| | Geneva, IN | Bluffton, IN | United States |
| Population | 1,165 | 10,548 | 329,725,481 |
| Female Population | 49.1% | 52.3% | 50.5% |
| Male Population | 50.9% | 47.7% | 49.5% |
| Median Age | 52.5 | 37.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,307 | 9,911 | 309,327,143 |
| Population - 2000 | 1,368 | 9,536 | 285,036,114 |
| Population - 1990 | 1,280 | 9,020 | 251,960,433 |
| Pop. 2000 to Now | -0.4% | 5.9% | 15.6% |
| Pop. 1990 to Now | 6.4% | 11.9% | 30.8% |
| space4 | | | |
| Population Density | 1,072.7 | 1,282.6 | 93.4 |
| Land Area | 1.1 | 8.2 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Geneva, IN | Bluffton, IN | United States |
| Age 0 to 4 | 2.1% | 6.3% | 5.9% |
| Age 5 to 9 | 5.5% | 7.5% | 6.1% |
| Age 10 to 14 | 8.7% | 7.3% | 6.6% |
| Age 15 to 17 | 4.4% | 4.3% | 3.9% |
| Age 18 to 20 | 1.2% | 4.2% | 4.0% |
| Age 21 to 24 | 2.8% | 5.9% | 5.2% |
| Age 25 to 34 | 6.8% | 11.1% | 13.8% |
| Age 35 to 44 | 9.3% | 12.6% | 12.9% |
| Age 45 to 54 | 15.5% | 11.3% | 12.6% |
| Age 55 to 59 | 11.5% | 7.3% | 6.7% |
| Age 60 to 64 | 10.5% | 5.6% | 6.3% |
| Age 65 to 74 | 12.6% | 9.5% | 9.6% |
| Age 75 to 84 | 6.1% | 4.2% | 4.5% |
| Age 85 and over | 3.0% | 2.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Geneva, IN | Bluffton, IN | United States |
| White | 85.8% | 90.4% | 59.4% |
| Black | 0.7% | 2.2% | 12.2% |
| Asian | 0.0% | 0.2% | 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 | 1.5% | 2.2% | 3.2% |
| Hispanic | 11.9% | 5.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Geneva, IN | Bluffton, IN | United States |
| Married Population | 55.1% | 52.0% | 49.8% |
| Currently Married | 53.7% | 50.2% | 48.0% |
| Married but Separated | 1.3% | 1.8% | 1.8% |
| Single Population | 44.9% | 48.0% | 50.2% |
| Never Married | 21.0% | 27.9% | 33.8% |
| Divorced | 17.8% | 14.0% | 10.8% |
| Widowed | 6.1% | 6.1% | 5.6% |
| space5 | | | |
| Household Size | 2.27 | 2.38 | 2.60 |
| Households | 477 | 4,322 | 124,010,992 |
| Family Households | 324 | 2,564 | 80,755,759 |
| Married couple, w/children | 20.4% | 34.6% | 30.5% |
| Married couple, no children | 56.5% | 43.6% | 42.9% |
| Non Family Households | 153 | 1,758 | 43,255,233 |
| Single householder, w/children | 17.6% | 15.4% | 15.8% |
| Single householder, no children | 5.6% | 6.4% | 10.8% |