| | Wolcott, CT | Plymouth, CT | United States |
| Population | 16,232 | 11,705 | 329,725,481 |
| Female Population | 50.1% | 53.2% | 50.5% |
| Male Population | 49.9% | 46.8% | 49.5% |
| Median Age | 45.5 | 45.5 | 38.4 |
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| Population - 2010 | 16,714 | 12,234 | 309,327,143 |
| Population - 2000 | 15,215 | 11,634 | 285,036,114 |
| Population - 1990 | 13,700 | 11,822 | 251,960,433 |
| Pop. 2000 to Now | 8.9% | -0.7% | 15.6% |
| Pop. 1990 to Now | 20.9% | -2.3% | 30.8% |
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| Population Density | 794.3 | 535.3 | 93.4 |
| Land Area | 20.4 | 21.9 | 3,531,905.4 |
| Water Area | 0.7 | 0.5 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Wolcott, CT | Plymouth, CT | United States |
| Age 0 to 4 | 5.5% | 3.6% | 5.9% |
| Age 5 to 9 | 5.0% | 5.3% | 6.1% |
| Age 10 to 14 | 6.4% | 4.1% | 6.6% |
| Age 15 to 17 | 3.6% | 4.0% | 3.9% |
| Age 18 to 20 | 3.0% | 2.8% | 4.0% |
| Age 21 to 24 | 4.6% | 7.3% | 5.2% |
| Age 25 to 34 | 10.3% | 9.9% | 13.8% |
| Age 35 to 44 | 10.3% | 12.2% | 12.9% |
| Age 45 to 54 | 17.3% | 17.2% | 12.6% |
| Age 55 to 59 | 6.9% | 8.6% | 6.7% |
| Age 60 to 64 | 6.5% | 9.3% | 6.3% |
| Age 65 to 74 | 11.7% | 10.4% | 9.6% |
| Age 75 to 84 | 4.6% | 3.7% | 4.5% |
| Age 85 and over | 4.1% | 1.8% | 1.9% |
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| Race | | | |
| | Wolcott, CT | Plymouth, CT | United States |
| White | 86.2% | 85.9% | 59.4% |
| Black | 2.0% | 1.0% | 12.2% |
| Asian | 1.8% | 0.2% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 2.1% | 5.1% | 3.2% |
| Hispanic | 7.8% | 7.5% | 18.4% |
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| Marriage & Family | | | |
| | Wolcott, CT | Plymouth, CT | United States |
| Married Population | 54.3% | 48.6% | 49.8% |
| Currently Married | 54.2% | 47.4% | 48.0% |
| Married but Separated | 0.1% | 1.2% | 1.8% |
| Single Population | 45.7% | 51.4% | 50.2% |
| Never Married | 26.6% | 33.3% | 33.8% |
| Divorced | 12.8% | 11.0% | 10.8% |
| Widowed | 6.3% | 7.1% | 5.6% |
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| Household Size | 2.57 | 2.45 | 2.60 |
| Households | 6,250 | 4,734 | 124,010,992 |
| Family Households | 4,345 | 2,962 | 80,755,759 |
| Married couple, w/children | 33.9% | 20.6% | 30.5% |
| Married couple, no children | 47.2% | 57.8% | 42.9% |
| Non Family Households | 1,905 | 1,772 | 43,255,233 |
| Single householder, w/children | 6.9% | 11.6% | 15.8% |
| Single householder, no children | 12.0% | 10.1% | 10.8% |