| | Manhattan, IL | Chicago Ridge, IL | United States |
| Population | 9,366 | 14,413 | 329,725,481 |
| Female Population | 47.6% | 51.3% | 50.5% |
| Male Population | 52.4% | 48.7% | 49.5% |
| Median Age | 33.9 | 35.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 7,090 | 14,318 | 309,327,143 |
| Population - 2000 | 3,330 | 14,127 | 285,036,114 |
| Population - 1990 | 2,059 | 13,643 | 251,960,433 |
| Pop. 2000 to Now | 164.2% | -2.5% | 15.6% |
| Pop. 1990 to Now | 327.3% | 1.0% | 30.8% |
| space4 | | | |
| Population Density | 1,421.5 | 6,354.9 | 93.4 |
| Land Area | 6.6 | 2.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Manhattan, IL | Chicago Ridge, IL | United States |
| Age 0 to 4 | 9.0% | 8.2% | 5.9% |
| Age 5 to 9 | 8.1% | 6.9% | 6.1% |
| Age 10 to 14 | 8.6% | 5.0% | 6.6% |
| Age 15 to 17 | 5.2% | 3.0% | 3.9% |
| Age 18 to 20 | 2.5% | 1.6% | 4.0% |
| Age 21 to 24 | 4.3% | 5.7% | 5.2% |
| Age 25 to 34 | 13.4% | 18.0% | 13.8% |
| Age 35 to 44 | 16.0% | 10.6% | 12.9% |
| Age 45 to 54 | 12.0% | 10.0% | 12.6% |
| Age 55 to 59 | 6.3% | 8.6% | 6.7% |
| Age 60 to 64 | 4.7% | 6.5% | 6.3% |
| Age 65 to 74 | 7.5% | 9.6% | 9.6% |
| Age 75 to 84 | 2.3% | 4.4% | 4.5% |
| Age 85 and over | 0.2% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Manhattan, IL | Chicago Ridge, IL | United States |
| White | 89.9% | 65.9% | 59.4% |
| Black | 1.0% | 7.9% | 12.2% |
| Asian | 0.1% | 2.6% | 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 | 5.3% | 10.1% | 3.2% |
| Hispanic | 3.7% | 13.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Manhattan, IL | Chicago Ridge, IL | United States |
| Married Population | 63.6% | 48.6% | 49.8% |
| Currently Married | 63.4% | 46.6% | 48.0% |
| Married but Separated | 0.2% | 1.9% | 1.8% |
| Single Population | 36.4% | 51.4% | 50.2% |
| Never Married | 24.8% | 35.1% | 33.8% |
| Divorced | 9.6% | 10.1% | 10.8% |
| Widowed | 2.0% | 6.3% | 5.6% |
| space5 | | | |
| Household Size | 3.04 | 2.58 | 2.60 |
| Households | 3,076 | 5,415 | 124,010,992 |
| Family Households | 2,432 | 3,314 | 80,755,759 |
| Married couple, w/children | 52.1% | 36.1% | 30.5% |
| Married couple, no children | 35.3% | 38.1% | 42.9% |
| Non Family Households | 644 | 2,101 | 43,255,233 |
| Single householder, w/children | 9.9% | 8.2% | 15.8% |
| Single householder, no children | 2.7% | 17.6% | 10.8% |