| | Oregon, OH | Waterville, OH | United States |
| Population | 19,935 | 5,943 | 329,725,481 |
| Female Population | 51.4% | 49.1% | 50.5% |
| Male Population | 48.6% | 50.9% | 49.5% |
| Median Age | 45.3 | 45.4 | 38.4 |
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| Population - 2010 | 20,321 | 5,508 | 309,327,143 |
| Population - 2000 | 19,355 | 4,828 | 285,036,114 |
| Population - 1990 | 18,334 | 4,517 | 251,960,433 |
| Pop. 2000 to Now | 3.4% | 15.9% | 15.6% |
| Pop. 1990 to Now | 9.2% | 23.9% | 30.8% |
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| Population Density | 693.3 | 1,167.6 | 93.4 |
| Land Area | 28.8 | 5.1 | 3,531,905.4 |
| Water Area | 0.1 | 0.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Oregon, OH | Waterville, OH | United States |
| Age 0 to 4 | 3.9% | 3.9% | 5.9% |
| Age 5 to 9 | 3.9% | 5.7% | 6.1% |
| Age 10 to 14 | 6.1% | 7.6% | 6.6% |
| Age 15 to 17 | 4.9% | 7.0% | 3.9% |
| Age 18 to 20 | 3.1% | 0.7% | 4.0% |
| Age 21 to 24 | 4.3% | 2.3% | 5.2% |
| Age 25 to 34 | 12.6% | 8.3% | 13.8% |
| Age 35 to 44 | 11.0% | 13.8% | 12.9% |
| Age 45 to 54 | 12.1% | 11.8% | 12.6% |
| Age 55 to 59 | 8.5% | 5.9% | 6.7% |
| Age 60 to 64 | 7.9% | 11.4% | 6.3% |
| Age 65 to 74 | 11.6% | 13.1% | 9.6% |
| Age 75 to 84 | 6.6% | 3.5% | 4.5% |
| Age 85 and over | 3.6% | 5.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Oregon, OH | Waterville, OH | United States |
| White | 85.8% | 88.7% | 59.4% |
| Black | 2.0% | 0.4% | 12.2% |
| Asian | 1.2% | 0.2% | 5.6% |
| Native American | 0.1% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.9% | 4.1% | 3.2% |
| Hispanic | 8.9% | 6.4% | 18.4% |
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| Marriage & Family | | | |
| | Oregon, OH | Waterville, OH | United States |
| Married Population | 51.3% | 53.5% | 49.8% |
| Currently Married | 50.4% | 52.9% | 48.0% |
| Married but Separated | 0.9% | 0.6% | 1.8% |
| Single Population | 48.7% | 46.5% | 50.2% |
| Never Married | 28.5% | 25.9% | 33.8% |
| Divorced | 11.6% | 10.5% | 10.8% |
| Widowed | 8.6% | 10.1% | 5.6% |
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| Household Size | 2.37 | 2.35 | 2.60 |
| Households | 8,274 | 2,482 | 124,010,992 |
| Family Households | 5,441 | 1,512 | 80,755,759 |
| Married couple, w/children | 26.2% | 32.8% | 30.5% |
| Married couple, no children | 49.1% | 45.0% | 42.9% |
| Non Family Households | 2,833 | 970 | 43,255,233 |
| Single householder, w/children | 11.3% | 10.4% | 15.8% |
| Single householder, no children | 13.3% | 11.8% | 10.8% |