| | Trenton, TN | Plainfield, IL | United States |
| Population | 4,277 | 44,296 | 329,725,481 |
| Female Population | 49.2% | 50.7% | 50.5% |
| Male Population | 50.9% | 49.4% | 49.5% |
| Median Age | 34.7 | 37.3 | 38.4 |
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| Population - 2010 | 4,287 | 39,990 | 309,327,143 |
| Population - 2000 | 4,683 | 13,038 | 285,036,114 |
| Population - 1990 | 4,836 | 4,557 | 251,960,433 |
| Pop. 2000 to Now | -11.5% | 241.6% | 15.6% |
| Pop. 1990 to Now | -14.3% | 877.4% | 30.8% |
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| Population Density | 532.6 | 1,808.1 | 93.4 |
| Land Area | 8.0 | 24.5 | 3,531,905.4 |
| Water Area | 0.1 | 1.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Trenton, TN | Plainfield, IL | United States |
| Age 0 to 4 | 8.4% | 5.7% | 5.9% |
| Age 5 to 9 | 6.5% | 8.2% | 6.1% |
| Age 10 to 14 | 4.5% | 10.5% | 6.6% |
| Age 15 to 17 | 2.2% | 5.8% | 3.9% |
| Age 18 to 20 | 4.4% | 3.8% | 4.0% |
| Age 21 to 24 | 4.8% | 4.3% | 5.2% |
| Age 25 to 34 | 19.4% | 8.7% | 13.8% |
| Age 35 to 44 | 7.1% | 15.6% | 12.9% |
| Age 45 to 54 | 15.8% | 17.9% | 12.6% |
| Age 55 to 59 | 5.8% | 6.0% | 6.7% |
| Age 60 to 64 | 5.0% | 4.3% | 6.3% |
| Age 65 to 74 | 7.4% | 5.6% | 9.6% |
| Age 75 to 84 | 6.3% | 2.4% | 4.5% |
| Age 85 and over | 2.4% | 1.3% | 1.9% |
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| Race | | | |
| | Trenton, TN | Plainfield, IL | United States |
| White | 55.0% | 68.6% | 59.4% |
| Black | 29.9% | 8.3% | 12.2% |
| Asian | 0.0% | 9.4% | 5.6% |
| Native American | 0.1% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 10.1% | 3.3% | 3.2% |
| Hispanic | 4.9% | 9.9% | 18.4% |
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| Marriage & Family | | | |
| | Trenton, TN | Plainfield, IL | United States |
| Married Population | 35.6% | 62.9% | 49.8% |
| Currently Married | 31.3% | 62.1% | 48.0% |
| Married but Separated | 4.3% | 0.8% | 1.8% |
| Single Population | 64.4% | 37.1% | 50.2% |
| Never Married | 40.1% | 27.5% | 33.8% |
| Divorced | 16.4% | 6.5% | 10.8% |
| Widowed | 7.9% | 3.2% | 5.6% |
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| Household Size | 2.37 | 3.27 | 2.60 |
| Households | 1,603 | 13,510 | 124,010,992 |
| Family Households | 854 | 11,525 | 80,755,759 |
| Married couple, w/children | 16.6% | 50.1% | 30.5% |
| Married couple, no children | 39.7% | 34.6% | 42.9% |
| Non Family Households | 749 | 1,985 | 43,255,233 |
| Single householder, w/children | 30.8% | 9.3% | 15.8% |
| Single householder, no children | 12.9% | 6.0% | 10.8% |