
| Male Population | 51.2% | 44.8% | 49.5% |
| Median Age | 40.2 | 39.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 20,501 | 9,201 | 309,327,143 |
| Population - 2000 | 20,738 | 9,215 | 285,036,114 |
| Population - 1990 | 20,612 | 8,957 | 251,960,433 |
| Pop. 2000 to Now | 3.4% | -3.2% | 15.6% |
| Pop. 1990 to Now | 4.0% | -0.4% | 30.8% |
| space4 | | | |
| Population Density | 1,735.8 | 4,314.4 | 93.4 |
| Land Area | 11.7 | 2.2 | 3,531,905.4 |
| Water Area | 0.3 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Piqua, OH | Oakwood, OH | United States |
| Age 0 to 4 | 5.8% | 5.6% | 5.9% |
| Age 5 to 9 | 5.2% | 5.3% | 6.1% |
| Age 10 to 14 | 8.2% | 12.5% | 6.6% |
| Age 15 to 17 | 3.5% | 6.2% | 3.9% |
| Age 18 to 20 | 3.0% | 1.8% | 4.0% |
| Age 21 to 24 | 5.3% | 1.8% | 5.2% |
| Age 25 to 34 | 13.8% | 11.2% | 13.8% |
| Age 35 to 44 | 11.7% | 13.7% | 12.9% |
| Age 45 to 54 | 11.8% | 19.3% | 12.6% |
| Age 55 to 59 | 7.0% | 5.7% | 6.7% |
| Age 60 to 64 | 8.5% | 4.3% | 6.3% |
| Age 65 to 74 | 9.7% | 7.1% | 9.6% |
| Age 75 to 84 | 5.1% | 3.4% | 4.5% |
| Age 85 and over | 1.4% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Piqua, OH | Oakwood, OH | United States |
| White | 91.5% | 90.8% | 59.4% |
| Black | 2.7% | 0.3% | 12.2% |
| Asian | 0.8% | 3.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 3.4% | 4.2% | 3.2% |
| Hispanic | 1.3% | 1.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Piqua, OH | Oakwood, OH | United States |
| Married Population | 48.4% | 62.2% | 49.8% |
| Currently Married | 46.4% | 61.6% | 48.0% |
| Married but Separated | 2.1% | 0.6% | 1.8% |
| Single Population | 51.6% | 37.8% | 50.2% |
| Never Married | 30.5% | 22.0% | 33.8% |
| Divorced | 14.9% | 10.6% | 10.8% |
| Widowed | 6.1% | 5.2% | 5.6% |
| space5 | | | |
| Household Size | 2.30 | 2.62 | 2.60 |
| Households | 8,725 | 3,613 | 124,010,992 |
| Family Households | 4,894 | 2,676 | 80,755,759 |
| Married couple, w/children | 28.8% | 37.3% | 30.5% |
| Married couple, no children | 45.3% | 44.5% | 42.9% |
| Non Family Households | 3,831 | 937 | 43,255,233 |
| Single householder, w/children | 17.0% | 13.5% | 15.8% |
| Single householder, no children | 8.8% | 4.7% | 10.8% |