| | Watervliet, MI | Hillsdale, MI | United States |
| Population | 1,901 | 8,196 | 329,725,481 |
| Female Population | 57.5% | 50.8% | 50.5% |
| Male Population | 42.5% | 49.2% | 49.5% |
| Median Age | 29.6 | 29.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,714 | 8,281 | 309,327,143 |
| Population - 2000 | 1,843 | 8,233 | 285,036,114 |
| Population - 1990 | 1,867 | 8,170 | 251,960,433 |
| Pop. 2000 to Now | -11.3% | -1.6% | 15.6% |
| Pop. 1990 to Now | -12.4% | -0.9% | 30.8% |
| space4 | | | |
| Population Density | 1,611.0 | 1,439.4 | 93.4 |
| Land Area | 1.2 | 5.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Watervliet, MI | Hillsdale, MI | United States |
| Age 0 to 4 | 10.3% | 4.6% | 5.9% |
| Age 5 to 9 | 14.5% | 6.1% | 6.1% |
| Age 10 to 14 | 4.5% | 5.8% | 6.6% |
| Age 15 to 17 | 3.7% | 3.5% | 3.9% |
| Age 18 to 20 | 4.8% | 12.8% | 4.0% |
| Age 21 to 24 | 1.8% | 12.1% | 5.2% |
| Age 25 to 34 | 16.0% | 9.2% | 13.8% |
| Age 35 to 44 | 13.2% | 13.2% | 12.9% |
| Age 45 to 54 | 9.2% | 8.2% | 12.6% |
| Age 55 to 59 | 4.3% | 4.8% | 6.7% |
| Age 60 to 64 | 5.9% | 5.9% | 6.3% |
| Age 65 to 74 | 6.9% | 5.9% | 9.6% |
| Age 75 to 84 | 3.3% | 4.9% | 4.5% |
| Age 85 and over | 1.6% | 2.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Watervliet, MI | Hillsdale, MI | United States |
| White | 76.4% | 88.8% | 59.4% |
| Black | 1.1% | 1.3% | 12.2% |
| Asian | 0.2% | 0.6% | 5.6% |
| Native American | 1.7% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 2.5% | 3.9% | 3.2% |
| Hispanic | 18.3% | 4.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Watervliet, MI | Hillsdale, MI | United States |
| Married Population | 53.8% | 34.0% | 49.8% |
| Currently Married | 51.4% | 33.7% | 48.0% |
| Married but Separated | 2.4% | 0.3% | 1.8% |
| Single Population | 46.2% | 66.0% | 50.2% |
| Never Married | 24.8% | 46.0% | 33.8% |
| Divorced | 15.5% | 12.5% | 10.8% |
| Widowed | 6.0% | 7.5% | 5.6% |
| space5 | | | |
| Household Size | 2.73 | 2.36 | 2.60 |
| Households | 696 | 2,903 | 124,010,992 |
| Family Households | 437 | 1,547 | 80,755,759 |
| Married couple, w/children | 35.0% | 33.0% | 30.5% |
| Married couple, no children | 34.3% | 35.4% | 42.9% |
| Non Family Households | 259 | 1,356 | 43,255,233 |
| Single householder, w/children | 18.8% | 22.7% | 15.8% |
| Single householder, no children | 11.9% | 8.9% | 10.8% |