| | Neenah, WI | St. Charles, MO | United States |
| Population | 27,194 | 70,218 | 329,725,481 |
| Female Population | 49.7% | 51.7% | 50.5% |
| Male Population | 50.3% | 48.3% | 49.5% |
| Median Age | 36.9 | 37.7 | 38.4 |
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| Population - 2010 | 25,499 | 66,387 | 309,327,143 |
| Population - 2000 | 24,507 | 60,321 | 285,036,114 |
| Population - 1990 | 23,219 | 54,555 | 251,960,433 |
| Pop. 2000 to Now | 7.6% | 19.0% | 15.6% |
| Pop. 1990 to Now | 13.5% | 31.5% | 30.8% |
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| Population Density | 2,931.7 | 2,844.3 | 93.4 |
| Land Area | 9.3 | 24.7 | 3,531,905.4 |
| Water Area | 0.4 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Neenah, WI | St. Charles, MO | United States |
| Age 0 to 4 | 6.1% | 5.3% | 5.9% |
| Age 5 to 9 | 7.8% | 5.3% | 6.1% |
| Age 10 to 14 | 7.1% | 4.2% | 6.6% |
| Age 15 to 17 | 4.7% | 2.6% | 3.9% |
| Age 18 to 20 | 3.2% | 5.1% | 4.0% |
| Age 21 to 24 | 4.0% | 7.8% | 5.2% |
| Age 25 to 34 | 14.9% | 16.3% | 13.8% |
| Age 35 to 44 | 12.8% | 12.0% | 12.9% |
| Age 45 to 54 | 13.0% | 9.9% | 12.6% |
| Age 55 to 59 | 6.5% | 7.6% | 6.7% |
| Age 60 to 64 | 6.0% | 6.8% | 6.3% |
| Age 65 to 74 | 8.2% | 9.9% | 9.6% |
| Age 75 to 84 | 3.7% | 5.2% | 4.5% |
| Age 85 and over | 2.1% | 2.2% | 1.9% |
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| Race | | | |
| | Neenah, WI | St. Charles, MO | United States |
| White | 87.0% | 81.3% | 59.4% |
| Black | 3.1% | 6.6% | 12.2% |
| Asian | 1.9% | 3.3% | 5.6% |
| Native American | 0.4% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.2% | 0.4% |
| Two or More Races | 2.7% | 3.0% | 3.2% |
| Hispanic | 4.8% | 5.5% | 18.4% |
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| Marriage & Family | | | |
| | Neenah, WI | St. Charles, MO | United States |
| Married Population | 47.7% | 49.1% | 49.8% |
| Currently Married | 46.9% | 48.1% | 48.0% |
| Married but Separated | 0.8% | 1.1% | 1.8% |
| Single Population | 52.3% | 50.9% | 50.2% |
| Never Married | 34.0% | 33.8% | 33.8% |
| Divorced | 13.6% | 11.6% | 10.8% |
| Widowed | 4.6% | 5.4% | 5.6% |
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| Household Size | 2.41 | 2.21 | 2.60 |
| Households | 11,236 | 29,173 | 124,010,992 |
| Family Households | 7,158 | 17,129 | 80,755,759 |
| Married couple, w/children | 29.4% | 27.7% | 30.5% |
| Married couple, no children | 39.6% | 52.2% | 42.9% |
| Non Family Households | 4,078 | 12,044 | 43,255,233 |
| Single householder, w/children | 20.1% | 12.1% | 15.8% |
| Single householder, no children | 10.9% | 8.1% | 10.8% |