| | Prospect, OR | Detroit, OR | United States |
| Population | 558 | 78 | 329,725,481 |
| Female Population | 46.8% | 47.4% | 50.5% |
| Male Population | 53.2% | 52.6% | 49.5% |
| Median Age | 58.7 | 63.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 422 | 203 | 309,327,143 |
| Population - 2000 | 327 | 262 | 285,036,114 |
| Population - 1990 | 305 | 331 | 251,960,433 |
| Pop. 2000 to Now | 60.2% | -13.7% | 15.6% |
| Pop. 1990 to Now | 71.8% | -31.7% | 30.8% |
| space4 | | | |
| Population Density | 159.4 | 132.7 | 93.4 |
| Land Area | 3.5 | 0.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Prospect, OR | Detroit, OR | United States |
| Age 0 to 4 | 3.9% | 0.0% | 5.9% |
| Age 5 to 9 | 4.8% | 0.0% | 6.1% |
| Age 10 to 14 | 6.1% | 0.0% | 6.6% |
| Age 15 to 17 | 1.1% | 0.0% | 3.9% |
| Age 18 to 20 | 0.7% | 2.6% | 4.0% |
| Age 21 to 24 | 0.0% | 0.0% | 5.2% |
| Age 25 to 34 | 8.4% | 2.6% | 13.8% |
| Age 35 to 44 | 10.0% | 0.0% | 12.9% |
| Age 45 to 54 | 10.2% | 20.5% | 12.6% |
| Age 55 to 59 | 5.2% | 14.1% | 6.7% |
| Age 60 to 64 | 9.0% | 16.7% | 6.3% |
| Age 65 to 74 | 19.5% | 38.5% | 9.6% |
| Age 75 to 84 | 20.4% | 5.1% | 4.5% |
| Age 85 and over | 0.5% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Prospect, OR | Detroit, OR | United States |
| White | 81.4% | 98.7% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.7% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 15.8% | 1.3% | 3.2% |
| Hispanic | 2.2% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Prospect, OR | Detroit, OR | United States |
| Married Population | 68.0% | 75.6% | 49.8% |
| Currently Married | 65.9% | 74.4% | 48.0% |
| Married but Separated | 2.1% | 1.3% | 1.8% |
| Single Population | 32.0% | 24.4% | 50.2% |
| Never Married | 16.0% | 9.0% | 33.8% |
| Divorced | 12.8% | 10.3% | 10.8% |
| Widowed | 3.2% | 5.1% | 5.6% |
| space5 | | | |
| Household Size | 2.37 | 1.66 | 2.60 |
| Households | 235 | 47 | 124,010,992 |
| Family Households | 164 | 29 | 80,755,759 |
| Married couple, w/children | 17.1% | 0.0% | 30.5% |
| Married couple, no children | 64.6% | 100.0% | 42.9% |
| Non Family Households | 71 | 18 | 43,255,233 |
| Single householder, w/children | 12.2% | 0.0% | 15.8% |
| Single householder, no children | 6.1% | 0.0% | 10.8% |