| | New Glarus, WI | New Berlin, WI | United States |
| Population | 2,211 | 40,289 | 329,725,481 |
| Female Population | 54.1% | 49.6% | 50.5% |
| Male Population | 46.0% | 50.4% | 49.5% |
| Median Age | 40 | 46.7 | 38.4 |
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| Population - 2010 | 2,181 | 39,604 | 309,327,143 |
| Population - 2000 | 2,111 | 38,220 | 285,036,114 |
| Population - 1990 | 1,899 | 33,592 | 251,960,433 |
| Pop. 2000 to Now | 1.2% | 4.2% | 15.6% |
| Pop. 1990 to Now | 12.5% | 18.5% | 30.8% |
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| Population Density | 1,219.5 | 1,105.0 | 93.4 |
| Land Area | 1.8 | 36.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | New Glarus, WI | New Berlin, WI | United States |
| Age 0 to 4 | 3.9% | 5.6% | 5.9% |
| Age 5 to 9 | 6.3% | 5.1% | 6.1% |
| Age 10 to 14 | 9.3% | 4.6% | 6.6% |
| Age 15 to 17 | 4.4% | 3.8% | 3.9% |
| Age 18 to 20 | 2.5% | 2.8% | 4.0% |
| Age 21 to 24 | 1.9% | 4.2% | 5.2% |
| Age 25 to 34 | 12.8% | 10.2% | 13.8% |
| Age 35 to 44 | 14.4% | 11.9% | 12.9% |
| Age 45 to 54 | 12.7% | 13.9% | 12.6% |
| Age 55 to 59 | 6.2% | 8.0% | 6.7% |
| Age 60 to 64 | 6.7% | 8.3% | 6.3% |
| Age 65 to 74 | 10.6% | 12.6% | 9.6% |
| Age 75 to 84 | 3.1% | 6.2% | 4.5% |
| Age 85 and over | 5.1% | 2.9% | 1.9% |
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| Race | | | |
| | New Glarus, WI | New Berlin, WI | United States |
| White | 92.8% | 88.7% | 59.4% |
| Black | 0.9% | 1.4% | 12.2% |
| Asian | 0.2% | 4.5% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 1.3% | 2.1% | 3.2% |
| Hispanic | 4.9% | 3.1% | 18.4% |
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| Marriage & Family | | | |
| | New Glarus, WI | New Berlin, WI | United States |
| Married Population | 60.0% | 62.6% | 49.8% |
| Currently Married | 59.6% | 62.1% | 48.0% |
| Married but Separated | 0.3% | 0.5% | 1.8% |
| Single Population | 40.0% | 37.4% | 50.2% |
| Never Married | 22.4% | 22.1% | 33.8% |
| Divorced | 10.8% | 9.5% | 10.8% |
| Widowed | 6.8% | 5.7% | 5.6% |
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| Household Size | 2.43 | 2.31 | 2.60 |
| Households | 886 | 17,341 | 124,010,992 |
| Family Households | 633 | 12,150 | 80,755,759 |
| Married couple, w/children | 33.5% | 29.8% | 30.5% |
| Married couple, no children | 47.4% | 56.6% | 42.9% |
| Non Family Households | 253 | 5,191 | 43,255,233 |
| Single householder, w/children | 15.2% | 8.1% | 15.8% |
| Single householder, no children | 3.9% | 5.4% | 10.8% |