| | Fenton, MI | Peru, IN | United States |
| Population | 11,949 | 11,123 | 329,725,481 |
| Female Population | 55.6% | 50.1% | 50.5% |
| Male Population | 44.4% | 49.9% | 49.5% |
| Median Age | 38.2 | 41.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 11,723 | 11,552 | 309,327,143 |
| Population - 2000 | 10,582 | 12,994 | 285,036,114 |
| Population - 1990 | 8,444 | 12,843 | 251,960,433 |
| Pop. 2000 to Now | 7.5% | -15.8% | 15.6% |
| Pop. 1990 to Now | 34.7% | -14.8% | 30.8% |
| space4 | | | |
| Population Density | 1,796.6 | 2,180.1 | 93.4 |
| Land Area | 6.7 | 5.1 | 3,531,905.4 |
| Water Area | 0.3 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Fenton, MI | Peru, IN | United States |
| Age 0 to 4 | 5.8% | 4.9% | 5.9% |
| Age 5 to 9 | 6.4% | 5.4% | 6.1% |
| Age 10 to 14 | 7.6% | 6.5% | 6.6% |
| Age 15 to 17 | 3.5% | 4.4% | 3.9% |
| Age 18 to 20 | 3.0% | 4.3% | 4.0% |
| Age 21 to 24 | 3.5% | 5.7% | 5.2% |
| Age 25 to 34 | 17.2% | 10.3% | 13.8% |
| Age 35 to 44 | 14.4% | 12.3% | 12.9% |
| Age 45 to 54 | 11.4% | 14.9% | 12.6% |
| Age 55 to 59 | 5.5% | 6.2% | 6.7% |
| Age 60 to 64 | 5.4% | 6.4% | 6.3% |
| Age 65 to 74 | 9.2% | 11.7% | 9.6% |
| Age 75 to 84 | 4.6% | 4.0% | 4.5% |
| Age 85 and over | 2.7% | 2.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Fenton, MI | Peru, IN | United States |
| White | 89.5% | 86.3% | 59.4% |
| Black | 1.3% | 6.1% | 12.2% |
| Asian | 0.5% | 0.1% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.1% | 0.4% |
| Two or More Races | 3.3% | 3.0% | 3.2% |
| Hispanic | 5.1% | 4.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Fenton, MI | Peru, IN | United States |
| Married Population | 49.7% | 44.1% | 49.8% |
| Currently Married | 48.6% | 42.2% | 48.0% |
| Married but Separated | 1.1% | 1.9% | 1.8% |
| Single Population | 50.3% | 55.9% | 50.2% |
| Never Married | 27.6% | 29.9% | 33.8% |
| Divorced | 15.1% | 18.8% | 10.8% |
| Widowed | 7.5% | 7.2% | 5.6% |
| space5 | | | |
| Household Size | 2.34 | 2.44 | 2.60 |
| Households | 5,025 | 4,491 | 124,010,992 |
| Family Households | 3,060 | 2,800 | 80,755,759 |
| Married couple, w/children | 28.5% | 23.3% | 30.5% |
| Married couple, no children | 47.0% | 44.1% | 42.9% |
| Non Family Households | 1,965 | 1,691 | 43,255,233 |
| Single householder, w/children | 16.8% | 23.4% | 15.8% |
| Single householder, no children | 7.8% | 9.1% | 10.8% |