| | Oostburg, WI | Chilton, WI | United States |
| Population | 3,048 | 4,054 | 329,725,481 |
| Female Population | 53.0% | 45.9% | 50.5% |
| Male Population | 47.0% | 54.1% | 49.5% |
| Median Age | 43.9 | 41.3 | 38.4 |
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| Population - 2010 | 2,912 | 3,932 | 309,327,143 |
| Population - 2000 | 2,660 | 3,708 | 285,036,114 |
| Population - 1990 | 1,931 | 3,240 | 251,960,433 |
| Pop. 2000 to Now | 15.9% | 4.3% | 15.6% |
| Pop. 1990 to Now | 59.6% | 19.4% | 30.8% |
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| Population Density | 1,555.9 | 1,020.4 | 93.4 |
| Land Area | 2.0 | 4.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Oostburg, WI | Chilton, WI | United States |
| Age 0 to 4 | 5.1% | 4.3% | 5.9% |
| Age 5 to 9 | 7.1% | 9.8% | 6.1% |
| Age 10 to 14 | 6.6% | 7.3% | 6.6% |
| Age 15 to 17 | 5.3% | 2.9% | 3.9% |
| Age 18 to 20 | 3.3% | 2.1% | 4.0% |
| Age 21 to 24 | 4.8% | 2.2% | 5.2% |
| Age 25 to 34 | 8.6% | 14.7% | 13.8% |
| Age 35 to 44 | 9.9% | 13.0% | 12.9% |
| Age 45 to 54 | 16.3% | 7.9% | 12.6% |
| Age 55 to 59 | 6.6% | 12.0% | 6.7% |
| Age 60 to 64 | 7.2% | 6.4% | 6.3% |
| Age 65 to 74 | 10.7% | 8.9% | 9.6% |
| Age 75 to 84 | 6.3% | 5.3% | 4.5% |
| Age 85 and over | 2.2% | 3.2% | 1.9% |
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| Race | | | |
| | Oostburg, WI | Chilton, WI | United States |
| White | 88.8% | 93.2% | 59.4% |
| Black | 0.0% | 1.0% | 12.2% |
| Asian | 0.5% | 0.0% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.0% | 0.4% |
| Two or More Races | 4.1% | 2.1% | 3.2% |
| Hispanic | 6.1% | 3.4% | 18.4% |
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| Marriage & Family | | | |
| | Oostburg, WI | Chilton, WI | United States |
| Married Population | 64.2% | 52.3% | 49.8% |
| Currently Married | 64.1% | 51.9% | 48.0% |
| Married but Separated | 0.2% | 0.4% | 1.8% |
| Single Population | 35.8% | 47.7% | 50.2% |
| Never Married | 22.7% | 27.5% | 33.8% |
| Divorced | 8.0% | 12.7% | 10.8% |
| Widowed | 5.0% | 7.5% | 5.6% |
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| Household Size | 2.49 | 2.42 | 2.60 |
| Households | 1,222 | 1,630 | 124,010,992 |
| Family Households | 866 | 999 | 80,755,759 |
| Married couple, w/children | 32.9% | 28.4% | 30.5% |
| Married couple, no children | 58.7% | 46.0% | 42.9% |
| Non Family Households | 356 | 631 | 43,255,233 |
| Single householder, w/children | 6.8% | 17.0% | 15.8% |
| Single householder, no children | 1.6% | 8.5% | 10.8% |