| | Jefferson, OH | Seward, AK | United States |
| Population | 3,350 | 2,614 | 329,725,481 |
| Female Population | 51.0% | 37.4% | 50.5% |
| Male Population | 49.0% | 62.6% | 49.5% |
| Median Age | 50.1 | 43.5 | 38.4 |
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| Population - 2010 | 3,115 | 2,727 | 309,327,143 |
| Population - 2000 | 3,572 | 2,830 | 285,036,114 |
| Population - 1990 | 3,331 | 2,699 | 251,960,433 |
| Pop. 2000 to Now | -16.7% | 3.4% | 15.6% |
| Pop. 1990 to Now | -10.6% | 8.5% | 30.8% |
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| Population Density | 1,320.5 | 187.3 | 93.4 |
| Land Area | 2.5 | 14.0 | 3,531,905.4 |
| Water Area | 0.0 | 7.9 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Jefferson, OH | Seward, AK | United States |
| Age 0 to 4 | 2.4% | 4.4% | 5.9% |
| Age 5 to 9 | 3.5% | 4.6% | 6.1% |
| Age 10 to 14 | 7.2% | 7.9% | 6.6% |
| Age 15 to 17 | 8.7% | 2.4% | 3.9% |
| Age 18 to 20 | 6.2% | 1.3% | 4.0% |
| Age 21 to 24 | 3.4% | 4.2% | 5.2% |
| Age 25 to 34 | 8.4% | 15.3% | 13.8% |
| Age 35 to 44 | 6.5% | 14.6% | 12.9% |
| Age 45 to 54 | 13.6% | 14.7% | 12.6% |
| Age 55 to 59 | 7.3% | 4.8% | 6.7% |
| Age 60 to 64 | 7.8% | 10.2% | 6.3% |
| Age 65 to 74 | 12.4% | 10.3% | 9.6% |
| Age 75 to 84 | 6.2% | 2.0% | 4.5% |
| Age 85 and over | 6.2% | 3.3% | 1.9% |
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| Race | | | |
| | Jefferson, OH | Seward, AK | United States |
| White | 90.0% | 62.5% | 59.4% |
| Black | 0.9% | 2.7% | 12.2% |
| Asian | 0.9% | 1.3% | 5.6% |
| Native American | 0.0% | 14.9% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 4.6% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 4.6% | 3.2% |
| Hispanic | 6.9% | 9.3% | 18.4% |
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| Marriage & Family | | | |
| | Jefferson, OH | Seward, AK | United States |
| Married Population | 35.7% | 41.3% | 49.8% |
| Currently Married | 35.7% | 39.3% | 48.0% |
| Married but Separated | 0.0% | 2.0% | 1.8% |
| Single Population | 64.3% | 58.7% | 50.2% |
| Never Married | 25.4% | 41.2% | 33.8% |
| Divorced | 20.2% | 9.3% | 10.8% |
| Widowed | 18.7% | 8.1% | 5.6% |
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| Household Size | 2.09 | 2.19 | 2.60 |
| Households | 1,519 | 977 | 124,010,992 |
| Family Households | 611 | 545 | 80,755,759 |
| Married couple, w/children | 26.7% | 22.6% | 30.5% |
| Married couple, no children | 49.6% | 49.7% | 42.9% |
| Non Family Households | 908 | 432 | 43,255,233 |
| Single householder, w/children | 22.6% | 22.8% | 15.8% |
| Single householder, no children | 1.1% | 5.0% | 10.8% |