| | Clarence, NY | Islesboro, ME | United States |
| Population | 32,727 | 600 | 329,725,481 |
| Female Population | 49.4% | 48.0% | 50.5% |
| Male Population | 50.6% | 52.0% | 49.5% |
| Median Age | 46.6 | 62.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 30,673 | 567 | 309,327,143 |
| Population - 2000 | 26,123 | 603 | 285,036,114 |
| Population - 1990 | 20,041 | 579 | 251,960,433 |
| Pop. 2000 to Now | 26.4% | -6.8% | 15.6% |
| Pop. 1990 to Now | 64.8% | -2.9% | 30.8% |
| space4 | | | |
| Population Density | 611.7 | 42.0 | 93.4 |
| Land Area | 53.5 | 14.3 | 3,531,905.4 |
| Water Area | 0.1 | 54.6 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Clarence, NY | Islesboro, ME | United States |
| Age 0 to 4 | 5.8% | 2.2% | 5.9% |
| Age 5 to 9 | 6.0% | 2.7% | 6.1% |
| Age 10 to 14 | 6.7% | 7.8% | 6.6% |
| Age 15 to 17 | 4.2% | 1.7% | 3.9% |
| Age 18 to 20 | 2.2% | 2.0% | 4.0% |
| Age 21 to 24 | 4.1% | 0.8% | 5.2% |
| Age 25 to 34 | 8.2% | 9.2% | 13.8% |
| Age 35 to 44 | 10.9% | 7.8% | 12.9% |
| Age 45 to 54 | 16.3% | 9.7% | 12.6% |
| Age 55 to 59 | 9.0% | 4.3% | 6.7% |
| Age 60 to 64 | 6.4% | 6.8% | 6.3% |
| Age 65 to 74 | 10.4% | 31.7% | 9.6% |
| Age 75 to 84 | 6.1% | 9.8% | 4.5% |
| Age 85 and over | 3.5% | 3.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Clarence, NY | Islesboro, ME | United States |
| White | 93.1% | 99.7% | 59.4% |
| Black | 0.4% | 0.3% | 12.2% |
| Asian | 1.7% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.0% | 0.4% |
| Two or More Races | 2.1% | 0.0% | 3.2% |
| Hispanic | 2.0% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Clarence, NY | Islesboro, ME | United States |
| Married Population | 60.6% | 52.1% | 49.8% |
| Currently Married | 59.3% | 51.5% | 48.0% |
| Married but Separated | 1.3% | 0.6% | 1.8% |
| Single Population | 39.4% | 47.9% | 50.2% |
| Never Married | 24.7% | 25.8% | 33.8% |
| Divorced | 8.2% | 17.4% | 10.8% |
| Widowed | 6.5% | 4.8% | 5.6% |
| space5 | | | |
| Household Size | 2.57 | 1.78 | 2.60 |
| Households | 12,605 | 329 | 124,010,992 |
| Family Households | 9,087 | 177 | 80,755,759 |
| Married couple, w/children | 36.7% | 28.8% | 30.5% |
| Married couple, no children | 49.6% | 52.5% | 42.9% |
| Non Family Households | 3,518 | 152 | 43,255,233 |
| Single householder, w/children | 5.9% | 15.3% | 15.8% |
| Single householder, no children | 7.9% | 3.4% | 10.8% |