| | Sanford, ME | Greeneville, TN | United States |
| Population | 21,812 | 15,361 | 329,725,481 |
| Female Population | 52.8% | 53.4% | 50.5% |
| Male Population | 47.2% | 46.7% | 49.5% |
| Median Age | 39.7 | 41.9 | 38.4 |
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| Population - 2010 | 20,786 | 15,038 | 309,327,143 |
| Population - 2000 | 20,806 | 15,198 | 285,036,114 |
| Population - 1990 | 20,463 | 13,532 | 251,960,433 |
| Pop. 2000 to Now | 2.2% | -1.7% | 15.6% |
| Pop. 1990 to Now | 3.9% | 10.4% | 30.8% |
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| Population Density | 456.5 | 903.8 | 93.4 |
| Land Area | 47.8 | 17.0 | 3,531,905.4 |
| Water Area | 1.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Sanford, ME | Greeneville, TN | United States |
| Age 0 to 4 | 5.3% | 5.2% | 5.9% |
| Age 5 to 9 | 7.9% | 3.7% | 6.1% |
| Age 10 to 14 | 5.1% | 8.6% | 6.6% |
| Age 15 to 17 | 4.6% | 3.9% | 3.9% |
| Age 18 to 20 | 2.1% | 3.8% | 4.0% |
| Age 21 to 24 | 3.2% | 2.9% | 5.2% |
| Age 25 to 34 | 14.9% | 13.1% | 13.8% |
| Age 35 to 44 | 12.0% | 12.0% | 12.9% |
| Age 45 to 54 | 12.4% | 12.9% | 12.6% |
| Age 55 to 59 | 7.6% | 4.9% | 6.7% |
| Age 60 to 64 | 6.8% | 8.1% | 6.3% |
| Age 65 to 74 | 11.4% | 12.0% | 9.6% |
| Age 75 to 84 | 5.1% | 6.7% | 4.5% |
| Age 85 and over | 1.7% | 2.1% | 1.9% |
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| Race | | | |
| | Sanford, ME | Greeneville, TN | United States |
| White | 92.0% | 85.5% | 59.4% |
| Black | 1.7% | 2.1% | 12.2% |
| Asian | 1.8% | 0.7% | 5.6% |
| Native American | 0.1% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.4% | 5.0% | 3.2% |
| Hispanic | 2.0% | 6.5% | 18.4% |
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| Marriage & Family | | | |
| | Sanford, ME | Greeneville, TN | United States |
| Married Population | 47.8% | 41.3% | 49.8% |
| Currently Married | 45.5% | 39.2% | 48.0% |
| Married but Separated | 2.3% | 2.1% | 1.8% |
| Single Population | 52.2% | 58.7% | 50.2% |
| Never Married | 29.4% | 30.0% | 33.8% |
| Divorced | 16.6% | 19.6% | 10.8% |
| Widowed | 6.1% | 9.2% | 5.6% |
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| Household Size | 2.38 | 2.52 | 2.60 |
| Households | 9,034 | 5,752 | 124,010,992 |
| Family Households | 5,307 | 3,451 | 80,755,759 |
| Married couple, w/children | 28.9% | 24.4% | 30.5% |
| Married couple, no children | 44.0% | 40.2% | 42.9% |
| Non Family Households | 3,727 | 2,301 | 43,255,233 |
| Single householder, w/children | 19.8% | 20.3% | 15.8% |
| Single householder, no children | 7.2% | 15.1% | 10.8% |