| | Pleasant Prairie, WI | Sparta, WI | United States |
| Population | 21,193 | 9,955 | 329,725,481 |
| Female Population | 50.2% | 50.1% | 50.5% |
| Male Population | 49.8% | 49.9% | 49.5% |
| Median Age | 43.4 | 39.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 19,758 | 9,539 | 309,327,143 |
| Population - 2000 | 16,136 | 8,648 | 285,036,114 |
| Population - 1990 | 11,961 | 7,788 | 251,960,433 |
| Pop. 2000 to Now | 32.5% | 13.3% | 15.6% |
| Pop. 1990 to Now | 78.7% | 25.8% | 30.8% |
| space4 | | | |
| Population Density | 634.9 | 1,254.1 | 93.4 |
| Land Area | 33.4 | 7.9 | 3,531,905.4 |
| Water Area | 0.3 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Pleasant Prairie, WI | Sparta, WI | United States |
| Age 0 to 4 | 5.0% | 5.3% | 5.9% |
| Age 5 to 9 | 4.5% | 6.6% | 6.1% |
| Age 10 to 14 | 8.1% | 7.3% | 6.6% |
| Age 15 to 17 | 3.5% | 5.3% | 3.9% |
| Age 18 to 20 | 2.9% | 2.4% | 4.0% |
| Age 21 to 24 | 4.9% | 3.6% | 5.2% |
| Age 25 to 34 | 11.7% | 14.3% | 13.8% |
| Age 35 to 44 | 11.2% | 12.6% | 12.9% |
| Age 45 to 54 | 15.6% | 12.9% | 12.6% |
| Age 55 to 59 | 8.2% | 8.0% | 6.7% |
| Age 60 to 64 | 6.8% | 6.5% | 6.3% |
| Age 65 to 74 | 12.5% | 10.0% | 9.6% |
| Age 75 to 84 | 3.5% | 3.8% | 4.5% |
| Age 85 and over | 1.8% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Pleasant Prairie, WI | Sparta, WI | United States |
| White | 85.1% | 87.5% | 59.4% |
| Black | 1.0% | 2.0% | 12.2% |
| Asian | 1.5% | 1.2% | 5.6% |
| Native American | 0.3% | 1.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 1.9% | 2.7% | 3.2% |
| Hispanic | 10.0% | 5.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Pleasant Prairie, WI | Sparta, WI | United States |
| Married Population | 56.7% | 45.4% | 49.8% |
| Currently Married | 55.7% | 42.5% | 48.0% |
| Married but Separated | 1.0% | 2.9% | 1.8% |
| Single Population | 43.3% | 54.6% | 50.2% |
| Never Married | 30.5% | 33.2% | 33.8% |
| Divorced | 8.2% | 16.4% | 10.8% |
| Widowed | 4.6% | 5.0% | 5.6% |
| space5 | | | |
| Household Size | 2.57 | 2.38 | 2.60 |
| Households | 8,178 | 4,084 | 124,010,992 |
| Family Households | 5,771 | 2,460 | 80,755,759 |
| Married couple, w/children | 29.1% | 25.2% | 30.5% |
| Married couple, no children | 55.1% | 39.9% | 42.9% |
| Non Family Households | 2,407 | 1,624 | 43,255,233 |
| Single householder, w/children | 11.9% | 22.9% | 15.8% |
| Single householder, no children | 3.9% | 12.0% | 10.8% |