| | Mount Zion, IL | Athens, IL | United States |
| Population | 6,092 | 2,303 | 329,725,481 |
| Female Population | 50.8% | 57.3% | 50.5% |
| Male Population | 49.2% | 42.7% | 49.5% |
| Median Age | 39.4 | 35 | 38.4 |
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| Population - 2010 | 5,857 | 1,996 | 309,327,143 |
| Population - 2000 | 4,845 | 1,726 | 285,036,114 |
| Population - 1990 | 4,522 | 1,404 | 251,960,433 |
| Pop. 2000 to Now | 18.9% | 9.7% | 15.6% |
| Pop. 1990 to Now | 27.4% | 34.8% | 30.8% |
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| Population Density | 1,476.5 | 1,369.2 | 93.4 |
| Land Area | 4.1 | 1.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Mount Zion, IL | Athens, IL | United States |
| Age 0 to 4 | 4.4% | 7.4% | 5.9% |
| Age 5 to 9 | 12.7% | 7.7% | 6.1% |
| Age 10 to 14 | 11.0% | 7.6% | 6.6% |
| Age 15 to 17 | 2.7% | 5.7% | 3.9% |
| Age 18 to 20 | 3.3% | 1.6% | 4.0% |
| Age 21 to 24 | 3.3% | 6.2% | 5.2% |
| Age 25 to 34 | 5.9% | 13.8% | 13.8% |
| Age 35 to 44 | 20.0% | 10.0% | 12.9% |
| Age 45 to 54 | 7.2% | 11.4% | 12.6% |
| Age 55 to 59 | 6.1% | 9.7% | 6.7% |
| Age 60 to 64 | 5.6% | 9.9% | 6.3% |
| Age 65 to 74 | 10.6% | 5.7% | 9.6% |
| Age 75 to 84 | 4.6% | 3.2% | 4.5% |
| Age 85 and over | 2.6% | 0.1% | 1.9% |
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| Race | | | |
| | Mount Zion, IL | Athens, IL | United States |
| White | 92.3% | 89.5% | 59.4% |
| Black | 2.7% | 4.3% | 12.2% |
| Asian | 0.2% | 0.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.5% | 0.4% |
| Two or More Races | 3.2% | 3.1% | 3.2% |
| Hispanic | 1.2% | 1.9% | 18.4% |
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| Marriage & Family | | | |
| | Mount Zion, IL | Athens, IL | United States |
| Married Population | 69.5% | 60.1% | 49.8% |
| Currently Married | 68.9% | 57.8% | 48.0% |
| Married but Separated | 0.5% | 2.2% | 1.8% |
| Single Population | 30.5% | 39.9% | 50.2% |
| Never Married | 17.4% | 22.7% | 33.8% |
| Divorced | 7.8% | 12.2% | 10.8% |
| Widowed | 5.3% | 5.1% | 5.6% |
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| Household Size | 2.86 | 2.55 | 2.60 |
| Households | 2,107 | 904 | 124,010,992 |
| Family Households | 1,626 | 670 | 80,755,759 |
| Married couple, w/children | 36.8% | 29.7% | 30.5% |
| Married couple, no children | 53.2% | 43.1% | 42.9% |
| Non Family Households | 481 | 234 | 43,255,233 |
| Single householder, w/children | 6.6% | 20.3% | 15.8% |
| Single householder, no children | 3.4% | 6.9% | 10.8% |