| | Neillsville, WI | Neenah, WI | United States |
| Population | 2,385 | 27,194 | 329,725,481 |
| Female Population | 50.0% | 49.7% | 50.5% |
| Male Population | 50.0% | 50.3% | 49.5% |
| Median Age | 40.8 | 36.9 | 38.4 |
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| Population - 2010 | 2,460 | 25,499 | 309,327,143 |
| Population - 2000 | 2,731 | 24,507 | 285,036,114 |
| Population - 1990 | 2,680 | 23,219 | 251,960,433 |
| Pop. 2000 to Now | -13.0% | 7.6% | 15.6% |
| Pop. 1990 to Now | -11.4% | 13.5% | 30.8% |
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| Population Density | 868.9 | 2,931.7 | 93.4 |
| Land Area | 2.7 | 9.3 | 3,531,905.4 |
| Water Area | 0.1 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Neillsville, WI | Neenah, WI | United States |
| Age 0 to 4 | 7.0% | 6.1% | 5.9% |
| Age 5 to 9 | 5.7% | 7.8% | 6.1% |
| Age 10 to 14 | 6.4% | 7.1% | 6.6% |
| Age 15 to 17 | 5.9% | 4.7% | 3.9% |
| Age 18 to 20 | 2.1% | 3.2% | 4.0% |
| Age 21 to 24 | 2.7% | 4.0% | 5.2% |
| Age 25 to 34 | 11.9% | 14.9% | 13.8% |
| Age 35 to 44 | 11.7% | 12.8% | 12.9% |
| Age 45 to 54 | 11.3% | 13.0% | 12.6% |
| Age 55 to 59 | 6.0% | 6.5% | 6.7% |
| Age 60 to 64 | 8.6% | 6.0% | 6.3% |
| Age 65 to 74 | 8.0% | 8.2% | 9.6% |
| Age 75 to 84 | 6.1% | 3.7% | 4.5% |
| Age 85 and over | 6.6% | 2.1% | 1.9% |
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| Race | | | |
| | Neillsville, WI | Neenah, WI | United States |
| White | 93.5% | 87.0% | 59.4% |
| Black | 1.1% | 3.1% | 12.2% |
| Asian | 0.1% | 1.9% | 5.6% |
| Native American | 0.3% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 3.7% | 2.7% | 3.2% |
| Hispanic | 1.3% | 4.8% | 18.4% |
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| Marriage & Family | | | |
| | Neillsville, WI | Neenah, WI | United States |
| Married Population | 43.1% | 47.7% | 49.8% |
| Currently Married | 42.8% | 46.9% | 48.0% |
| Married but Separated | 0.3% | 0.8% | 1.8% |
| Single Population | 57.0% | 52.3% | 50.2% |
| Never Married | 30.8% | 34.0% | 33.8% |
| Divorced | 18.2% | 13.6% | 10.8% |
| Widowed | 8.0% | 4.6% | 5.6% |
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| Household Size | 2.12 | 2.41 | 2.60 |
| Households | 1,069 | 11,236 | 124,010,992 |
| Family Households | 505 | 7,158 | 80,755,759 |
| Married couple, w/children | 36.6% | 29.4% | 30.5% |
| Married couple, no children | 42.6% | 39.6% | 42.9% |
| Non Family Households | 564 | 4,078 | 43,255,233 |
| Single householder, w/children | 17.8% | 20.1% | 15.8% |
| Single householder, no children | 3.0% | 10.9% | 10.8% |