| | Port Jervis, NY | Johnson City, NY | United States |
| Population | 8,772 | 15,275 | 329,725,481 |
| Female Population | 50.5% | 48.0% | 50.5% |
| Male Population | 49.5% | 52.0% | 49.5% |
| Median Age | 42 | 37.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 8,838 | 15,151 | 309,327,143 |
| Population - 2000 | 8,860 | 15,535 | 285,036,114 |
| Population - 1990 | 9,060 | 16,890 | 251,960,433 |
| Pop. 2000 to Now | -4.6% | -9.7% | 15.6% |
| Pop. 1990 to Now | -6.7% | -16.9% | 30.8% |
| space4 | | | |
| Population Density | 3,468.6 | 3,355.7 | 93.4 |
| Land Area | 2.5 | 4.6 | 3,531,905.4 |
| Water Area | 0.2 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Port Jervis, NY | Johnson City, NY | United States |
| Age 0 to 4 | 5.4% | 5.4% | 5.9% |
| Age 5 to 9 | 6.2% | 6.2% | 6.1% |
| Age 10 to 14 | 6.9% | 4.7% | 6.6% |
| Age 15 to 17 | 3.2% | 3.5% | 3.9% |
| Age 18 to 20 | 3.5% | 2.8% | 4.0% |
| Age 21 to 24 | 7.0% | 9.3% | 5.2% |
| Age 25 to 34 | 10.1% | 15.7% | 13.8% |
| Age 35 to 44 | 10.9% | 8.8% | 12.9% |
| Age 45 to 54 | 11.9% | 12.8% | 12.6% |
| Age 55 to 59 | 7.5% | 5.3% | 6.7% |
| Age 60 to 64 | 7.7% | 6.7% | 6.3% |
| Age 65 to 74 | 10.9% | 10.7% | 9.6% |
| Age 75 to 84 | 5.0% | 5.6% | 4.5% |
| Age 85 and over | 3.9% | 2.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Port Jervis, NY | Johnson City, NY | United States |
| White | 65.4% | 78.2% | 59.4% |
| Black | 6.7% | 5.2% | 12.2% |
| Asian | 5.4% | 6.4% | 5.6% |
| Native American | 1.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 3.9% | 3.6% | 3.2% |
| Hispanic | 17.3% | 6.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Port Jervis, NY | Johnson City, NY | United States |
| Married Population | 38.9% | 38.6% | 49.8% |
| Currently Married | 37.4% | 35.9% | 48.0% |
| Married but Separated | 1.5% | 2.7% | 1.8% |
| Single Population | 61.1% | 61.4% | 50.2% |
| Never Married | 37.9% | 43.4% | 33.8% |
| Divorced | 14.4% | 9.7% | 10.8% |
| Widowed | 8.7% | 8.3% | 5.6% |
| space5 | | | |
| Household Size | 2.44 | 2.21 | 2.60 |
| Households | 3,566 | 6,768 | 124,010,992 |
| Family Households | 1,817 | 3,401 | 80,755,759 |
| Married couple, w/children | 36.2% | 20.0% | 30.5% |
| Married couple, no children | 33.5% | 41.9% | 42.9% |
| Non Family Households | 1,749 | 3,367 | 43,255,233 |
| Single householder, w/children | 21.2% | 24.0% | 15.8% |
| Single householder, no children | 9.1% | 14.1% | 10.8% |