| | Winfield, IN | Valparaiso, IN | United States |
| Population | 6,924 | 33,820 | 329,725,481 |
| Female Population | 44.8% | 52.0% | 50.5% |
| Male Population | 55.2% | 48.0% | 49.5% |
| Median Age | 37.9 | 36.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,572 | 31,792 | 309,327,143 |
| Population - 2000 | 2,298 | 27,428 | 285,036,114 |
| Population - 1990 | 1,510 | 24,414 | 251,960,433 |
| Pop. 2000 to Now | 172.6% | 23.8% | 15.6% |
| Pop. 1990 to Now | 314.9% | 39.0% | 30.8% |
| space4 | | | |
| Population Density | 559.5 | 2,072.8 | 93.4 |
| Land Area | 12.4 | 16.3 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Winfield, IN | Valparaiso, IN | United States |
| Age 0 to 4 | 7.2% | 5.6% | 5.9% |
| Age 5 to 9 | 7.9% | 5.4% | 6.1% |
| Age 10 to 14 | 9.3% | 4.1% | 6.6% |
| Age 15 to 17 | 5.4% | 3.8% | 3.9% |
| Age 18 to 20 | 4.7% | 6.3% | 4.0% |
| Age 21 to 24 | 4.0% | 8.9% | 5.2% |
| Age 25 to 34 | 9.2% | 12.6% | 13.8% |
| Age 35 to 44 | 11.2% | 13.4% | 12.9% |
| Age 45 to 54 | 19.9% | 10.8% | 12.6% |
| Age 55 to 59 | 4.5% | 5.5% | 6.7% |
| Age 60 to 64 | 2.2% | 6.3% | 6.3% |
| Age 65 to 74 | 4.8% | 9.4% | 9.6% |
| Age 75 to 84 | 5.8% | 4.8% | 4.5% |
| Age 85 and over | 3.8% | 3.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Winfield, IN | Valparaiso, IN | United States |
| White | 78.6% | 81.2% | 59.4% |
| Black | 6.4% | 4.0% | 12.2% |
| Asian | 2.3% | 2.8% | 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 | 3.8% | 2.8% | 3.2% |
| Hispanic | 8.8% | 9.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Winfield, IN | Valparaiso, IN | United States |
| Married Population | 58.5% | 44.5% | 49.8% |
| Currently Married | 57.0% | 42.9% | 48.0% |
| Married but Separated | 1.5% | 1.6% | 1.8% |
| Single Population | 41.5% | 55.5% | 50.2% |
| Never Married | 27.3% | 37.5% | 33.8% |
| Divorced | 3.9% | 10.5% | 10.8% |
| Widowed | 10.4% | 7.5% | 5.6% |
| space5 | | | |
| Household Size | 3.16 | 2.16 | 2.60 |
| Households | 2,152 | 14,179 | 124,010,992 |
| Family Households | 1,637 | 7,556 | 80,755,759 |
| Married couple, w/children | 56.8% | 30.9% | 30.5% |
| Married couple, no children | 30.8% | 47.5% | 42.9% |
| Non Family Households | 515 | 6,623 | 43,255,233 |
| Single householder, w/children | 11.1% | 15.7% | 15.8% |
| Single householder, no children | 1.3% | 5.9% | 10.8% |