| | New Madison, OH | Eldorado, OH | United States |
| Population | 1,216 | 656 | 329,725,481 |
| Female Population | 50.9% | 50.8% | 50.5% |
| Male Population | 49.1% | 49.2% | 49.5% |
| Median Age | 38.1 | 29.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 893 | 510 | 309,327,143 |
| Population - 2000 | 817 | 543 | 285,036,114 |
| Population - 1990 | 928 | 549 | 251,960,433 |
| Pop. 2000 to Now | 55.8% | -9.8% | 15.6% |
| Pop. 1990 to Now | 37.2% | -10.8% | 30.8% |
| space4 | | | |
| Population Density | 2,965.9 | 2,864.6 | 93.4 |
| Land Area | 0.4 | 0.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | New Madison, OH | Eldorado, OH | United States |
| Age 0 to 4 | 5.3% | 7.5% | 5.9% |
| Age 5 to 9 | 6.2% | 7.9% | 6.1% |
| Age 10 to 14 | 10.8% | 1.5% | 6.6% |
| Age 15 to 17 | 6.1% | 5.5% | 3.9% |
| Age 18 to 20 | 1.0% | 8.7% | 4.0% |
| Age 21 to 24 | 2.5% | 2.3% | 5.2% |
| Age 25 to 34 | 14.0% | 21.5% | 13.8% |
| Age 35 to 44 | 16.4% | 9.8% | 12.9% |
| Age 45 to 54 | 9.0% | 14.2% | 12.6% |
| Age 55 to 59 | 6.4% | 5.3% | 6.7% |
| Age 60 to 64 | 5.0% | 2.9% | 6.3% |
| Age 65 to 74 | 9.2% | 8.5% | 9.6% |
| Age 75 to 84 | 6.7% | 2.1% | 4.5% |
| Age 85 and over | 1.4% | 2.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | New Madison, OH | Eldorado, OH | United States |
| White | 94.8% | 93.0% | 59.4% |
| Black | 0.0% | 0.9% | 12.2% |
| Asian | 0.0% | 0.0% | 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 | 3.8% | 6.1% | 3.2% |
| Hispanic | 1.4% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | New Madison, OH | Eldorado, OH | United States |
| Married Population | 51.5% | 50.8% | 49.8% |
| Currently Married | 49.7% | 49.0% | 48.0% |
| Married but Separated | 1.8% | 1.8% | 1.8% |
| Single Population | 48.5% | 49.2% | 50.2% |
| Never Married | 30.9% | 27.0% | 33.8% |
| Divorced | 11.4% | 13.4% | 10.8% |
| Widowed | 6.1% | 8.8% | 5.6% |
| space5 | | | |
| Household Size | 2.59 | 2.56 | 2.60 |
| Households | 470 | 256 | 124,010,992 |
| Family Households | 323 | 155 | 80,755,759 |
| Married couple, w/children | 30.3% | 43.2% | 30.5% |
| Married couple, no children | 41.2% | 36.8% | 42.9% |
| Non Family Households | 147 | 101 | 43,255,233 |
| Single householder, w/children | 22.0% | 16.1% | 15.8% |
| Single householder, no children | 6.5% | 3.9% | 10.8% |