| | Henderson, TN | McKinleyville, CA | United States |
| Population | 6,232 | 16,457 | 329,725,481 |
| Female Population | 51.7% | 50.3% | 50.5% |
| Male Population | 48.3% | 49.8% | 49.5% |
| Median Age | 26.9 | 37.4 | 38.4 |
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| Population - 2010 | 6,320 | 16,896 | 309,327,143 |
| Population - 2000 | 5,670 | 13,599 | 285,036,114 |
| Population - 1990 | 4,760 | 10,749 | 251,960,433 |
| Pop. 2000 to Now | 13.2% | 24.6% | 15.6% |
| Pop. 1990 to Now | 34.8% | 57.6% | 30.8% |
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| Population Density | 798.5 | 790.0 | 93.4 |
| Land Area | 7.8 | 20.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Henderson, TN | McKinleyville, CA | United States |
| Age 0 to 4 | 5.5% | 7.6% | 5.9% |
| Age 5 to 9 | 8.1% | 7.2% | 6.1% |
| Age 10 to 14 | 6.7% | 4.0% | 6.6% |
| Age 15 to 17 | 3.3% | 3.1% | 3.9% |
| Age 18 to 20 | 12.8% | 5.5% | 4.0% |
| Age 21 to 24 | 9.7% | 6.0% | 5.2% |
| Age 25 to 34 | 12.3% | 14.3% | 13.8% |
| Age 35 to 44 | 9.8% | 13.6% | 12.9% |
| Age 45 to 54 | 11.3% | 10.5% | 12.6% |
| Age 55 to 59 | 3.3% | 5.0% | 6.7% |
| Age 60 to 64 | 2.2% | 7.8% | 6.3% |
| Age 65 to 74 | 8.5% | 9.7% | 9.6% |
| Age 75 to 84 | 3.9% | 4.4% | 4.5% |
| Age 85 and over | 2.6% | 1.3% | 1.9% |
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| Race | | | |
| | Henderson, TN | McKinleyville, CA | United States |
| White | 68.6% | 71.2% | 59.4% |
| Black | 22.2% | 0.4% | 12.2% |
| Asian | 1.2% | 4.4% | 5.6% |
| Native American | 0.0% | 4.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.7% | 0.0% | 0.4% |
| Two or More Races | 1.4% | 9.5% | 3.2% |
| Hispanic | 6.0% | 10.3% | 18.4% |
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| Marriage & Family | | | |
| | Henderson, TN | McKinleyville, CA | United States |
| Married Population | 34.1% | 45.5% | 49.8% |
| Currently Married | 31.3% | 44.3% | 48.0% |
| Married but Separated | 2.7% | 1.3% | 1.8% |
| Single Population | 65.9% | 54.5% | 50.2% |
| Never Married | 44.8% | 37.1% | 33.8% |
| Divorced | 13.8% | 11.9% | 10.8% |
| Widowed | 7.4% | 5.4% | 5.6% |
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| Household Size | 2.66 | 2.55 | 2.60 |
| Households | 1,859 | 6,442 | 124,010,992 |
| Family Households | 1,201 | 3,469 | 80,755,759 |
| Married couple, w/children | 31.7% | 34.2% | 30.5% |
| Married couple, no children | 29.1% | 43.2% | 42.9% |
| Non Family Households | 658 | 2,973 | 43,255,233 |
| Single householder, w/children | 32.6% | 14.5% | 15.8% |
| Single householder, no children | 6.7% | 8.0% | 10.8% |