| | Erwin, NY | Southport, NY | United States |
| Population | 8,061 | 9,786 | 329,725,481 |
| Female Population | 52.5% | 47.9% | 50.5% |
| Male Population | 47.5% | 52.1% | 49.5% |
| Median Age | 41.3 | 45.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 8,072 | 10,928 | 309,327,143 |
| Population - 2000 | 7,227 | 11,185 | 285,036,114 |
| Population - 1990 | 6,763 | 11,571 | 251,960,433 |
| Pop. 2000 to Now | 11.7% | -14.0% | 15.6% |
| Pop. 1990 to Now | 19.4% | -16.8% | 30.8% |
| space4 | | | |
| Population Density | 208.5 | 210.9 | 93.4 |
| Land Area | 38.7 | 46.4 | 3,531,905.4 |
| Water Area | 0.5 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Erwin, NY | Southport, NY | United States |
| Age 0 to 4 | 5.9% | 6.1% | 5.9% |
| Age 5 to 9 | 6.1% | 4.3% | 6.1% |
| Age 10 to 14 | 6.9% | 4.5% | 6.6% |
| Age 15 to 17 | 5.5% | 1.7% | 3.9% |
| Age 18 to 20 | 3.8% | 1.6% | 4.0% |
| Age 21 to 24 | 3.0% | 4.8% | 5.2% |
| Age 25 to 34 | 10.4% | 14.8% | 13.8% |
| Age 35 to 44 | 13.0% | 12.1% | 12.9% |
| Age 45 to 54 | 15.3% | 10.3% | 12.6% |
| Age 55 to 59 | 9.5% | 7.7% | 6.7% |
| Age 60 to 64 | 4.1% | 9.7% | 6.3% |
| Age 65 to 74 | 9.6% | 12.4% | 9.6% |
| Age 75 to 84 | 4.7% | 6.3% | 4.5% |
| Age 85 and over | 2.1% | 3.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Erwin, NY | Southport, NY | United States |
| White | 82.8% | 90.5% | 59.4% |
| Black | 4.2% | 6.1% | 12.2% |
| Asian | 7.7% | 0.0% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 2.7% | 1.0% | 3.2% |
| Hispanic | 2.3% | 2.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Erwin, NY | Southport, NY | United States |
| Married Population | 58.2% | 47.3% | 49.8% |
| Currently Married | 56.8% | 41.9% | 48.0% |
| Married but Separated | 1.4% | 5.5% | 1.8% |
| Single Population | 41.8% | 52.7% | 50.2% |
| Never Married | 25.4% | 30.6% | 33.8% |
| Divorced | 10.3% | 13.5% | 10.8% |
| Widowed | 6.2% | 8.5% | 5.6% |
| space5 | | | |
| Household Size | 2.49 | 2.20 | 2.60 |
| Households | 3,193 | 4,258 | 124,010,992 |
| Family Households | 2,252 | 2,432 | 80,755,759 |
| Married couple, w/children | 42.3% | 18.6% | 30.5% |
| Married couple, no children | 37.1% | 47.9% | 42.9% |
| Non Family Households | 941 | 1,826 | 43,255,233 |
| Single householder, w/children | 11.4% | 21.1% | 15.8% |
| Single householder, no children | 9.3% | 12.3% | 10.8% |