| | Sauk Village, IL | South Chicago Heights, IL | United States |
| Population | 9,981 | 4,022 | 329,725,481 |
| Female Population | 53.4% | 57.0% | 50.5% |
| Male Population | 46.6% | 43.0% | 49.5% |
| Median Age | 30.9 | 33.9 | 38.4 |
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| Population - 2010 | 10,561 | 4,145 | 309,327,143 |
| Population - 2000 | 10,411 | 3,970 | 285,036,114 |
| Population - 1990 | 9,926 | 3,597 | 251,960,433 |
| Pop. 2000 to Now | -2.8% | -0.3% | 15.6% |
| Pop. 1990 to Now | 2.0% | 10.0% | 30.8% |
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| Population Density | 2,558.6 | 2,544.0 | 93.4 |
| Land Area | 3.9 | 1.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Sauk Village, IL | South Chicago Heights, IL | United States |
| Age 0 to 4 | 7.9% | 12.4% | 5.9% |
| Age 5 to 9 | 6.4% | 6.9% | 6.1% |
| Age 10 to 14 | 10.1% | 11.5% | 6.6% |
| Age 15 to 17 | 3.4% | 3.7% | 3.9% |
| Age 18 to 20 | 7.8% | 3.6% | 4.0% |
| Age 21 to 24 | 5.8% | 3.3% | 5.2% |
| Age 25 to 34 | 16.2% | 10.5% | 13.8% |
| Age 35 to 44 | 12.2% | 6.4% | 12.9% |
| Age 45 to 54 | 11.1% | 13.0% | 12.6% |
| Age 55 to 59 | 3.9% | 5.5% | 6.7% |
| Age 60 to 64 | 5.6% | 8.2% | 6.3% |
| Age 65 to 74 | 6.5% | 9.6% | 9.6% |
| Age 75 to 84 | 2.4% | 4.2% | 4.5% |
| Age 85 and over | 0.9% | 1.1% | 1.9% |
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| Race | | | |
| | Sauk Village, IL | South Chicago Heights, IL | United States |
| White | 19.7% | 29.4% | 59.4% |
| Black | 64.5% | 32.8% | 12.2% |
| Asian | 0.6% | 0.0% | 5.6% |
| Native American | 0.1% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.8% | 2.6% | 3.2% |
| Hispanic | 11.1% | 34.9% | 18.4% |
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| Marriage & Family | | | |
| | Sauk Village, IL | South Chicago Heights, IL | United States |
| Married Population | 25.7% | 44.1% | 49.8% |
| Currently Married | 24.1% | 41.8% | 48.0% |
| Married but Separated | 1.5% | 2.2% | 1.8% |
| Single Population | 74.3% | 55.9% | 50.2% |
| Never Married | 54.2% | 38.5% | 33.8% |
| Divorced | 12.9% | 11.5% | 10.8% |
| Widowed | 7.2% | 6.0% | 5.6% |
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| Household Size | 3.14 | 2.53 | 2.60 |
| Households | 3,161 | 1,556 | 124,010,992 |
| Family Households | 2,159 | 1,002 | 80,755,759 |
| Married couple, w/children | 10.6% | 22.2% | 30.5% |
| Married couple, no children | 23.9% | 27.8% | 42.9% |
| Non Family Households | 1,002 | 554 | 43,255,233 |
| Single householder, w/children | 43.2% | 39.0% | 15.8% |
| Single householder, no children | 22.4% | 11.0% | 10.8% |