| | Washington Court House, OH | New Franklin, OH | United States |
| Population | 14,440 | 13,913 | 329,725,481 |
| Female Population | 50.8% | 50.1% | 50.5% |
| Male Population | 49.3% | 49.9% | 49.5% |
| Median Age | 36.9 | 48.6 | 38.4 |
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| Population - 2010 | 14,230 | 14,211 | 309,327,143 |
| Population - 2000 | 13,784 | 2,191 | 285,036,114 |
| Population - 1990 | 13,300 | 14,566 | 251,960,433 |
| Pop. 2000 to Now | 3.0% | 543.6% | 15.6% |
| Pop. 1990 to Now | 6.7% | -3.2% | 30.8% |
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| Population Density | 1,642.4 | 556.8 | 93.4 |
| Land Area | 8.8 | 25.0 | 3,531,905.4 |
| Water Area | 0.1 | 1.6 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Washington Court House, OH | New Franklin, OH | United States |
| Age 0 to 4 | 7.0% | 5.3% | 5.9% |
| Age 5 to 9 | 6.4% | 6.1% | 6.1% |
| Age 10 to 14 | 7.9% | 4.1% | 6.6% |
| Age 15 to 17 | 4.6% | 2.7% | 3.9% |
| Age 18 to 20 | 3.3% | 2.4% | 4.0% |
| Age 21 to 24 | 4.8% | 3.0% | 5.2% |
| Age 25 to 34 | 14.1% | 12.5% | 13.8% |
| Age 35 to 44 | 10.9% | 9.9% | 12.9% |
| Age 45 to 54 | 11.4% | 14.3% | 12.6% |
| Age 55 to 59 | 6.6% | 9.4% | 6.7% |
| Age 60 to 64 | 6.4% | 8.9% | 6.3% |
| Age 65 to 74 | 10.4% | 12.6% | 9.6% |
| Age 75 to 84 | 4.6% | 4.8% | 4.5% |
| Age 85 and over | 1.6% | 4.0% | 1.9% |
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| Race | | | |
| | Washington Court House, OH | New Franklin, OH | United States |
| White | 90.5% | 94.9% | 59.4% |
| Black | 3.0% | 0.9% | 12.2% |
| Asian | 1.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.4% | 0.4% |
| Two or More Races | 2.8% | 3.4% | 3.2% |
| Hispanic | 2.5% | 0.5% | 18.4% |
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| Marriage & Family | | | |
| | Washington Court House, OH | New Franklin, OH | United States |
| Married Population | 45.2% | 62.2% | 49.8% |
| Currently Married | 42.3% | 61.3% | 48.0% |
| Married but Separated | 2.8% | 0.9% | 1.8% |
| Single Population | 54.8% | 37.8% | 50.2% |
| Never Married | 30.0% | 20.9% | 33.8% |
| Divorced | 15.7% | 10.8% | 10.8% |
| Widowed | 9.1% | 6.1% | 5.6% |
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| Household Size | 2.42 | 2.46 | 2.60 |
| Households | 5,872 | 5,614 | 124,010,992 |
| Family Households | 3,547 | 4,210 | 80,755,759 |
| Married couple, w/children | 29.6% | 24.6% | 30.5% |
| Married couple, no children | 33.9% | 57.6% | 42.9% |
| Non Family Households | 2,325 | 1,404 | 43,255,233 |
| Single householder, w/children | 25.0% | 8.7% | 15.8% |
| Single householder, no children | 11.6% | 9.2% | 10.8% |