| | Greenville, MS | Darien, WI | United States |
| Population | 30,175 | 1,482 | 329,725,481 |
| Female Population | 54.2% | 50.4% | 50.5% |
| Male Population | 45.8% | 49.6% | 49.5% |
| Median Age | 38.8 | 38.6 | 38.4 |
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| Population - 2010 | 34,358 | 1,582 | 309,327,143 |
| Population - 2000 | 41,633 | 1,572 | 285,036,114 |
| Population - 1990 | 45,226 | 1,158 | 251,960,433 |
| Pop. 2000 to Now | -32.0% | 1.2% | 15.6% |
| Pop. 1990 to Now | -37.4% | 37.4% | 30.8% |
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| Population Density | 1,122.0 | 1,149.7 | 93.4 |
| Land Area | 26.9 | 1.3 | 3,531,905.4 |
| Water Area | 0.8 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Greenville, MS | Darien, WI | United States |
| Age 0 to 4 | 6.5% | 5.3% | 5.9% |
| Age 5 to 9 | 6.5% | 10.5% | 6.1% |
| Age 10 to 14 | 7.8% | 5.5% | 6.6% |
| Age 15 to 17 | 4.1% | 3.5% | 3.9% |
| Age 18 to 20 | 2.7% | 3.2% | 4.0% |
| Age 21 to 24 | 4.7% | 1.6% | 5.2% |
| Age 25 to 34 | 12.9% | 15.6% | 13.8% |
| Age 35 to 44 | 10.9% | 14.7% | 12.9% |
| Age 45 to 54 | 12.3% | 12.3% | 12.6% |
| Age 55 to 59 | 7.2% | 9.8% | 6.7% |
| Age 60 to 64 | 7.1% | 7.2% | 6.3% |
| Age 65 to 74 | 11.0% | 6.7% | 9.6% |
| Age 75 to 84 | 4.5% | 2.6% | 4.5% |
| Age 85 and over | 1.8% | 1.6% | 1.9% |
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| Race | | | |
| | Greenville, MS | Darien, WI | United States |
| White | 15.5% | 84.0% | 59.4% |
| Black | 82.4% | 0.0% | 12.2% |
| Asian | 1.2% | 0.3% | 5.6% |
| Native American | 0.1% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 0.5% | 0.0% | 3.2% |
| Hispanic | 0.2% | 15.5% | 18.4% |
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| Marriage & Family | | | |
| | Greenville, MS | Darien, WI | United States |
| Married Population | 35.4% | 55.7% | 49.8% |
| Currently Married | 32.2% | 54.2% | 48.0% |
| Married but Separated | 3.3% | 1.5% | 1.8% |
| Single Population | 64.6% | 44.3% | 50.2% |
| Never Married | 42.8% | 25.6% | 33.8% |
| Divorced | 13.7% | 14.6% | 10.8% |
| Widowed | 8.1% | 4.1% | 5.6% |
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| Household Size | 2.53 | 2.49 | 2.60 |
| Households | 11,746 | 595 | 124,010,992 |
| Family Households | 6,876 | 404 | 80,755,759 |
| Married couple, w/children | 14.6% | 28.0% | 30.5% |
| Married couple, no children | 35.9% | 51.2% | 42.9% |
| Non Family Households | 4,870 | 191 | 43,255,233 |
| Single householder, w/children | 28.4% | 12.9% | 15.8% |
| Single householder, no children | 21.1% | 7.9% | 10.8% |