| | Trenton, MO | Moberly, MO | United States |
| Population | 5,547 | 13,933 | 329,725,481 |
| Female Population | 51.8% | 45.3% | 50.5% |
| Male Population | 48.2% | 54.7% | 49.5% |
| Median Age | 40.3 | 37.6 | 38.4 |
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| Population - 2010 | 5,996 | 14,063 | 309,327,143 |
| Population - 2000 | 6,216 | 11,945 | 285,036,114 |
| Population - 1990 | 6,129 | 12,839 | 251,960,433 |
| Pop. 2000 to Now | -9.6% | 13.1% | 15.6% |
| Pop. 1990 to Now | -8.3% | 5.2% | 30.8% |
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| Population Density | 860.4 | 1,083.7 | 93.4 |
| Land Area | 6.4 | 12.9 | 3,531,905.4 |
| Water Area | 0.3 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Trenton, MO | Moberly, MO | United States |
| Age 0 to 4 | 6.3% | 6.3% | 5.9% |
| Age 5 to 9 | 7.6% | 7.9% | 6.1% |
| Age 10 to 14 | 6.0% | 4.7% | 6.6% |
| Age 15 to 17 | 3.5% | 3.5% | 3.9% |
| Age 18 to 20 | 5.1% | 3.0% | 4.0% |
| Age 21 to 24 | 4.6% | 6.0% | 5.2% |
| Age 25 to 34 | 13.7% | 15.0% | 13.8% |
| Age 35 to 44 | 8.5% | 14.6% | 12.9% |
| Age 45 to 54 | 8.7% | 10.3% | 12.6% |
| Age 55 to 59 | 5.6% | 7.4% | 6.7% |
| Age 60 to 64 | 7.8% | 6.9% | 6.3% |
| Age 65 to 74 | 10.1% | 7.5% | 9.6% |
| Age 75 to 84 | 8.1% | 4.7% | 4.5% |
| Age 85 and over | 4.5% | 2.1% | 1.9% |
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| Race | | | |
| | Trenton, MO | Moberly, MO | United States |
| White | 90.9% | 82.0% | 59.4% |
| Black | 0.6% | 10.3% | 12.2% |
| Asian | 2.0% | 0.7% | 5.6% |
| Native American | 0.2% | 0.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.7% | 0.4% |
| Two or More Races | 2.1% | 3.7% | 3.2% |
| Hispanic | 3.5% | 2.1% | 18.4% |
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| Marriage & Family | | | |
| | Trenton, MO | Moberly, MO | United States |
| Married Population | 45.5% | 36.6% | 49.8% |
| Currently Married | 42.9% | 34.7% | 48.0% |
| Married but Separated | 2.6% | 1.9% | 1.8% |
| Single Population | 54.5% | 63.4% | 50.2% |
| Never Married | 27.9% | 35.7% | 33.8% |
| Divorced | 14.9% | 18.9% | 10.8% |
| Widowed | 11.8% | 8.8% | 5.6% |
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| Household Size | 2.51 | 2.50 | 2.60 |
| Households | 2,076 | 4,815 | 124,010,992 |
| Family Households | 1,159 | 3,050 | 80,755,759 |
| Married couple, w/children | 28.2% | 23.8% | 30.5% |
| Married couple, no children | 49.4% | 31.1% | 42.9% |
| Non Family Households | 917 | 1,765 | 43,255,233 |
| Single householder, w/children | 14.2% | 28.6% | 15.8% |
| Single householder, no children | 8.2% | 16.5% | 10.8% |