| | Etna, OH | Gahanna, OH | United States |
| Population | 812 | 35,626 | 329,725,481 |
| Female Population | 53.9% | 52.0% | 50.5% |
| Male Population | 46.1% | 48.0% | 49.5% |
| Median Age | 40.1 | 39.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 987 | 33,274 | 309,327,143 |
| Population - 2000 | 440 | 32,636 | 285,036,114 |
| Population - 1990 | 346 | 27,791 | 251,960,433 |
| Pop. 2000 to Now | 110.9% | 8.9% | 15.6% |
| Pop. 1990 to Now | 168.2% | 27.9% | 30.8% |
| space4 | | | |
| Population Density | 1,278.7 | 2,866.6 | 93.4 |
| Land Area | 0.6 | 12.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Etna, OH | Gahanna, OH | United States |
| Age 0 to 4 | 13.8% | 5.3% | 5.9% |
| Age 5 to 9 | 6.0% | 5.9% | 6.1% |
| Age 10 to 14 | 11.2% | 7.3% | 6.6% |
| Age 15 to 17 | 1.5% | 5.5% | 3.9% |
| Age 18 to 20 | 2.0% | 2.8% | 4.0% |
| Age 21 to 24 | 4.4% | 3.2% | 5.2% |
| Age 25 to 34 | 10.5% | 13.4% | 13.8% |
| Age 35 to 44 | 18.1% | 14.0% | 12.9% |
| Age 45 to 54 | 28.4% | 12.9% | 12.6% |
| Age 55 to 59 | 0.0% | 6.6% | 6.7% |
| Age 60 to 64 | 1.4% | 6.8% | 6.3% |
| Age 65 to 74 | 1.4% | 10.8% | 9.6% |
| Age 75 to 84 | 1.4% | 3.7% | 4.5% |
| Age 85 and over | 0.0% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Etna, OH | Gahanna, OH | United States |
| White | 76.7% | 75.3% | 59.4% |
| Black | 5.9% | 12.7% | 12.2% |
| Asian | 0.0% | 3.6% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.0% | 0.4% |
| Two or More Races | 17.4% | 4.5% | 3.2% |
| Hispanic | 0.0% | 2.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Etna, OH | Gahanna, OH | United States |
| Married Population | 65.5% | 57.1% | 49.8% |
| Currently Married | 65.5% | 55.1% | 48.0% |
| Married but Separated | 0.0% | 1.9% | 1.8% |
| Single Population | 34.5% | 42.9% | 50.2% |
| Never Married | 27.7% | 27.7% | 33.8% |
| Divorced | 4.8% | 9.6% | 10.8% |
| Widowed | 2.0% | 5.6% | 5.6% |
| space5 | | | |
| Household Size | 2.92 | 2.48 | 2.60 |
| Households | 278 | 14,304 | 124,010,992 |
| Family Households | 214 | 9,970 | 80,755,759 |
| Married couple, w/children | 65.4% | 32.7% | 30.5% |
| Married couple, no children | 22.0% | 45.7% | 42.9% |
| Non Family Households | 64 | 4,334 | 43,255,233 |
| Single householder, w/children | 12.6% | 14.0% | 15.8% |
| Single householder, no children | 0.0% | 7.6% | 10.8% |