| | Portville, NY | Cuba, NY | United States |
| Population | 3,532 | 3,153 | 329,725,481 |
| Female Population | 52.5% | 49.5% | 50.5% |
| Male Population | 47.5% | 50.5% | 49.5% |
| Median Age | 45.1 | 50.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,730 | 3,238 | 309,327,143 |
| Population - 2000 | 3,952 | 3,392 | 285,036,114 |
| Population - 1990 | 4,397 | 3,401 | 251,960,433 |
| Pop. 2000 to Now | -11.3% | -10.1% | 15.6% |
| Pop. 1990 to Now | -20.3% | -10.4% | 30.8% |
| space4 | | | |
| Population Density | 99.3 | 90.0 | 93.4 |
| Land Area | 35.6 | 35.0 | 3,531,905.4 |
| Water Area | 0.4 | 0.8 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Portville, NY | Cuba, NY | United States |
| Age 0 to 4 | 5.1% | 4.7% | 5.9% |
| Age 5 to 9 | 6.5% | 6.3% | 6.1% |
| Age 10 to 14 | 8.7% | 5.1% | 6.6% |
| Age 15 to 17 | 4.4% | 5.1% | 3.9% |
| Age 18 to 20 | 1.4% | 2.2% | 4.0% |
| Age 21 to 24 | 3.7% | 1.5% | 5.2% |
| Age 25 to 34 | 10.2% | 11.6% | 13.8% |
| Age 35 to 44 | 9.8% | 9.5% | 12.9% |
| Age 45 to 54 | 12.7% | 13.5% | 12.6% |
| Age 55 to 59 | 8.7% | 6.6% | 6.7% |
| Age 60 to 64 | 7.2% | 11.0% | 6.3% |
| Age 65 to 74 | 13.9% | 14.5% | 9.6% |
| Age 75 to 84 | 5.6% | 6.0% | 4.5% |
| Age 85 and over | 2.2% | 2.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Portville, NY | Cuba, NY | United States |
| White | 94.1% | 97.7% | 59.4% |
| Black | 2.4% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.5% | 1.4% | 3.2% |
| Hispanic | 0.7% | 0.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Portville, NY | Cuba, NY | United States |
| Married Population | 63.0% | 59.5% | 49.8% |
| Currently Married | 62.7% | 57.1% | 48.0% |
| Married but Separated | 0.3% | 2.3% | 1.8% |
| Single Population | 37.0% | 40.5% | 50.2% |
| Never Married | 21.8% | 24.0% | 33.8% |
| Divorced | 9.6% | 10.8% | 10.8% |
| Widowed | 5.6% | 5.7% | 5.6% |
| space5 | | | |
| Household Size | 2.53 | 2.47 | 2.60 |
| Households | 1,390 | 1,253 | 124,010,992 |
| Family Households | 1,027 | 822 | 80,755,759 |
| Married couple, w/children | 32.3% | 24.8% | 30.5% |
| Married couple, no children | 48.0% | 58.9% | 42.9% |
| Non Family Households | 363 | 431 | 43,255,233 |
| Single householder, w/children | 14.0% | 11.8% | 15.8% |
| Single householder, no children | 5.6% | 4.5% | 10.8% |