| | Orland Hills, IL | Oak Lawn, IL | United States |
| Population | 6,914 | 58,032 | 329,725,481 |
| Female Population | 47.4% | 50.9% | 50.5% |
| Male Population | 52.6% | 49.1% | 49.5% |
| Median Age | 36.2 | 41.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 7,218 | 56,732 | 309,327,143 |
| Population - 2000 | 6,779 | 55,245 | 285,036,114 |
| Population - 1990 | 5,510 | 56,182 | 251,960,433 |
| Pop. 2000 to Now | 2.4% | -1.6% | 15.6% |
| Pop. 1990 to Now | 26.0% | -3.2% | 30.8% |
| space4 | | | |
| Population Density | 6,038.4 | 6,770.7 | 93.4 |
| Land Area | 1.1 | 8.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Orland Hills, IL | Oak Lawn, IL | United States |
| Age 0 to 4 | 6.5% | 6.4% | 5.9% |
| Age 5 to 9 | 4.4% | 6.0% | 6.1% |
| Age 10 to 14 | 7.4% | 6.3% | 6.6% |
| Age 15 to 17 | 3.5% | 3.3% | 3.9% |
| Age 18 to 20 | 3.1% | 3.0% | 4.0% |
| Age 21 to 24 | 5.7% | 4.0% | 5.2% |
| Age 25 to 34 | 17.9% | 12.5% | 13.8% |
| Age 35 to 44 | 11.1% | 12.4% | 12.9% |
| Age 45 to 54 | 13.9% | 12.9% | 12.6% |
| Age 55 to 59 | 11.5% | 7.1% | 6.7% |
| Age 60 to 64 | 7.0% | 7.9% | 6.3% |
| Age 65 to 74 | 6.0% | 11.2% | 9.6% |
| Age 75 to 84 | 1.0% | 5.1% | 4.5% |
| Age 85 and over | 1.0% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Orland Hills, IL | Oak Lawn, IL | United States |
| White | 75.4% | 65.2% | 59.4% |
| Black | 6.4% | 7.4% | 12.2% |
| Asian | 3.9% | 3.0% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.5% | 0.4% |
| Two or More Races | 1.0% | 2.0% | 3.2% |
| Hispanic | 13.2% | 21.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Orland Hills, IL | Oak Lawn, IL | United States |
| Married Population | 56.0% | 51.0% | 49.8% |
| Currently Married | 53.8% | 49.9% | 48.0% |
| Married but Separated | 2.2% | 1.1% | 1.8% |
| Single Population | 44.0% | 49.0% | 50.2% |
| Never Married | 32.5% | 32.1% | 33.8% |
| Divorced | 8.2% | 8.9% | 10.8% |
| Widowed | 3.3% | 8.0% | 5.6% |
| space5 | | | |
| Household Size | 2.98 | 2.61 | 2.60 |
| Households | 2,319 | 22,064 | 124,010,992 |
| Family Households | 1,763 | 14,296 | 80,755,759 |
| Married couple, w/children | 35.0% | 33.1% | 30.5% |
| Married couple, no children | 48.3% | 42.7% | 42.9% |
| Non Family Households | 556 | 7,768 | 43,255,233 |
| Single householder, w/children | 7.1% | 10.5% | 15.8% |
| Single householder, no children | 9.6% | 13.7% | 10.8% |