| | Petoskey, MI | Rochester, MI | United States |
| Population | 5,856 | 13,048 | 329,725,481 |
| Female Population | 52.3% | 51.4% | 50.5% |
| Male Population | 47.7% | 48.7% | 49.5% |
| Median Age | 41.9 | 39.4 | 38.4 |
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| Population - 2010 | 5,656 | 12,718 | 309,327,143 |
| Population - 2000 | 6,080 | 10,467 | 285,036,114 |
| Population - 1990 | 6,056 | 7,130 | 251,960,433 |
| Pop. 2000 to Now | -5.8% | 26.1% | 15.6% |
| Pop. 1990 to Now | -5.4% | 85.2% | 30.8% |
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| Population Density | 1,140.9 | 3,405.9 | 93.4 |
| Land Area | 5.1 | 3.8 | 3,531,905.4 |
| Water Area | 0.2 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Petoskey, MI | Rochester, MI | United States |
| Age 0 to 4 | 4.8% | 6.6% | 5.9% |
| Age 5 to 9 | 5.1% | 7.0% | 6.1% |
| Age 10 to 14 | 6.6% | 7.0% | 6.6% |
| Age 15 to 17 | 4.2% | 3.2% | 3.9% |
| Age 18 to 20 | 3.6% | 3.6% | 4.0% |
| Age 21 to 24 | 4.4% | 4.5% | 5.2% |
| Age 25 to 34 | 13.4% | 11.9% | 13.8% |
| Age 35 to 44 | 12.3% | 14.0% | 12.9% |
| Age 45 to 54 | 11.4% | 15.6% | 12.6% |
| Age 55 to 59 | 5.3% | 9.0% | 6.7% |
| Age 60 to 64 | 9.1% | 4.0% | 6.3% |
| Age 65 to 74 | 11.6% | 6.9% | 9.6% |
| Age 75 to 84 | 5.4% | 5.1% | 4.5% |
| Age 85 and over | 3.0% | 1.7% | 1.9% |
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| Race | | | |
| | Petoskey, MI | Rochester, MI | United States |
| White | 90.1% | 84.9% | 59.4% |
| Black | 0.8% | 1.8% | 12.2% |
| Asian | 0.1% | 6.1% | 5.6% |
| Native American | 1.4% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 5.1% | 4.8% | 3.2% |
| Hispanic | 2.5% | 2.3% | 18.4% |
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| Marriage & Family | | | |
| | Petoskey, MI | Rochester, MI | United States |
| Married Population | 45.1% | 58.9% | 49.8% |
| Currently Married | 44.4% | 58.1% | 48.0% |
| Married but Separated | 0.7% | 0.9% | 1.8% |
| Single Population | 54.9% | 41.1% | 50.2% |
| Never Married | 31.0% | 26.9% | 33.8% |
| Divorced | 18.3% | 7.9% | 10.8% |
| Widowed | 5.6% | 6.2% | 5.6% |
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| Household Size | 2.10 | 2.43 | 2.60 |
| Households | 2,645 | 5,370 | 124,010,992 |
| Family Households | 1,487 | 3,486 | 80,755,759 |
| Married couple, w/children | 29.7% | 36.9% | 30.5% |
| Married couple, no children | 34.9% | 47.6% | 42.9% |
| Non Family Households | 1,158 | 1,884 | 43,255,233 |
| Single householder, w/children | 23.5% | 8.4% | 15.8% |
| Single householder, no children | 12.0% | 7.1% | 10.8% |