| | Benton City, WA | Prosser, WA | United States |
| Population | 3,435 | 6,061 | 329,725,481 |
| Female Population | 51.2% | 54.7% | 50.5% |
| Male Population | 48.8% | 45.3% | 49.5% |
| Median Age | 27.8 | 33.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,055 | 5,782 | 309,327,143 |
| Population - 2000 | 2,624 | 4,838 | 285,036,114 |
| Population - 1990 | 1,806 | 4,476 | 251,960,433 |
| Pop. 2000 to Now | 32.5% | 32.2% | 15.6% |
| Pop. 1990 to Now | 92.5% | 42.9% | 30.8% |
| space4 | | | |
| Population Density | 1,410.1 | 1,326.3 | 93.4 |
| Land Area | 2.4 | 4.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Benton City, WA | Prosser, WA | United States |
| Age 0 to 4 | 16.3% | 4.1% | 5.9% |
| Age 5 to 9 | 10.0% | 11.0% | 6.1% |
| Age 10 to 14 | 5.5% | 11.3% | 6.6% |
| Age 15 to 17 | 2.1% | 3.2% | 3.9% |
| Age 18 to 20 | 2.5% | 1.0% | 4.0% |
| Age 21 to 24 | 6.3% | 8.0% | 5.2% |
| Age 25 to 34 | 20.6% | 15.3% | 13.8% |
| Age 35 to 44 | 8.9% | 7.7% | 12.9% |
| Age 45 to 54 | 7.9% | 12.8% | 12.6% |
| Age 55 to 59 | 3.9% | 4.5% | 6.7% |
| Age 60 to 64 | 4.6% | 5.6% | 6.3% |
| Age 65 to 74 | 8.7% | 7.6% | 9.6% |
| Age 75 to 84 | 2.5% | 4.9% | 4.5% |
| Age 85 and over | 0.3% | 3.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Benton City, WA | Prosser, WA | United States |
| White | 55.3% | 41.7% | 59.4% |
| Black | 0.0% | 0.8% | 12.2% |
| Asian | 0.2% | 2.1% | 5.6% |
| Native American | 1.5% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.5% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.6% | 0.0% | 3.2% |
| Hispanic | 42.3% | 55.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Benton City, WA | Prosser, WA | United States |
| Married Population | 53.3% | 47.7% | 49.8% |
| Currently Married | 48.9% | 45.2% | 48.0% |
| Married but Separated | 4.4% | 2.5% | 1.8% |
| Single Population | 46.7% | 52.3% | 50.2% |
| Never Married | 31.3% | 32.3% | 33.8% |
| Divorced | 9.6% | 12.5% | 10.8% |
| Widowed | 5.8% | 7.6% | 5.6% |
| space5 | | | |
| Household Size | 3.05 | 2.67 | 2.60 |
| Households | 1,126 | 2,272 | 124,010,992 |
| Family Households | 805 | 1,575 | 80,755,759 |
| Married couple, w/children | 34.4% | 23.0% | 30.5% |
| Married couple, no children | 35.5% | 41.1% | 42.9% |
| Non Family Households | 321 | 697 | 43,255,233 |
| Single householder, w/children | 27.1% | 29.3% | 15.8% |
| Single householder, no children | 3.0% | 6.5% | 10.8% |