| | Prospect, ME | Gouldsboro, ME | United States |
| Population | 795 | 1,680 | 329,725,481 |
| Female Population | 54.2% | 53.3% | 50.5% |
| Male Population | 45.8% | 46.7% | 49.5% |
| Median Age | 43.7 | 58.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 707 | 1,737 | 309,327,143 |
| Population - 2000 | 642 | 1,941 | 285,036,114 |
| Population - 1990 | 542 | 1,986 | 251,960,433 |
| Pop. 2000 to Now | 16.8% | -10.2% | 15.6% |
| Pop. 1990 to Now | 38.4% | -12.2% | 30.8% |
| space4 | | | |
| Population Density | 44.0 | 36.3 | 93.4 |
| Land Area | 18.1 | 46.2 | 3,531,905.4 |
| Water Area | 2.1 | 52.8 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Prospect, ME | Gouldsboro, ME | United States |
| Age 0 to 4 | 1.8% | 2.3% | 5.9% |
| Age 5 to 9 | 1.4% | 2.3% | 6.1% |
| Age 10 to 14 | 16.9% | 6.2% | 6.6% |
| Age 15 to 17 | 1.0% | 4.2% | 3.9% |
| Age 18 to 20 | 1.1% | 3.7% | 4.0% |
| Age 21 to 24 | 10.6% | 0.5% | 5.2% |
| Age 25 to 34 | 7.0% | 7.5% | 13.8% |
| Age 35 to 44 | 10.8% | 8.6% | 12.9% |
| Age 45 to 54 | 15.6% | 10.6% | 12.6% |
| Age 55 to 59 | 9.9% | 6.9% | 6.7% |
| Age 60 to 64 | 6.8% | 9.0% | 6.3% |
| Age 65 to 74 | 11.4% | 22.9% | 9.6% |
| Age 75 to 84 | 5.2% | 6.5% | 4.5% |
| Age 85 and over | 0.5% | 8.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Prospect, ME | Gouldsboro, ME | United States |
| White | 95.3% | 98.2% | 59.4% |
| Black | 0.3% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.3% | 1.3% | 3.2% |
| Hispanic | 1.1% | 0.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Prospect, ME | Gouldsboro, ME | United States |
| Married Population | 46.1% | 66.4% | 49.8% |
| Currently Married | 43.9% | 66.4% | 48.0% |
| Married but Separated | 2.2% | 0.0% | 1.8% |
| Single Population | 53.9% | 33.6% | 50.2% |
| Never Married | 27.7% | 18.6% | 33.8% |
| Divorced | 21.9% | 7.0% | 10.8% |
| Widowed | 4.4% | 8.0% | 5.6% |
| space5 | | | |
| Household Size | 2.16 | 2.20 | 2.60 |
| Households | 368 | 765 | 124,010,992 |
| Family Households | 188 | 547 | 80,755,759 |
| Married couple, w/children | 10.6% | 17.4% | 30.5% |
| Married couple, no children | 60.1% | 70.9% | 42.9% |
| Non Family Households | 180 | 218 | 43,255,233 |
| Single householder, w/children | 26.1% | 10.2% | 15.8% |
| Single householder, no children | 3.2% | 1.5% | 10.8% |