| | Bement, IL | Nashville, IL | United States |
| Population | 1,548 | 3,108 | 329,725,481 |
| Female Population | 52.1% | 53.7% | 50.5% |
| Male Population | 47.9% | 46.3% | 49.5% |
| Median Age | 44 | 43.6 | 38.4 |
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| Population - 2010 | 1,726 | 3,257 | 309,327,143 |
| Population - 2000 | 1,784 | 3,147 | 285,036,114 |
| Population - 1990 | 1,668 | 3,202 | 251,960,433 |
| Pop. 2000 to Now | -6.9% | -5.2% | 15.6% |
| Pop. 1990 to Now | -0.4% | -6.8% | 30.8% |
| space4 | | | |
| Population Density | 2,028.8 | 1,174.6 | 93.4 |
| Land Area | 0.8 | 2.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Bement, IL | Nashville, IL | United States |
| Age 0 to 4 | 5.0% | 4.7% | 5.9% |
| Age 5 to 9 | 5.3% | 6.9% | 6.1% |
| Age 10 to 14 | 2.6% | 5.0% | 6.6% |
| Age 15 to 17 | 6.5% | 2.8% | 3.9% |
| Age 18 to 20 | 3.7% | 3.1% | 4.0% |
| Age 21 to 24 | 3.8% | 4.0% | 5.2% |
| Age 25 to 34 | 10.5% | 14.5% | 13.8% |
| Age 35 to 44 | 14.1% | 12.0% | 12.9% |
| Age 45 to 54 | 16.4% | 11.5% | 12.6% |
| Age 55 to 59 | 7.3% | 5.5% | 6.7% |
| Age 60 to 64 | 8.5% | 7.4% | 6.3% |
| Age 65 to 74 | 11.7% | 9.6% | 9.6% |
| Age 75 to 84 | 3.6% | 10.1% | 4.5% |
| Age 85 and over | 1.1% | 2.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Bement, IL | Nashville, IL | United States |
| White | 96.0% | 98.9% | 59.4% |
| Black | 1.8% | 0.8% | 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 | 0.8% | 0.0% | 3.2% |
| Hispanic | 1.4% | 0.1% | 18.4% |
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| Marriage & Family | | | |
| | Bement, IL | Nashville, IL | United States |
| Married Population | 45.9% | 46.8% | 49.8% |
| Currently Married | 45.7% | 44.9% | 48.0% |
| Married but Separated | 0.2% | 1.9% | 1.8% |
| Single Population | 54.1% | 53.2% | 50.2% |
| Never Married | 30.5% | 26.6% | 33.8% |
| Divorced | 17.4% | 17.3% | 10.8% |
| Widowed | 6.2% | 9.3% | 5.6% |
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| Household Size | 2.41 | 2.24 | 2.60 |
| Households | 626 | 1,320 | 124,010,992 |
| Family Households | 386 | 816 | 80,755,759 |
| Married couple, w/children | 31.6% | 29.4% | 30.5% |
| Married couple, no children | 42.5% | 37.9% | 42.9% |
| Non Family Households | 240 | 504 | 43,255,233 |
| Single householder, w/children | 19.9% | 24.5% | 15.8% |
| Single householder, no children | 6.0% | 8.2% | 10.8% |