| | Ferndale, MI | Rutherfordton, NC | United States |
| Population | 19,414 | 3,668 | 329,725,481 |
| Female Population | 48.9% | 55.1% | 50.5% |
| Male Population | 51.1% | 44.9% | 49.5% |
| Median Age | 35.1 | 43.2 | 38.4 |
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| Population - 2010 | 19,901 | 4,178 | 309,327,143 |
| Population - 2000 | 22,105 | 4,131 | 285,036,114 |
| Population - 1990 | 25,084 | 3,617 | 251,960,433 |
| Pop. 2000 to Now | -8.6% | -1.0% | 15.6% |
| Pop. 1990 to Now | -19.5% | 13.1% | 30.8% |
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| Population Density | 5,007.5 | 890.3 | 93.4 |
| Land Area | 3.9 | 4.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Ferndale, MI | Rutherfordton, NC | United States |
| Age 0 to 4 | 4.6% | 6.1% | 5.9% |
| Age 5 to 9 | 1.6% | 10.1% | 6.1% |
| Age 10 to 14 | 2.6% | 3.5% | 6.6% |
| Age 15 to 17 | 1.4% | 1.7% | 3.9% |
| Age 18 to 20 | 0.5% | 1.0% | 4.0% |
| Age 21 to 24 | 5.8% | 2.3% | 5.2% |
| Age 25 to 34 | 33.2% | 15.0% | 13.8% |
| Age 35 to 44 | 16.7% | 13.1% | 12.9% |
| Age 45 to 54 | 13.4% | 4.3% | 12.6% |
| Age 55 to 59 | 5.4% | 7.2% | 6.7% |
| Age 60 to 64 | 5.3% | 7.6% | 6.3% |
| Age 65 to 74 | 6.3% | 15.5% | 9.6% |
| Age 75 to 84 | 2.2% | 10.0% | 4.5% |
| Age 85 and over | 1.0% | 2.8% | 1.9% |
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| Race | | | |
| | Ferndale, MI | Rutherfordton, NC | United States |
| White | 83.8% | 84.0% | 59.4% |
| Black | 5.3% | 4.9% | 12.2% |
| Asian | 2.2% | 0.2% | 5.6% |
| Native American | 0.5% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.1% | 0.1% | 0.4% |
| Two or More Races | 3.7% | 6.6% | 3.2% |
| Hispanic | 3.4% | 4.0% | 18.4% |
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| Marriage & Family | | | |
| | Ferndale, MI | Rutherfordton, NC | United States |
| Married Population | 34.7% | 47.5% | 49.8% |
| Currently Married | 34.2% | 41.4% | 48.0% |
| Married but Separated | 0.5% | 6.1% | 1.8% |
| Single Population | 65.3% | 52.5% | 50.2% |
| Never Married | 52.3% | 27.0% | 33.8% |
| Divorced | 10.3% | 16.9% | 10.8% |
| Widowed | 2.7% | 8.6% | 5.6% |
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| Household Size | 1.90 | 2.21 | 2.60 |
| Households | 10,214 | 1,533 | 124,010,992 |
| Family Households | 3,709 | 802 | 80,755,759 |
| Married couple, w/children | 27.6% | 23.1% | 30.5% |
| Married couple, no children | 50.8% | 46.0% | 42.9% |
| Non Family Households | 6,505 | 731 | 43,255,233 |
| Single householder, w/children | 11.3% | 23.7% | 15.8% |
| Single householder, no children | 10.2% | 7.2% | 10.8% |