| | Trego, WI | Ogema, WI | United States |
| Population | 745 | 807 | 329,725,481 |
| Female Population | 54.5% | 43.5% | 50.5% |
| Male Population | 45.5% | 56.5% | 49.5% |
| Median Age | 54 | 49.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 936 | 711 | 309,327,143 |
| Population - 2000 | 885 | 882 | 285,036,114 |
| Population - 1990 | 709 | 860 | 251,960,433 |
| Pop. 2000 to Now | 3.2% | -23.5% | 15.6% |
| Pop. 1990 to Now | 28.8% | -21.5% | 30.8% |
| space4 | | | |
| Population Density | 21.2 | 10.0 | 93.4 |
| Land Area | 35.2 | 80.4 | 3,531,905.4 |
| Water Area | 1.6 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Trego, WI | Ogema, WI | United States |
| Age 0 to 4 | 1.7% | 1.5% | 5.9% |
| Age 5 to 9 | 5.5% | 3.0% | 6.1% |
| Age 10 to 14 | 4.3% | 7.9% | 6.6% |
| Age 15 to 17 | 3.8% | 3.1% | 3.9% |
| Age 18 to 20 | 1.9% | 3.6% | 4.0% |
| Age 21 to 24 | 1.7% | 4.5% | 5.2% |
| Age 25 to 34 | 7.8% | 6.9% | 13.8% |
| Age 35 to 44 | 9.3% | 13.3% | 12.9% |
| Age 45 to 54 | 17.0% | 12.6% | 12.6% |
| Age 55 to 59 | 7.7% | 9.8% | 6.7% |
| Age 60 to 64 | 10.1% | 8.8% | 6.3% |
| Age 65 to 74 | 23.0% | 12.6% | 9.6% |
| Age 75 to 84 | 5.5% | 5.5% | 4.5% |
| Age 85 and over | 0.8% | 6.9% | 1.9% |
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| Race | | | |
| | Trego, WI | Ogema, WI | United States |
| White | 96.0% | 91.2% | 59.4% |
| Black | 0.0% | 3.1% | 12.2% |
| Asian | 0.0% | 0.2% | 5.6% |
| Native American | 2.3% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.6% | 0.4% |
| Two or More Races | 1.6% | 3.2% | 3.2% |
| Hispanic | 0.1% | 1.5% | 18.4% |
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| Marriage & Family | | | |
| | Trego, WI | Ogema, WI | United States |
| Married Population | 65.7% | 52.8% | 49.8% |
| Currently Married | 63.6% | 51.9% | 48.0% |
| Married but Separated | 2.1% | 0.8% | 1.8% |
| Single Population | 34.3% | 47.2% | 50.2% |
| Never Married | 17.5% | 25.3% | 33.8% |
| Divorced | 10.2% | 10.3% | 10.8% |
| Widowed | 6.7% | 11.6% | 5.6% |
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| Household Size | 2.40 | 2.19 | 2.60 |
| Households | 310 | 366 | 124,010,992 |
| Family Households | 200 | 190 | 80,755,759 |
| Married couple, w/children | 16.5% | 20.5% | 30.5% |
| Married couple, no children | 77.0% | 69.5% | 42.9% |
| Non Family Households | 110 | 176 | 43,255,233 |
| Single householder, w/children | 4.0% | 8.9% | 15.8% |
| Single householder, no children | 2.5% | 1.1% | 10.8% |