| | Flora, IL | Dupo, IL | United States |
| Population | 4,798 | 4,001 | 329,725,481 |
| Female Population | 53.9% | 54.5% | 50.5% |
| Male Population | 46.1% | 45.5% | 49.5% |
| Median Age | 46.7 | 40.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,069 | 4,177 | 309,327,143 |
| Population - 2000 | 5,086 | 3,933 | 285,036,114 |
| Population - 1990 | 5,054 | 3,164 | 251,960,433 |
| Pop. 2000 to Now | -5.0% | -2.2% | 15.6% |
| Pop. 1990 to Now | -4.4% | 21.5% | 30.8% |
| space4 | | | |
| Population Density | 1,023.0 | 634.9 | 93.4 |
| Land Area | 4.7 | 6.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Flora, IL | Dupo, IL | United States |
| Age 0 to 4 | 1.5% | 6.9% | 5.9% |
| Age 5 to 9 | 5.6% | 7.6% | 6.1% |
| Age 10 to 14 | 6.1% | 3.0% | 6.6% |
| Age 15 to 17 | 4.2% | 2.4% | 3.9% |
| Age 18 to 20 | 4.8% | 2.9% | 4.0% |
| Age 21 to 24 | 5.3% | 5.3% | 5.2% |
| Age 25 to 34 | 10.7% | 12.4% | 13.8% |
| Age 35 to 44 | 11.0% | 14.6% | 12.9% |
| Age 45 to 54 | 11.8% | 14.2% | 12.6% |
| Age 55 to 59 | 7.6% | 8.1% | 6.7% |
| Age 60 to 64 | 10.1% | 7.4% | 6.3% |
| Age 65 to 74 | 9.6% | 9.1% | 9.6% |
| Age 75 to 84 | 6.3% | 4.6% | 4.5% |
| Age 85 and over | 5.6% | 1.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Flora, IL | Dupo, IL | United States |
| White | 93.7% | 93.7% | 59.4% |
| Black | 0.4% | 4.5% | 12.2% |
| Asian | 0.3% | 0.0% | 5.6% |
| Native American | 1.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 4.2% | 1.4% | 3.2% |
| Hispanic | 0.1% | 0.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Flora, IL | Dupo, IL | United States |
| Married Population | 39.1% | 37.4% | 49.8% |
| Currently Married | 37.7% | 33.3% | 48.0% |
| Married but Separated | 1.3% | 4.1% | 1.8% |
| Single Population | 60.9% | 62.6% | 50.2% |
| Never Married | 27.0% | 33.6% | 33.8% |
| Divorced | 22.4% | 19.7% | 10.8% |
| Widowed | 11.6% | 9.3% | 5.6% |
| space5 | | | |
| Household Size | 2.15 | 2.33 | 2.60 |
| Households | 2,143 | 1,720 | 124,010,992 |
| Family Households | 1,119 | 923 | 80,755,759 |
| Married couple, w/children | 14.9% | 21.7% | 30.5% |
| Married couple, no children | 55.0% | 36.6% | 42.9% |
| Non Family Households | 1,024 | 797 | 43,255,233 |
| Single householder, w/children | 21.2% | 30.3% | 15.8% |
| Single householder, no children | 8.8% | 11.4% | 10.8% |