| | Westland, MI | Tracy, CA | United States |
| Population | 84,961 | 92,792 | 329,725,481 |
| Female Population | 53.6% | 49.3% | 50.5% |
| Male Population | 46.4% | 50.7% | 49.5% |
| Median Age | 38.6 | 33.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 83,960 | 83,605 | 309,327,143 |
| Population - 2000 | 86,602 | 56,929 | 285,036,114 |
| Population - 1990 | 84,724 | 33,558 | 251,960,433 |
| Pop. 2000 to Now | -6.3% | 66.9% | 15.6% |
| Pop. 1990 to Now | -4.3% | 183.2% | 30.8% |
| space4 | | | |
| Population Density | 4,158.2 | 4,190.8 | 93.4 |
| Land Area | 20.4 | 22.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Westland, MI | Tracy, CA | United States |
| Age 0 to 4 | 7.1% | 6.7% | 5.9% |
| Age 5 to 9 | 5.9% | 7.2% | 6.1% |
| Age 10 to 14 | 5.9% | 9.4% | 6.6% |
| Age 15 to 17 | 2.9% | 4.5% | 3.9% |
| Age 18 to 20 | 2.8% | 4.7% | 4.0% |
| Age 21 to 24 | 5.1% | 4.9% | 5.2% |
| Age 25 to 34 | 15.4% | 13.7% | 13.8% |
| Age 35 to 44 | 12.2% | 14.1% | 12.9% |
| Age 45 to 54 | 12.7% | 14.4% | 12.6% |
| Age 55 to 59 | 6.8% | 5.7% | 6.7% |
| Age 60 to 64 | 6.7% | 5.0% | 6.3% |
| Age 65 to 74 | 10.0% | 6.1% | 9.6% |
| Age 75 to 84 | 4.4% | 2.3% | 4.5% |
| Age 85 and over | 2.0% | 1.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Westland, MI | Tracy, CA | United States |
| White | 63.7% | 28.0% | 59.4% |
| Black | 22.1% | 4.9% | 12.2% |
| Asian | 4.0% | 18.5% | 5.6% |
| Native American | 0.4% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 1.1% | 0.2% |
| Other | 0.1% | 0.4% | 0.4% |
| Two or More Races | 4.9% | 5.5% | 3.2% |
| Hispanic | 4.9% | 41.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Westland, MI | Tracy, CA | United States |
| Married Population | 40.6% | 53.7% | 49.8% |
| Currently Married | 39.0% | 51.5% | 48.0% |
| Married but Separated | 1.6% | 2.2% | 1.8% |
| Single Population | 59.4% | 46.3% | 50.2% |
| Never Married | 37.7% | 33.0% | 33.8% |
| Divorced | 15.1% | 9.2% | 10.8% |
| Widowed | 6.6% | 4.1% | 5.6% |
| space5 | | | |
| Household Size | 2.39 | 3.40 | 2.60 |
| Households | 35,263 | 27,237 | 124,010,992 |
| Family Households | 19,762 | 21,603 | 80,755,759 |
| Married couple, w/children | 25.4% | 42.5% | 30.5% |
| Married couple, no children | 38.6% | 32.6% | 42.9% |
| Non Family Households | 15,501 | 5,634 | 43,255,233 |
| Single householder, w/children | 20.1% | 13.7% | 15.8% |
| Single householder, no children | 15.9% | 11.2% | 10.8% |