| | Trenton, OH | Middletown, OH | United States |
| Population | 12,973 | 50,114 | 329,725,481 |
| Female Population | 52.4% | 52.5% | 50.5% |
| Male Population | 47.6% | 47.5% | 49.5% |
| Median Age | 32.1 | 38.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 11,946 | 48,739 | 309,327,143 |
| Population - 2000 | 8,746 | 51,605 | 285,036,114 |
| Population - 1990 | 6,189 | 46,022 | 251,960,433 |
| Pop. 2000 to Now | 52.5% | -5.2% | 15.6% |
| Pop. 1990 to Now | 115.5% | 6.3% | 30.8% |
| space4 | | | |
| Population Density | 2,845.6 | 1,917.0 | 93.4 |
| Land Area | 4.6 | 26.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Trenton, OH | Middletown, OH | United States |
| Age 0 to 4 | 6.4% | 5.4% | 5.9% |
| Age 5 to 9 | 5.5% | 6.3% | 6.1% |
| Age 10 to 14 | 9.6% | 6.9% | 6.6% |
| Age 15 to 17 | 8.4% | 3.2% | 3.9% |
| Age 18 to 20 | 6.2% | 3.3% | 4.0% |
| Age 21 to 24 | 4.9% | 7.8% | 5.2% |
| Age 25 to 34 | 10.6% | 12.8% | 13.8% |
| Age 35 to 44 | 15.1% | 10.9% | 12.9% |
| Age 45 to 54 | 14.2% | 12.2% | 12.6% |
| Age 55 to 59 | 4.2% | 6.9% | 6.7% |
| Age 60 to 64 | 3.6% | 7.4% | 6.3% |
| Age 65 to 74 | 5.6% | 10.7% | 9.6% |
| Age 75 to 84 | 3.6% | 4.0% | 4.5% |
| Age 85 and over | 2.1% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Trenton, OH | Middletown, OH | United States |
| White | 96.6% | 77.9% | 59.4% |
| Black | 0.7% | 11.3% | 12.2% |
| Asian | 0.0% | 0.6% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 1.3% | 5.3% | 3.2% |
| Hispanic | 1.4% | 4.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Trenton, OH | Middletown, OH | United States |
| Married Population | 52.1% | 40.5% | 49.8% |
| Currently Married | 51.1% | 36.9% | 48.0% |
| Married but Separated | 1.0% | 3.6% | 1.8% |
| Single Population | 47.9% | 59.5% | 50.2% |
| Never Married | 33.1% | 36.9% | 33.8% |
| Divorced | 10.9% | 14.3% | 10.8% |
| Widowed | 3.9% | 8.3% | 5.6% |
| space5 | | | |
| Household Size | 3.07 | 2.42 | 2.60 |
| Households | 4,226 | 20,441 | 124,010,992 |
| Family Households | 3,366 | 11,805 | 80,755,759 |
| Married couple, w/children | 37.6% | 19.6% | 30.5% |
| Married couple, no children | 37.2% | 39.8% | 42.9% |
| Non Family Households | 860 | 8,636 | 43,255,233 |
| Single householder, w/children | 19.8% | 27.1% | 15.8% |
| Single householder, no children | 5.4% | 13.4% | 10.8% |