| | Waldoboro, ME | Sanford, ME | United States |
| Population | 5,135 | 21,812 | 329,725,481 |
| Female Population | 54.5% | 52.8% | 50.5% |
| Male Population | 45.5% | 47.2% | 49.5% |
| Median Age | 55.8 | 39.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,065 | 20,786 | 309,327,143 |
| Population - 2000 | 4,916 | 20,806 | 285,036,114 |
| Population - 1990 | 4,601 | 20,463 | 251,960,433 |
| Pop. 2000 to Now | 3.3% | 2.2% | 15.6% |
| Pop. 1990 to Now | 10.4% | 3.9% | 30.8% |
| space4 | | | |
| Population Density | 71.8 | 456.5 | 93.4 |
| Land Area | 71.5 | 47.8 | 3,531,905.4 |
| Water Area | 7.4 | 1.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Waldoboro, ME | Sanford, ME | United States |
| Age 0 to 4 | 3.8% | 5.3% | 5.9% |
| Age 5 to 9 | 5.8% | 7.9% | 6.1% |
| Age 10 to 14 | 2.6% | 5.1% | 6.6% |
| Age 15 to 17 | 3.1% | 4.6% | 3.9% |
| Age 18 to 20 | 2.6% | 2.1% | 4.0% |
| Age 21 to 24 | 0.8% | 3.2% | 5.2% |
| Age 25 to 34 | 9.4% | 14.9% | 13.8% |
| Age 35 to 44 | 8.0% | 12.0% | 12.9% |
| Age 45 to 54 | 12.7% | 12.4% | 12.6% |
| Age 55 to 59 | 9.5% | 7.6% | 6.7% |
| Age 60 to 64 | 13.7% | 6.8% | 6.3% |
| Age 65 to 74 | 14.9% | 11.4% | 9.6% |
| Age 75 to 84 | 8.8% | 5.1% | 4.5% |
| Age 85 and over | 4.3% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Waldoboro, ME | Sanford, ME | United States |
| White | 96.5% | 92.0% | 59.4% |
| Black | 0.0% | 1.7% | 12.2% |
| Asian | 0.0% | 1.8% | 5.6% |
| Native American | 0.7% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.8% | 2.4% | 3.2% |
| Hispanic | 1.0% | 2.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Waldoboro, ME | Sanford, ME | United States |
| Married Population | 42.3% | 47.8% | 49.8% |
| Currently Married | 42.3% | 45.5% | 48.0% |
| Married but Separated | 0.0% | 2.3% | 1.8% |
| Single Population | 57.7% | 52.2% | 50.2% |
| Never Married | 28.3% | 29.4% | 33.8% |
| Divorced | 15.8% | 16.6% | 10.8% |
| Widowed | 13.6% | 6.1% | 5.6% |
| space5 | | | |
| Household Size | 1.94 | 2.38 | 2.60 |
| Households | 2,639 | 9,034 | 124,010,992 |
| Family Households | 1,208 | 5,307 | 80,755,759 |
| Married couple, w/children | 22.4% | 28.9% | 30.5% |
| Married couple, no children | 49.3% | 44.0% | 42.9% |
| Non Family Households | 1,431 | 3,727 | 43,255,233 |
| Single householder, w/children | 15.6% | 19.8% | 15.8% |
| Single householder, no children | 12.7% | 7.2% | 10.8% |