| | Gallipolis, OH | Orlando, FL | United States |
| Population | 3,348 | 302,968 | 329,725,481 |
| Female Population | 51.6% | 51.5% | 50.5% |
| Male Population | 48.4% | 48.5% | 49.5% |
| Median Age | 41.5 | 34.4 | 38.4 |
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| Population - 2010 | 3,652 | 239,219 | 309,327,143 |
| Population - 2000 | 4,180 | 185,951 | 285,036,114 |
| Population - 1990 | 4,831 | 164,693 | 251,960,433 |
| Pop. 2000 to Now | -15.2% | 55.7% | 15.6% |
| Pop. 1990 to Now | -26.6% | 75.8% | 30.8% |
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| Population Density | 930.8 | 2,751.2 | 93.4 |
| Land Area | 3.6 | 110.1 | 3,531,905.4 |
| Water Area | 0.2 | 8.7 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Gallipolis, OH | Orlando, FL | United States |
| Age 0 to 4 | 9.8% | 6.7% | 5.9% |
| Age 5 to 9 | 6.8% | 5.8% | 6.1% |
| Age 10 to 14 | 3.4% | 5.3% | 6.6% |
| Age 15 to 17 | 1.0% | 3.4% | 3.9% |
| Age 18 to 20 | 1.6% | 2.5% | 4.0% |
| Age 21 to 24 | 5.1% | 5.5% | 5.2% |
| Age 25 to 34 | 18.5% | 22.0% | 13.8% |
| Age 35 to 44 | 4.3% | 16.0% | 12.9% |
| Age 45 to 54 | 8.3% | 12.0% | 12.6% |
| Age 55 to 59 | 4.8% | 5.7% | 6.7% |
| Age 60 to 64 | 8.9% | 4.6% | 6.3% |
| Age 65 to 74 | 15.2% | 6.6% | 9.6% |
| Age 75 to 84 | 9.8% | 2.8% | 4.5% |
| Age 85 and over | 2.6% | 1.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Gallipolis, OH | Orlando, FL | United States |
| White | 85.8% | 35.0% | 59.4% |
| Black | 4.1% | 22.5% | 12.2% |
| Asian | 2.4% | 3.9% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.9% | 0.4% |
| Two or More Races | 2.7% | 3.5% | 3.2% |
| Hispanic | 5.0% | 34.2% | 18.4% |
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| Marriage & Family | | | |
| | Gallipolis, OH | Orlando, FL | United States |
| Married Population | 43.0% | 40.2% | 49.8% |
| Currently Married | 41.2% | 37.8% | 48.0% |
| Married but Separated | 1.8% | 2.4% | 1.8% |
| Single Population | 57.0% | 59.8% | 50.2% |
| Never Married | 27.5% | 43.2% | 33.8% |
| Divorced | 13.8% | 12.7% | 10.8% |
| Widowed | 15.7% | 3.9% | 5.6% |
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| Household Size | 2.14 | 2.53 | 2.60 |
| Households | 1,521 | 118,834 | 124,010,992 |
| Family Households | 718 | 65,783 | 80,755,759 |
| Married couple, w/children | 26.0% | 29.9% | 30.5% |
| Married couple, no children | 46.7% | 34.0% | 42.9% |
| Non Family Households | 803 | 53,051 | 43,255,233 |
| Single householder, w/children | 10.0% | 20.8% | 15.8% |
| Single householder, no children | 17.3% | 15.3% | 10.8% |