| | East Moriches, NY | Patchogue, NY | United States |
| Population | 5,124 | 12,341 | 329,725,481 |
| Female Population | 45.9% | 52.2% | 50.5% |
| Male Population | 54.1% | 47.8% | 49.5% |
| Median Age | 47.7 | 37.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,880 | 11,848 | 309,327,143 |
| Population - 2000 | 4,550 | 11,919 | 285,036,114 |
| Population - 1990 | 4,021 | 11,060 | 251,960,433 |
| Pop. 2000 to Now | 12.4% | 3.3% | 15.6% |
| Pop. 1990 to Now | 27.2% | 11.3% | 30.8% |
| space4 | | | |
| Population Density | 931.8 | 5,460.6 | 93.4 |
| Land Area | 5.5 | 2.3 | 3,531,905.4 |
| Water Area | 0.1 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | East Moriches, NY | Patchogue, NY | United States |
| Age 0 to 4 | 3.7% | 7.1% | 5.9% |
| Age 5 to 9 | 5.9% | 4.3% | 6.1% |
| Age 10 to 14 | 8.0% | 3.8% | 6.6% |
| Age 15 to 17 | 3.5% | 2.6% | 3.9% |
| Age 18 to 20 | 3.9% | 3.1% | 4.0% |
| Age 21 to 24 | 3.4% | 2.5% | 5.2% |
| Age 25 to 34 | 6.7% | 21.6% | 13.8% |
| Age 35 to 44 | 11.5% | 18.7% | 12.9% |
| Age 45 to 54 | 14.5% | 13.7% | 12.6% |
| Age 55 to 59 | 7.3% | 6.4% | 6.7% |
| Age 60 to 64 | 9.0% | 6.3% | 6.3% |
| Age 65 to 74 | 14.0% | 5.9% | 9.6% |
| Age 75 to 84 | 6.0% | 2.7% | 4.5% |
| Age 85 and over | 2.3% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | East Moriches, NY | Patchogue, NY | United States |
| White | 92.4% | 65.2% | 59.4% |
| Black | 0.9% | 3.8% | 12.2% |
| Asian | 2.0% | 6.0% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.7% | 0.3% | 0.4% |
| Two or More Races | 2.9% | 5.3% | 3.2% |
| Hispanic | 1.0% | 19.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | East Moriches, NY | Patchogue, NY | United States |
| Married Population | 62.6% | 44.8% | 49.8% |
| Currently Married | 61.4% | 43.4% | 48.0% |
| Married but Separated | 1.2% | 1.5% | 1.8% |
| Single Population | 37.4% | 55.2% | 50.2% |
| Never Married | 24.5% | 39.9% | 33.8% |
| Divorced | 6.5% | 10.3% | 10.8% |
| Widowed | 6.4% | 5.0% | 5.6% |
| space5 | | | |
| Household Size | 2.66 | 2.38 | 2.60 |
| Households | 1,871 | 5,159 | 124,010,992 |
| Family Households | 1,437 | 2,985 | 80,755,759 |
| Married couple, w/children | 26.3% | 26.5% | 30.5% |
| Married couple, no children | 61.9% | 46.4% | 42.9% |
| Non Family Households | 434 | 2,174 | 43,255,233 |
| Single householder, w/children | 8.5% | 15.5% | 15.8% |
| Single householder, no children | 3.3% | 11.5% | 10.8% |