| | Somerset, OH | Heath, OH | United States |
| Population | 1,743 | 10,429 | 329,725,481 |
| Female Population | 52.6% | 54.0% | 50.5% |
| Male Population | 47.5% | 46.1% | 49.5% |
| Median Age | 34.5 | 42.3 | 38.4 |
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| Population - 2010 | 1,492 | 10,306 | 309,327,143 |
| Population - 2000 | 1,549 | 8,527 | 285,036,114 |
| Population - 1990 | 1,138 | 7,231 | 251,960,433 |
| Pop. 2000 to Now | -5.4% | 29.4% | 15.6% |
| Pop. 1990 to Now | 28.7% | 52.6% | 30.8% |
| space4 | | | |
| Population Density | 1,496.1 | 972.0 | 93.4 |
| Land Area | 1.2 | 10.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Somerset, OH | Heath, OH | United States |
| Age 0 to 4 | 3.4% | 5.7% | 5.9% |
| Age 5 to 9 | 6.3% | 5.4% | 6.1% |
| Age 10 to 14 | 10.6% | 8.4% | 6.6% |
| Age 15 to 17 | 10.4% | 4.7% | 3.9% |
| Age 18 to 20 | 5.0% | 2.3% | 4.0% |
| Age 21 to 24 | 4.5% | 4.0% | 5.2% |
| Age 25 to 34 | 10.5% | 10.0% | 13.8% |
| Age 35 to 44 | 11.9% | 12.6% | 12.9% |
| Age 45 to 54 | 9.9% | 12.5% | 12.6% |
| Age 55 to 59 | 5.0% | 5.7% | 6.7% |
| Age 60 to 64 | 7.0% | 6.5% | 6.3% |
| Age 65 to 74 | 5.9% | 11.5% | 9.6% |
| Age 75 to 84 | 7.0% | 7.0% | 4.5% |
| Age 85 and over | 2.6% | 3.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Somerset, OH | Heath, OH | United States |
| White | 89.7% | 89.7% | 59.4% |
| Black | 1.4% | 3.3% | 12.2% |
| Asian | 0.0% | 0.9% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 6.3% | 2.9% | 3.2% |
| Hispanic | 2.6% | 3.1% | 18.4% |
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| Marriage & Family | | | |
| | Somerset, OH | Heath, OH | United States |
| Married Population | 36.1% | 48.6% | 49.8% |
| Currently Married | 35.4% | 47.3% | 48.0% |
| Married but Separated | 0.6% | 1.3% | 1.8% |
| Single Population | 63.9% | 51.4% | 50.2% |
| Never Married | 40.3% | 25.5% | 33.8% |
| Divorced | 12.7% | 15.5% | 10.8% |
| Widowed | 10.9% | 10.4% | 5.6% |
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| Household Size | 2.71 | 2.49 | 2.60 |
| Households | 619 | 4,125 | 124,010,992 |
| Family Households | 340 | 2,515 | 80,755,759 |
| Married couple, w/children | 35.6% | 28.8% | 30.5% |
| Married couple, no children | 26.5% | 46.2% | 42.9% |
| Non Family Households | 279 | 1,610 | 43,255,233 |
| Single householder, w/children | 27.1% | 16.5% | 15.8% |
| Single householder, no children | 10.9% | 8.4% | 10.8% |