| | Auburn, MA | Wells, ME | United States |
| Population | 16,826 | 11,156 | 329,725,481 |
| Female Population | 52.7% | 51.4% | 50.5% |
| Male Population | 47.3% | 48.6% | 49.5% |
| Median Age | 43.1 | 50.1 | 38.4 |
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| Population - 2010 | 16,234 | 9,592 | 309,327,143 |
| Population - 2000 | 15,901 | 9,400 | 285,036,114 |
| Population - 1990 | 15,005 | 7,778 | 251,960,433 |
| Pop. 2000 to Now | 5.0% | 15.1% | 15.6% |
| Pop. 1990 to Now | 11.3% | 39.1% | 30.8% |
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| Population Density | 1,086.8 | 193.8 | 93.4 |
| Land Area | 15.5 | 57.6 | 3,531,905.4 |
| Water Area | 0.9 | 16.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Auburn, MA | Wells, ME | United States |
| Age 0 to 4 | 4.1% | 6.7% | 5.9% |
| Age 5 to 9 | 7.1% | 4.8% | 6.1% |
| Age 10 to 14 | 6.9% | 4.3% | 6.6% |
| Age 15 to 17 | 4.0% | 3.4% | 3.9% |
| Age 18 to 20 | 2.4% | 2.3% | 4.0% |
| Age 21 to 24 | 2.9% | 3.4% | 5.2% |
| Age 25 to 34 | 11.5% | 9.7% | 13.8% |
| Age 35 to 44 | 13.1% | 9.4% | 12.9% |
| Age 45 to 54 | 14.5% | 13.8% | 12.6% |
| Age 55 to 59 | 7.1% | 8.4% | 6.7% |
| Age 60 to 64 | 6.6% | 7.8% | 6.3% |
| Age 65 to 74 | 10.5% | 14.3% | 9.6% |
| Age 75 to 84 | 6.1% | 9.4% | 4.5% |
| Age 85 and over | 3.2% | 2.4% | 1.9% |
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| Race | | | |
| | Auburn, MA | Wells, ME | United States |
| White | 90.7% | 91.4% | 59.4% |
| Black | 0.4% | 2.5% | 12.2% |
| Asian | 2.8% | 1.6% | 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 | 1.2% | 2.3% | 3.2% |
| Hispanic | 5.0% | 2.2% | 18.4% |
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| Marriage & Family | | | |
| | Auburn, MA | Wells, ME | United States |
| Married Population | 48.5% | 57.7% | 49.8% |
| Currently Married | 47.5% | 56.8% | 48.0% |
| Married but Separated | 1.0% | 0.9% | 1.8% |
| Single Population | 51.5% | 42.3% | 50.2% |
| Never Married | 29.9% | 21.4% | 33.8% |
| Divorced | 12.9% | 12.0% | 10.8% |
| Widowed | 8.7% | 8.8% | 5.6% |
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| Household Size | 2.53 | 2.27 | 2.60 |
| Households | 6,595 | 4,904 | 124,010,992 |
| Family Households | 4,259 | 3,372 | 80,755,759 |
| Married couple, w/children | 30.1% | 24.1% | 30.5% |
| Married couple, no children | 41.3% | 54.8% | 42.9% |
| Non Family Households | 2,336 | 1,532 | 43,255,233 |
| Single householder, w/children | 15.3% | 10.4% | 15.8% |
| Single householder, no children | 13.2% | 10.8% | 10.8% |