| | Olivet, MI | Hillman, MI | United States |
| Population | 1,610 | 665 | 329,725,481 |
| Female Population | 42.6% | 60.0% | 50.5% |
| Male Population | 57.4% | 40.0% | 49.5% |
| Median Age | 20.8 | 57.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,596 | 702 | 309,327,143 |
| Population - 2000 | 1,758 | 685 | 285,036,114 |
| Population - 1990 | 1,604 | 643 | 251,960,433 |
| Pop. 2000 to Now | 5.7% | -2.0% | 15.6% |
| Pop. 1990 to Now | 15.8% | 4.4% | 30.8% |
| space4 | | | |
| Population Density | 1,578.4 | 407.0 | 93.4 |
| Land Area | 1.0 | 1.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Olivet, MI | Hillman, MI | United States |
| Age 0 to 4 | 3.5% | 2.3% | 5.9% |
| Age 5 to 9 | 2.9% | 5.3% | 6.1% |
| Age 10 to 14 | 3.7% | 4.2% | 6.6% |
| Age 15 to 17 | 1.7% | 2.9% | 3.9% |
| Age 18 to 20 | 39.8% | 2.7% | 4.0% |
| Age 21 to 24 | 14.2% | 2.1% | 5.2% |
| Age 25 to 34 | 7.3% | 7.4% | 13.8% |
| Age 35 to 44 | 7.8% | 8.4% | 12.9% |
| Age 45 to 54 | 5.0% | 10.4% | 12.6% |
| Age 55 to 59 | 4.5% | 9.3% | 6.7% |
| Age 60 to 64 | 4.3% | 11.3% | 6.3% |
| Age 65 to 74 | 3.8% | 17.7% | 9.6% |
| Age 75 to 84 | 1.2% | 8.9% | 4.5% |
| Age 85 and over | 0.4% | 7.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Olivet, MI | Hillman, MI | United States |
| White | 80.6% | 93.8% | 59.4% |
| Black | 13.7% | 1.1% | 12.2% |
| Asian | 0.5% | 0.0% | 5.6% |
| Native American | 0.0% | 2.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.5% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 2.6% | 3.2% |
| Hispanic | 3.4% | 0.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Olivet, MI | Hillman, MI | United States |
| Married Population | 18.4% | 44.6% | 49.8% |
| Currently Married | 17.5% | 43.4% | 48.0% |
| Married but Separated | 0.9% | 1.2% | 1.8% |
| Single Population | 81.6% | 55.4% | 50.2% |
| Never Married | 69.1% | 22.1% | 33.8% |
| Divorced | 10.1% | 21.3% | 10.8% |
| Widowed | 2.4% | 11.9% | 5.6% |
| space5 | | | |
| Household Size | 2.27 | 1.87 | 2.60 |
| Households | 403 | 307 | 124,010,992 |
| Family Households | 244 | 152 | 80,755,759 |
| Married couple, w/children | 23.0% | 19.7% | 30.5% |
| Married couple, no children | 25.4% | 53.3% | 42.9% |
| Non Family Households | 159 | 155 | 43,255,233 |
| Single householder, w/children | 20.9% | 16.4% | 15.8% |
| Single householder, no children | 30.7% | 10.5% | 10.8% |