| | Plymouth, NC | Windsor, NC | United States |
| Population | 3,315 | 3,401 | 329,725,481 |
| Female Population | 38.2% | 39.6% | 50.5% |
| Male Population | 61.8% | 60.4% | 49.5% |
| Median Age | 47 | 42.3 | 38.4 |
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| Population - 2010 | 3,846 | 3,609 | 309,327,143 |
| Population - 2000 | 4,107 | 2,283 | 285,036,114 |
| Population - 1990 | 4,328 | 2,056 | 251,960,433 |
| Pop. 2000 to Now | -18.9% | 53.0% | 15.6% |
| Pop. 1990 to Now | -23.0% | 69.9% | 30.8% |
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| Population Density | 822.8 | 1,207.7 | 93.4 |
| Land Area | 4.0 | 2.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Plymouth, NC | Windsor, NC | United States |
| Age 0 to 4 | 0.5% | 3.1% | 5.9% |
| Age 5 to 9 | 1.3% | 4.2% | 6.1% |
| Age 10 to 14 | 10.2% | 1.9% | 6.6% |
| Age 15 to 17 | 7.6% | 3.0% | 3.9% |
| Age 18 to 20 | 9.0% | 3.6% | 4.0% |
| Age 21 to 24 | 0.0% | 4.1% | 5.2% |
| Age 25 to 34 | 7.2% | 18.8% | 13.8% |
| Age 35 to 44 | 8.8% | 16.3% | 12.9% |
| Age 45 to 54 | 13.9% | 9.2% | 12.6% |
| Age 55 to 59 | 7.0% | 5.3% | 6.7% |
| Age 60 to 64 | 12.5% | 7.2% | 6.3% |
| Age 65 to 74 | 13.4% | 12.6% | 9.6% |
| Age 75 to 84 | 5.2% | 6.8% | 4.5% |
| Age 85 and over | 3.4% | 3.9% | 1.9% |
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| Race | | | |
| | Plymouth, NC | Windsor, NC | United States |
| White | 28.4% | 29.1% | 59.4% |
| Black | 70.1% | 59.4% | 12.2% |
| Asian | 0.0% | 3.7% | 5.6% |
| Native American | 0.1% | 1.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.4% | 0.3% | 0.4% |
| Two or More Races | 0.0% | 3.6% | 3.2% |
| Hispanic | 0.1% | 2.3% | 18.4% |
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| Marriage & Family | | | |
| | Plymouth, NC | Windsor, NC | United States |
| Married Population | 25.8% | 31.5% | 49.8% |
| Currently Married | 18.3% | 26.7% | 48.0% |
| Married but Separated | 7.5% | 4.8% | 1.8% |
| Single Population | 74.2% | 68.5% | 50.2% |
| Never Married | 42.0% | 45.5% | 33.8% |
| Divorced | 18.7% | 15.0% | 10.8% |
| Widowed | 13.5% | 8.1% | 5.6% |
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| Household Size | 1.98 | 2.16 | 2.60 |
| Households | 1,615 | 995 | 124,010,992 |
| Family Households | 555 | 642 | 80,755,759 |
| Married couple, w/children | 3.1% | 11.2% | 30.5% |
| Married couple, no children | 36.9% | 49.2% | 42.9% |
| Non Family Households | 1,060 | 353 | 43,255,233 |
| Single householder, w/children | 44.1% | 27.7% | 15.8% |
| Single householder, no children | 15.9% | 11.8% | 10.8% |