| | West Chicago, IL | Rochester Hills, MI | United States |
| Population | 25,881 | 75,990 | 329,725,481 |
| Female Population | 49.4% | 50.9% | 50.5% |
| Male Population | 50.7% | 49.1% | 49.5% |
| Median Age | 35.2 | 40.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 27,272 | 71,039 | 309,327,143 |
| Population - 2000 | 23,469 | 68,825 | 285,036,114 |
| Population - 1990 | 14,796 | 61,766 | 251,960,433 |
| Pop. 2000 to Now | 13.3% | 7.7% | 15.6% |
| Pop. 1990 to Now | 79.7% | 20.0% | 30.8% |
| space4 | | | |
| Population Density | 1,684.5 | 2,316.5 | 93.4 |
| Land Area | 15.4 | 32.8 | 3,531,905.4 |
| Water Area | 0.3 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | West Chicago, IL | Rochester Hills, MI | United States |
| Age 0 to 4 | 5.5% | 5.3% | 5.9% |
| Age 5 to 9 | 5.9% | 6.8% | 6.1% |
| Age 10 to 14 | 8.4% | 6.5% | 6.6% |
| Age 15 to 17 | 6.0% | 4.2% | 3.9% |
| Age 18 to 20 | 5.8% | 4.2% | 4.0% |
| Age 21 to 24 | 6.4% | 4.2% | 5.2% |
| Age 25 to 34 | 11.8% | 10.5% | 13.8% |
| Age 35 to 44 | 12.4% | 14.2% | 12.9% |
| Age 45 to 54 | 16.4% | 13.6% | 12.6% |
| Age 55 to 59 | 7.3% | 6.8% | 6.7% |
| Age 60 to 64 | 4.8% | 6.9% | 6.3% |
| Age 65 to 74 | 5.5% | 10.1% | 9.6% |
| Age 75 to 84 | 2.6% | 4.6% | 4.5% |
| Age 85 and over | 1.1% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | West Chicago, IL | Rochester Hills, MI | United States |
| White | 35.7% | 76.0% | 59.4% |
| Black | 3.5% | 3.2% | 12.2% |
| Asian | 8.5% | 12.8% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.3% | 0.4% |
| Two or More Races | 3.2% | 3.1% | 3.2% |
| Hispanic | 48.9% | 4.6% | 18.4% |
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| Marriage & Family | | | |
| | West Chicago, IL | Rochester Hills, MI | United States |
| Married Population | 51.9% | 59.4% | 49.8% |
| Currently Married | 50.2% | 58.8% | 48.0% |
| Married but Separated | 1.7% | 0.5% | 1.8% |
| Single Population | 48.1% | 40.6% | 50.2% |
| Never Married | 37.9% | 26.8% | 33.8% |
| Divorced | 6.3% | 9.1% | 10.8% |
| Widowed | 3.8% | 4.8% | 5.6% |
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| Household Size | 3.39 | 2.56 | 2.60 |
| Households | 7,540 | 28,941 | 124,010,992 |
| Family Households | 5,961 | 20,801 | 80,755,759 |
| Married couple, w/children | 39.6% | 38.0% | 30.5% |
| Married couple, no children | 34.3% | 47.9% | 42.9% |
| Non Family Households | 1,579 | 8,140 | 43,255,233 |
| Single householder, w/children | 14.3% | 6.8% | 15.8% |
| Single householder, no children | 11.7% | 7.3% | 10.8% |