| | Greenfield, WI | Newport, TN | United States |
| Population | 37,623 | 6,845 | 329,725,481 |
| Female Population | 52.3% | 56.5% | 50.5% |
| Male Population | 47.7% | 43.5% | 49.5% |
| Median Age | 43.7 | 38.6 | 38.4 |
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| Population - 2010 | 36,778 | 6,900 | 309,327,143 |
| Population - 2000 | 35,476 | 7,242 | 285,036,114 |
| Population - 1990 | 33,403 | 7,123 | 251,960,433 |
| Pop. 2000 to Now | 4.8% | -4.8% | 15.6% |
| Pop. 1990 to Now | 11.3% | -3.2% | 30.8% |
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| Population Density | 3,262.5 | 1,238.0 | 93.4 |
| Land Area | 11.5 | 5.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Greenfield, WI | Newport, TN | United States |
| Age 0 to 4 | 4.6% | 10.1% | 5.9% |
| Age 5 to 9 | 5.5% | 5.0% | 6.1% |
| Age 10 to 14 | 4.8% | 6.2% | 6.6% |
| Age 15 to 17 | 2.5% | 4.2% | 3.9% |
| Age 18 to 20 | 2.1% | 2.8% | 4.0% |
| Age 21 to 24 | 3.1% | 7.1% | 5.2% |
| Age 25 to 34 | 16.0% | 13.0% | 13.8% |
| Age 35 to 44 | 13.0% | 7.4% | 12.9% |
| Age 45 to 54 | 12.0% | 15.2% | 12.6% |
| Age 55 to 59 | 7.4% | 4.5% | 6.7% |
| Age 60 to 64 | 7.8% | 6.5% | 6.3% |
| Age 65 to 74 | 12.0% | 11.3% | 9.6% |
| Age 75 to 84 | 5.8% | 5.3% | 4.5% |
| Age 85 and over | 3.6% | 1.3% | 1.9% |
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| Race | | | |
| | Greenfield, WI | Newport, TN | United States |
| White | 72.1% | 84.5% | 59.4% |
| Black | 5.1% | 1.0% | 12.2% |
| Asian | 5.1% | 2.5% | 5.6% |
| Native American | 0.3% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.5% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 3.7% | 4.4% | 3.2% |
| Hispanic | 13.4% | 6.7% | 18.4% |
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| Marriage & Family | | | |
| | Greenfield, WI | Newport, TN | United States |
| Married Population | 44.7% | 46.4% | 49.8% |
| Currently Married | 43.8% | 44.9% | 48.0% |
| Married but Separated | 1.0% | 1.4% | 1.8% |
| Single Population | 55.3% | 53.7% | 50.2% |
| Never Married | 34.4% | 24.9% | 33.8% |
| Divorced | 13.6% | 17.2% | 10.8% |
| Widowed | 7.3% | 11.5% | 5.6% |
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| Household Size | 2.08 | 2.53 | 2.60 |
| Households | 17,909 | 2,611 | 124,010,992 |
| Family Households | 9,048 | 1,688 | 80,755,759 |
| Married couple, w/children | 25.7% | 24.1% | 30.5% |
| Married couple, no children | 47.2% | 39.1% | 42.9% |
| Non Family Households | 8,861 | 923 | 43,255,233 |
| Single householder, w/children | 13.3% | 20.9% | 15.8% |
| Single householder, no children | 13.9% | 15.9% | 10.8% |