| | Palos Hills, IL | Palos Heights, IL | United States |
| Population | 18,379 | 12,116 | 329,725,481 |
| Female Population | 51.8% | 50.4% | 50.5% |
| Male Population | 48.2% | 49.6% | 49.5% |
| Median Age | 46.7 | 51.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 17,496 | 12,520 | 309,327,143 |
| Population - 2000 | 17,665 | 11,260 | 285,036,114 |
| Population - 1990 | 17,803 | 11,478 | 251,960,433 |
| Pop. 2000 to Now | -4.5% | 9.9% | 15.6% |
| Pop. 1990 to Now | -5.2% | 7.8% | 30.8% |
| space4 | | | |
| Population Density | 4,328.5 | 3,208.7 | 93.4 |
| Land Area | 4.2 | 3.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Palos Hills, IL | Palos Heights, IL | United States |
| Age 0 to 4 | 4.2% | 4.5% | 5.9% |
| Age 5 to 9 | 5.4% | 4.0% | 6.1% |
| Age 10 to 14 | 5.7% | 6.2% | 6.6% |
| Age 15 to 17 | 3.3% | 3.4% | 3.9% |
| Age 18 to 20 | 4.1% | 4.0% | 4.0% |
| Age 21 to 24 | 3.0% | 3.2% | 5.2% |
| Age 25 to 34 | 8.8% | 10.7% | 13.8% |
| Age 35 to 44 | 13.6% | 9.1% | 12.9% |
| Age 45 to 54 | 13.8% | 8.6% | 12.6% |
| Age 55 to 59 | 6.2% | 8.5% | 6.7% |
| Age 60 to 64 | 8.6% | 7.9% | 6.3% |
| Age 65 to 74 | 13.4% | 16.7% | 9.6% |
| Age 75 to 84 | 7.2% | 8.8% | 4.5% |
| Age 85 and over | 2.8% | 4.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Palos Hills, IL | Palos Heights, IL | United States |
| White | 80.1% | 87.0% | 59.4% |
| Black | 5.9% | 2.4% | 12.2% |
| Asian | 2.5% | 1.3% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 2.0% | 0.8% | 3.2% |
| Hispanic | 9.5% | 8.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Palos Hills, IL | Palos Heights, IL | United States |
| Married Population | 47.7% | 57.0% | 49.8% |
| Currently Married | 46.6% | 56.8% | 48.0% |
| Married but Separated | 1.1% | 0.2% | 1.8% |
| Single Population | 52.3% | 43.0% | 50.2% |
| Never Married | 30.7% | 27.2% | 33.8% |
| Divorced | 12.1% | 7.6% | 10.8% |
| Widowed | 9.5% | 8.2% | 5.6% |
| space5 | | | |
| Household Size | 2.35 | 2.56 | 2.60 |
| Households | 7,727 | 4,467 | 124,010,992 |
| Family Households | 4,582 | 3,275 | 80,755,759 |
| Married couple, w/children | 27.7% | 24.7% | 30.5% |
| Married couple, no children | 47.1% | 59.3% | 42.9% |
| Non Family Households | 3,145 | 1,192 | 43,255,233 |
| Single householder, w/children | 11.2% | 4.6% | 15.8% |
| Single householder, no children | 14.1% | 11.5% | 10.8% |