| | Wauseon, OH | Wilmington, OH | United States |
| Population | 7,277 | 12,523 | 329,725,481 |
| Female Population | 52.4% | 54.2% | 50.5% |
| Male Population | 47.6% | 45.8% | 49.5% |
| Median Age | 37.8 | 35.7 | 38.4 |
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| Population - 2010 | 7,400 | 12,542 | 309,327,143 |
| Population - 2000 | 7,091 | 11,921 | 285,036,114 |
| Population - 1990 | 6,322 | 11,199 | 251,960,433 |
| Pop. 2000 to Now | 4.5% | 4.0% | 15.6% |
| Pop. 1990 to Now | 17.2% | 10.7% | 30.8% |
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| Population Density | 1,368.1 | 1,150.0 | 93.4 |
| Land Area | 5.3 | 10.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Wauseon, OH | Wilmington, OH | United States |
| Age 0 to 4 | 6.8% | 7.3% | 5.9% |
| Age 5 to 9 | 7.4% | 6.1% | 6.1% |
| Age 10 to 14 | 8.4% | 6.1% | 6.6% |
| Age 15 to 17 | 5.8% | 3.0% | 3.9% |
| Age 18 to 20 | 5.5% | 7.7% | 4.0% |
| Age 21 to 24 | 3.2% | 7.6% | 5.2% |
| Age 25 to 34 | 10.5% | 12.0% | 13.8% |
| Age 35 to 44 | 15.6% | 9.3% | 12.9% |
| Age 45 to 54 | 12.9% | 10.8% | 12.6% |
| Age 55 to 59 | 4.9% | 6.0% | 6.7% |
| Age 60 to 64 | 4.3% | 6.6% | 6.3% |
| Age 65 to 74 | 6.4% | 9.2% | 9.6% |
| Age 75 to 84 | 5.2% | 5.6% | 4.5% |
| Age 85 and over | 3.2% | 2.7% | 1.9% |
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| Race | | | |
| | Wauseon, OH | Wilmington, OH | United States |
| White | 83.8% | 87.1% | 59.4% |
| Black | 0.4% | 4.0% | 12.2% |
| Asian | 0.6% | 1.1% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.5% | 0.4% |
| Two or More Races | 2.6% | 4.6% | 3.2% |
| Hispanic | 12.8% | 2.7% | 18.4% |
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| Marriage & Family | | | |
| | Wauseon, OH | Wilmington, OH | United States |
| Married Population | 53.6% | 39.5% | 49.8% |
| Currently Married | 50.8% | 37.2% | 48.0% |
| Married but Separated | 2.8% | 2.3% | 1.8% |
| Single Population | 46.4% | 60.5% | 50.2% |
| Never Married | 30.8% | 35.9% | 33.8% |
| Divorced | 8.7% | 15.3% | 10.8% |
| Widowed | 6.9% | 9.3% | 5.6% |
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| Household Size | 2.62 | 2.16 | 2.60 |
| Households | 2,736 | 5,298 | 124,010,992 |
| Family Households | 1,914 | 2,850 | 80,755,759 |
| Married couple, w/children | 40.0% | 21.3% | 30.5% |
| Married couple, no children | 36.1% | 39.7% | 42.9% |
| Non Family Households | 822 | 2,448 | 43,255,233 |
| Single householder, w/children | 14.6% | 26.9% | 15.8% |
| Single householder, no children | 9.3% | 12.1% | 10.8% |