| | Painted Post, NY | Erin, NY | United States |
| Population | 1,631 | 1,904 | 329,725,481 |
| Female Population | 54.0% | 47.0% | 50.5% |
| Male Population | 46.1% | 53.1% | 49.5% |
| Median Age | 43.8 | 44.3 | 38.4 |
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| Population - 2010 | 1,809 | 1,960 | 309,327,143 |
| Population - 2000 | 1,842 | 2,054 | 285,036,114 |
| Population - 1990 | 1,950 | 2,002 | 251,960,433 |
| Pop. 2000 to Now | 3.5% | -10.9% | 15.6% |
| Pop. 1990 to Now | -2.3% | -8.5% | 30.8% |
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| Population Density | 1,280.2 | 43.0 | 93.4 |
| Land Area | 1.3 | 44.2 | 3,531,905.4 |
| Water Area | 0.1 | 0.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Painted Post, NY | Erin, NY | United States |
| Age 0 to 4 | 4.6% | 3.3% | 5.9% |
| Age 5 to 9 | 5.2% | 6.6% | 6.1% |
| Age 10 to 14 | 5.9% | 6.8% | 6.6% |
| Age 15 to 17 | 3.9% | 6.5% | 3.9% |
| Age 18 to 20 | 4.6% | 3.7% | 4.0% |
| Age 21 to 24 | 3.9% | 7.1% | 5.2% |
| Age 25 to 34 | 11.7% | 8.0% | 13.8% |
| Age 35 to 44 | 11.6% | 9.4% | 12.9% |
| Age 45 to 54 | 13.2% | 14.1% | 12.6% |
| Age 55 to 59 | 7.6% | 9.1% | 6.7% |
| Age 60 to 64 | 8.4% | 6.8% | 6.3% |
| Age 65 to 74 | 13.7% | 13.1% | 9.6% |
| Age 75 to 84 | 2.5% | 4.9% | 4.5% |
| Age 85 and over | 3.1% | 0.6% | 1.9% |
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| Race | | | |
| | Painted Post, NY | Erin, NY | United States |
| White | 91.0% | 95.6% | 59.4% |
| Black | 1.3% | 0.5% | 12.2% |
| Asian | 3.2% | 0.3% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.5% | 0.0% | 0.4% |
| Two or More Races | 3.0% | 2.7% | 3.2% |
| Hispanic | 0.0% | 0.7% | 18.4% |
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| Marriage & Family | | | |
| | Painted Post, NY | Erin, NY | United States |
| Married Population | 48.1% | 49.3% | 49.8% |
| Currently Married | 43.8% | 47.9% | 48.0% |
| Married but Separated | 4.4% | 1.4% | 1.8% |
| Single Population | 51.9% | 50.7% | 50.2% |
| Never Married | 29.7% | 32.2% | 33.8% |
| Divorced | 14.8% | 13.5% | 10.8% |
| Widowed | 7.3% | 4.9% | 5.6% |
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| Household Size | 2.07 | 2.53 | 2.60 |
| Households | 785 | 752 | 124,010,992 |
| Family Households | 464 | 490 | 80,755,759 |
| Married couple, w/children | 19.0% | 20.8% | 30.5% |
| Married couple, no children | 45.9% | 52.4% | 42.9% |
| Non Family Households | 321 | 262 | 43,255,233 |
| Single householder, w/children | 22.8% | 17.8% | 15.8% |
| Single householder, no children | 12.3% | 9.0% | 10.8% |