| | Casco, ME | Poland, ME | United States |
| Population | 3,643 | 5,880 | 329,725,481 |
| Female Population | 49.7% | 49.5% | 50.5% |
| Male Population | 50.3% | 50.5% | 49.5% |
| Median Age | 48.6 | 41.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,744 | 5,386 | 309,327,143 |
| Population - 2000 | 3,469 | 4,866 | 285,036,114 |
| Population - 1990 | 3,018 | 4,342 | 251,960,433 |
| Pop. 2000 to Now | 13.6% | 16.8% | 15.6% |
| Pop. 1990 to Now | 30.6% | 30.9% | 30.8% |
| space4 | | | |
| Population Density | 116.5 | 139.2 | 93.4 |
| Land Area | 31.3 | 42.2 | 3,531,905.4 |
| Water Area | 6.7 | 5.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Casco, ME | Poland, ME | United States |
| Age 0 to 4 | 3.8% | 10.9% | 5.9% |
| Age 5 to 9 | 5.1% | 4.3% | 6.1% |
| Age 10 to 14 | 3.4% | 4.5% | 6.6% |
| Age 15 to 17 | 2.1% | 1.7% | 3.9% |
| Age 18 to 20 | 1.7% | 4.5% | 4.0% |
| Age 21 to 24 | 8.5% | 1.7% | 5.2% |
| Age 25 to 34 | 13.3% | 16.6% | 13.8% |
| Age 35 to 44 | 7.7% | 8.1% | 12.9% |
| Age 45 to 54 | 19.0% | 13.2% | 12.6% |
| Age 55 to 59 | 8.2% | 10.7% | 6.7% |
| Age 60 to 64 | 6.3% | 8.9% | 6.3% |
| Age 65 to 74 | 10.0% | 11.0% | 9.6% |
| Age 75 to 84 | 8.2% | 2.8% | 4.5% |
| Age 85 and over | 2.6% | 1.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Casco, ME | Poland, ME | United States |
| White | 89.2% | 99.0% | 59.4% |
| Black | 0.3% | 0.0% | 12.2% |
| Asian | 0.5% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.5% | 0.4% |
| Two or More Races | 9.9% | 0.5% | 3.2% |
| Hispanic | 0.2% | 0.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Casco, ME | Poland, ME | United States |
| Married Population | 43.7% | 49.3% | 49.8% |
| Currently Married | 42.8% | 48.3% | 48.0% |
| Married but Separated | 1.0% | 1.0% | 1.8% |
| Single Population | 56.3% | 50.7% | 50.2% |
| Never Married | 36.2% | 25.2% | 33.8% |
| Divorced | 11.4% | 21.6% | 10.8% |
| Widowed | 8.7% | 4.0% | 5.6% |
| space5 | | | |
| Household Size | 2.13 | 2.50 | 2.60 |
| Households | 1,700 | 2,348 | 124,010,992 |
| Family Households | 844 | 1,411 | 80,755,759 |
| Married couple, w/children | 23.2% | 37.0% | 30.5% |
| Married couple, no children | 53.7% | 42.7% | 42.9% |
| Non Family Households | 856 | 937 | 43,255,233 |
| Single householder, w/children | 8.8% | 10.3% | 15.8% |
| Single householder, no children | 14.3% | 10.1% | 10.8% |