| | Vienna, IL | Thebes, IL | United States |
| Population | 1,729 | 431 | 329,725,481 |
| Female Population | 54.4% | 65.2% | 50.5% |
| Male Population | 45.6% | 34.8% | 49.5% |
| Median Age | 49.2 | 25.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,429 | 432 | 309,327,143 |
| Population - 2000 | 1,234 | 478 | 285,036,114 |
| Population - 1990 | 1,446 | 461 | 251,960,433 |
| Pop. 2000 to Now | 15.6% | -36.6% | 15.6% |
| Pop. 1990 to Now | -1.3% | -34.3% | 30.8% |
| space4 | | | |
| Population Density | 609.5 | 247.0 | 93.4 |
| Land Area | 2.8 | 1.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.6 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Vienna, IL | Thebes, IL | United States |
| Age 0 to 4 | 7.9% | 19.7% | 5.9% |
| Age 5 to 9 | 8.0% | 7.9% | 6.1% |
| Age 10 to 14 | 4.8% | 9.0% | 6.6% |
| Age 15 to 17 | 2.0% | 4.2% | 3.9% |
| Age 18 to 20 | 3.1% | 4.6% | 4.0% |
| Age 21 to 24 | 2.1% | 1.9% | 5.2% |
| Age 25 to 34 | 10.2% | 16.9% | 13.8% |
| Age 35 to 44 | 9.7% | 5.6% | 12.9% |
| Age 45 to 54 | 9.8% | 6.0% | 12.6% |
| Age 55 to 59 | 6.3% | 5.8% | 6.7% |
| Age 60 to 64 | 7.5% | 12.5% | 6.3% |
| Age 65 to 74 | 14.6% | 2.6% | 9.6% |
| Age 75 to 84 | 5.6% | 1.9% | 4.5% |
| Age 85 and over | 8.4% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Vienna, IL | Thebes, IL | United States |
| White | 94.9% | 79.8% | 59.4% |
| Black | 0.6% | 18.6% | 12.2% |
| Asian | 0.3% | 0.0% | 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 | 2.9% | 1.6% | 3.2% |
| Hispanic | 1.3% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Vienna, IL | Thebes, IL | United States |
| Married Population | 32.2% | 56.4% | 49.8% |
| Currently Married | 31.7% | 39.9% | 48.0% |
| Married but Separated | 0.5% | 16.5% | 1.8% |
| Single Population | 67.8% | 43.6% | 50.2% |
| Never Married | 30.4% | 34.1% | 33.8% |
| Divorced | 20.6% | 5.1% | 10.8% |
| Widowed | 16.7% | 4.4% | 5.6% |
| space5 | | | |
| Household Size | 2.84 | 4.90 | 2.60 |
| Households | 589 | 88 | 124,010,992 |
| Family Households | 323 | 60 | 80,755,759 |
| Married couple, w/children | 18.0% | 30.0% | 30.5% |
| Married couple, no children | 45.5% | 46.7% | 42.9% |
| Non Family Households | 266 | 28 | 43,255,233 |
| Single householder, w/children | 20.1% | 16.7% | 15.8% |
| Single householder, no children | 16.4% | 6.7% | 10.8% |