| | Persia, NY | Port Jefferson Station, NY | United States |
| Population | 2,510 | 7,716 | 329,725,481 |
| Female Population | 48.7% | 51.9% | 50.5% |
| Male Population | 51.4% | 48.1% | 49.5% |
| Median Age | 38.3 | 38.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,406 | 7,521 | 309,327,143 |
| Population - 2000 | 2,512 | 7,527 | 285,036,114 |
| Population - 1990 | 2,530 | 7,232 | 251,960,433 |
| Pop. 2000 to Now | -11.3% | -4.1% | 15.6% |
| Pop. 1990 to Now | -11.9% | -0.2% | 30.8% |
| space4 | | | |
| Population Density | 120.1 | 2,909.5 | 93.4 |
| Land Area | 20.9 | 2.7 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Persia, NY | Port Jefferson Station, NY | United States |
| Age 0 to 4 | 9.1% | 7.0% | 5.9% |
| Age 5 to 9 | 6.3% | 7.2% | 6.1% |
| Age 10 to 14 | 2.9% | 2.9% | 6.6% |
| Age 15 to 17 | 2.5% | 3.4% | 3.9% |
| Age 18 to 20 | 4.1% | 3.2% | 4.0% |
| Age 21 to 24 | 5.5% | 8.0% | 5.2% |
| Age 25 to 34 | 15.2% | 13.7% | 13.8% |
| Age 35 to 44 | 12.0% | 12.4% | 12.9% |
| Age 45 to 54 | 10.9% | 11.0% | 12.6% |
| Age 55 to 59 | 4.5% | 8.6% | 6.7% |
| Age 60 to 64 | 6.7% | 7.0% | 6.3% |
| Age 65 to 74 | 10.3% | 9.1% | 9.6% |
| Age 75 to 84 | 6.4% | 4.5% | 4.5% |
| Age 85 and over | 3.6% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Persia, NY | Port Jefferson Station, NY | United States |
| White | 84.8% | 73.3% | 59.4% |
| Black | 0.2% | 2.0% | 12.2% |
| Asian | 0.8% | 1.7% | 5.6% |
| Native American | 4.9% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.8% | 2.0% | 3.2% |
| Hispanic | 7.5% | 21.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Persia, NY | Port Jefferson Station, NY | United States |
| Married Population | 39.4% | 59.7% | 49.8% |
| Currently Married | 37.6% | 58.4% | 48.0% |
| Married but Separated | 1.8% | 1.3% | 1.8% |
| Single Population | 60.6% | 40.3% | 50.2% |
| Never Married | 36.7% | 32.6% | 33.8% |
| Divorced | 14.3% | 4.4% | 10.8% |
| Widowed | 9.6% | 3.2% | 5.6% |
| space5 | | | |
| Household Size | 2.52 | 2.97 | 2.60 |
| Households | 941 | 2,579 | 124,010,992 |
| Family Households | 514 | 1,974 | 80,755,759 |
| Married couple, w/children | 24.3% | 35.7% | 30.5% |
| Married couple, no children | 37.4% | 52.3% | 42.9% |
| Non Family Households | 427 | 605 | 43,255,233 |
| Single householder, w/children | 24.7% | 8.1% | 15.8% |
| Single householder, no children | 13.6% | 4.0% | 10.8% |