| | St. Germain, WI | New Iberia, LA | United States |
| Population | 2,161 | 28,844 | 329,725,481 |
| Female Population | 46.6% | 50.4% | 50.5% |
| Male Population | 53.4% | 49.6% | 49.5% |
| Median Age | 57 | 34.4 | 38.4 |
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| Population - 2010 | 2,086 | 30,600 | 309,327,143 |
| Population - 2000 | 1,932 | 32,623 | 285,036,114 |
| Population - 1990 | 1,319 | 31,828 | 251,960,433 |
| Pop. 2000 to Now | 12.1% | -14.1% | 15.6% |
| Pop. 1990 to Now | 64.2% | -11.9% | 30.8% |
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| Population Density | 64.3 | 2,589.5 | 93.4 |
| Land Area | 33.6 | 11.1 | 3,531,905.4 |
| Water Area | 6.4 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | St. Germain, WI | New Iberia, LA | United States |
| Age 0 to 4 | 7.3% | 9.4% | 5.9% |
| Age 5 to 9 | 2.3% | 7.8% | 6.1% |
| Age 10 to 14 | 2.9% | 7.6% | 6.6% |
| Age 15 to 17 | 1.2% | 3.3% | 3.9% |
| Age 18 to 20 | 0.1% | 3.9% | 4.0% |
| Age 21 to 24 | 2.8% | 4.7% | 5.2% |
| Age 25 to 34 | 6.5% | 14.0% | 13.8% |
| Age 35 to 44 | 9.6% | 11.1% | 12.9% |
| Age 45 to 54 | 15.2% | 12.3% | 12.6% |
| Age 55 to 59 | 14.8% | 4.8% | 6.7% |
| Age 60 to 64 | 10.5% | 6.7% | 6.3% |
| Age 65 to 74 | 16.7% | 8.8% | 9.6% |
| Age 75 to 84 | 7.6% | 3.9% | 4.5% |
| Age 85 and over | 2.5% | 1.9% | 1.9% |
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| Race | | | |
| | St. Germain, WI | New Iberia, LA | United States |
| White | 88.1% | 47.6% | 59.4% |
| Black | 1.4% | 42.9% | 12.2% |
| Asian | 0.4% | 1.0% | 5.6% |
| Native American | 3.6% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 3.7% | 4.0% | 3.2% |
| Hispanic | 2.9% | 4.3% | 18.4% |
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| Marriage & Family | | | |
| | St. Germain, WI | New Iberia, LA | United States |
| Married Population | 58.9% | 43.1% | 49.8% |
| Currently Married | 57.7% | 39.6% | 48.0% |
| Married but Separated | 1.3% | 3.5% | 1.8% |
| Single Population | 41.1% | 56.9% | 50.2% |
| Never Married | 14.2% | 38.9% | 33.8% |
| Divorced | 21.2% | 11.9% | 10.8% |
| Widowed | 5.7% | 6.1% | 5.6% |
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| Household Size | 1.99 | 2.53 | 2.60 |
| Households | 1,087 | 11,253 | 124,010,992 |
| Family Households | 666 | 7,284 | 80,755,759 |
| Married couple, w/children | 12.8% | 21.5% | 30.5% |
| Married couple, no children | 68.9% | 32.4% | 42.9% |
| Non Family Households | 421 | 3,969 | 43,255,233 |
| Single householder, w/children | 12.0% | 31.8% | 15.8% |
| Single householder, no children | 6.3% | 14.3% | 10.8% |