| | Union City, MI | Battle Creek, MI | United States |
| Population | 1,699 | 52,434 | 329,725,481 |
| Female Population | 54.5% | 51.2% | 50.5% |
| Male Population | 45.5% | 48.8% | 49.5% |
| Median Age | 30.5 | 37 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,590 | 52,303 | 309,327,143 |
| Population - 2000 | 1,804 | 53,364 | 285,036,114 |
| Population - 1990 | 1,767 | 53,540 | 251,960,433 |
| Pop. 2000 to Now | -13.3% | -4.8% | 15.6% |
| Pop. 1990 to Now | -11.5% | -5.1% | 30.8% |
| space4 | | | |
| Population Density | 1,175.8 | 1,230.7 | 93.4 |
| Land Area | 1.4 | 42.6 | 3,531,905.4 |
| Water Area | 0.0 | 1.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Union City, MI | Battle Creek, MI | United States |
| Age 0 to 4 | 8.2% | 7.0% | 5.9% |
| Age 5 to 9 | 5.6% | 7.0% | 6.1% |
| Age 10 to 14 | 5.5% | 7.0% | 6.6% |
| Age 15 to 17 | 9.8% | 4.7% | 3.9% |
| Age 18 to 20 | 8.1% | 3.5% | 4.0% |
| Age 21 to 24 | 7.1% | 4.4% | 5.2% |
| Age 25 to 34 | 9.7% | 13.6% | 13.8% |
| Age 35 to 44 | 11.0% | 13.8% | 12.9% |
| Age 45 to 54 | 14.5% | 11.9% | 12.6% |
| Age 55 to 59 | 4.4% | 5.8% | 6.7% |
| Age 60 to 64 | 4.4% | 5.9% | 6.3% |
| Age 65 to 74 | 4.5% | 9.4% | 9.6% |
| Age 75 to 84 | 5.6% | 4.1% | 4.5% |
| Age 85 and over | 1.7% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Union City, MI | Battle Creek, MI | United States |
| White | 80.9% | 64.0% | 59.4% |
| Black | 0.0% | 15.8% | 12.2% |
| Asian | 0.2% | 4.7% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.5% | 0.4% |
| Two or More Races | 17.0% | 6.3% | 3.2% |
| Hispanic | 1.8% | 8.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Union City, MI | Battle Creek, MI | United States |
| Married Population | 35.5% | 40.4% | 49.8% |
| Currently Married | 33.3% | 38.9% | 48.0% |
| Married but Separated | 2.3% | 1.5% | 1.8% |
| Single Population | 64.5% | 59.6% | 50.2% |
| Never Married | 39.7% | 37.2% | 33.8% |
| Divorced | 17.9% | 16.8% | 10.8% |
| Widowed | 6.9% | 5.6% | 5.6% |
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| Household Size | 2.65 | 2.43 | 2.60 |
| Households | 640 | 21,051 | 124,010,992 |
| Family Households | 406 | 12,121 | 80,755,759 |
| Married couple, w/children | 17.5% | 25.2% | 30.5% |
| Married couple, no children | 37.4% | 36.6% | 42.9% |
| Non Family Households | 234 | 8,930 | 43,255,233 |
| Single householder, w/children | 35.5% | 25.4% | 15.8% |
| Single householder, no children | 9.6% | 12.8% | 10.8% |