| | Gates, NY | Sullivan, ME | United States |
| Population | 29,125 | 1,431 | 329,725,481 |
| Female Population | 50.9% | 50.7% | 50.5% |
| Male Population | 49.1% | 49.3% | 49.5% |
| Median Age | 44.2 | 41.9 | 38.4 |
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| Population - 2010 | 28,510 | 1,237 | 309,327,143 |
| Population - 2000 | 29,275 | 1,185 | 285,036,114 |
| Population - 1990 | 28,583 | 1,118 | 251,960,433 |
| Pop. 2000 to Now | -3.5% | 6.4% | 15.6% |
| Pop. 1990 to Now | -1.1% | 12.8% | 30.8% |
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| Population Density | 1,916.2 | 53.7 | 93.4 |
| Land Area | 15.2 | 26.7 | 3,531,905.4 |
| Water Area | 0.1 | 3.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Gates, NY | Sullivan, ME | United States |
| Age 0 to 4 | 4.9% | 9.4% | 5.9% |
| Age 5 to 9 | 5.9% | 4.1% | 6.1% |
| Age 10 to 14 | 4.3% | 4.8% | 6.6% |
| Age 15 to 17 | 2.2% | 3.7% | 3.9% |
| Age 18 to 20 | 1.9% | 2.0% | 4.0% |
| Age 21 to 24 | 4.0% | 3.8% | 5.2% |
| Age 25 to 34 | 16.0% | 17.1% | 13.8% |
| Age 35 to 44 | 11.9% | 6.6% | 12.9% |
| Age 45 to 54 | 11.7% | 10.8% | 12.6% |
| Age 55 to 59 | 8.1% | 9.1% | 6.7% |
| Age 60 to 64 | 8.0% | 10.1% | 6.3% |
| Age 65 to 74 | 12.9% | 13.4% | 9.6% |
| Age 75 to 84 | 6.4% | 3.5% | 4.5% |
| Age 85 and over | 1.8% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Gates, NY | Sullivan, ME | United States |
| White | 77.6% | 94.6% | 59.4% |
| Black | 11.9% | 0.0% | 12.2% |
| Asian | 2.6% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 1.8% | 3.6% | 3.2% |
| Hispanic | 5.8% | 1.7% | 18.4% |
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| Marriage & Family | | | |
| | Gates, NY | Sullivan, ME | United States |
| Married Population | 52.2% | 44.7% | 49.8% |
| Currently Married | 50.3% | 40.1% | 48.0% |
| Married but Separated | 1.8% | 4.5% | 1.8% |
| Single Population | 47.8% | 55.3% | 50.2% |
| Never Married | 30.0% | 25.7% | 33.8% |
| Divorced | 11.1% | 21.7% | 10.8% |
| Widowed | 6.7% | 7.9% | 5.6% |
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| Household Size | 2.36 | 2.97 | 2.60 |
| Households | 12,262 | 482 | 124,010,992 |
| Family Households | 7,973 | 346 | 80,755,759 |
| Married couple, w/children | 23.1% | 20.5% | 30.5% |
| Married couple, no children | 50.4% | 41.6% | 42.9% |
| Non Family Households | 4,289 | 136 | 43,255,233 |
| Single householder, w/children | 13.2% | 23.1% | 15.8% |
| Single householder, no children | 13.3% | 14.7% | 10.8% |