| | Richton Park, IL | Monee, IL | United States |
| Population | 12,867 | 5,131 | 329,725,481 |
| Female Population | 52.7% | 43.9% | 50.5% |
| Male Population | 47.4% | 56.1% | 49.5% |
| Median Age | 41.9 | 38.8 | 38.4 |
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| Population - 2010 | 13,682 | 5,129 | 309,327,143 |
| Population - 2000 | 12,533 | 2,924 | 285,036,114 |
| Population - 1990 | 10,523 | 1,044 | 251,960,433 |
| Pop. 2000 to Now | 4.8% | 72.0% | 15.6% |
| Pop. 1990 to Now | 24.9% | 381.7% | 30.8% |
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| Population Density | 3,200.0 | 1,129.9 | 93.4 |
| Land Area | 4.0 | 4.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Richton Park, IL | Monee, IL | United States |
| Age 0 to 4 | 4.7% | 8.4% | 5.9% |
| Age 5 to 9 | 4.9% | 2.3% | 6.1% |
| Age 10 to 14 | 6.2% | 2.3% | 6.6% |
| Age 15 to 17 | 4.0% | 1.9% | 3.9% |
| Age 18 to 20 | 6.7% | 2.7% | 4.0% |
| Age 21 to 24 | 7.4% | 0.0% | 5.2% |
| Age 25 to 34 | 9.3% | 22.3% | 13.8% |
| Age 35 to 44 | 10.8% | 16.1% | 12.9% |
| Age 45 to 54 | 18.1% | 13.0% | 12.6% |
| Age 55 to 59 | 8.6% | 7.8% | 6.7% |
| Age 60 to 64 | 5.2% | 7.2% | 6.3% |
| Age 65 to 74 | 7.5% | 8.6% | 9.6% |
| Age 75 to 84 | 4.9% | 4.4% | 4.5% |
| Age 85 and over | 1.7% | 3.0% | 1.9% |
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| Race | | | |
| | Richton Park, IL | Monee, IL | United States |
| White | 7.6% | 56.1% | 59.4% |
| Black | 87.1% | 32.6% | 12.2% |
| Asian | 0.4% | 2.3% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.7% | 0.0% | 0.4% |
| Two or More Races | 2.0% | 0.4% | 3.2% |
| Hispanic | 2.1% | 8.4% | 18.4% |
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| Marriage & Family | | | |
| | Richton Park, IL | Monee, IL | United States |
| Married Population | 38.8% | 43.4% | 49.8% |
| Currently Married | 35.8% | 43.4% | 48.0% |
| Married but Separated | 3.0% | 0.0% | 1.8% |
| Single Population | 61.2% | 56.6% | 50.2% |
| Never Married | 43.4% | 32.6% | 33.8% |
| Divorced | 9.7% | 14.5% | 10.8% |
| Widowed | 8.1% | 9.4% | 5.6% |
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| Household Size | 2.55 | 2.24 | 2.60 |
| Households | 4,991 | 2,282 | 124,010,992 |
| Family Households | 3,167 | 1,219 | 80,755,759 |
| Married couple, w/children | 16.2% | 17.6% | 30.5% |
| Married couple, no children | 42.2% | 56.0% | 42.9% |
| Non Family Households | 1,824 | 1,063 | 43,255,233 |
| Single householder, w/children | 24.1% | 10.0% | 15.8% |
| Single householder, no children | 17.5% | 16.3% | 10.8% |