| | Westerlo, NY | Pleasant Valley, NY | United States |
| Population | 3,213 | 9,725 | 329,725,481 |
| Female Population | 45.5% | 51.4% | 50.5% |
| Male Population | 54.5% | 48.7% | 49.5% |
| Median Age | 44.4 | 40.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,363 | 9,680 | 309,327,143 |
| Population - 2000 | 3,466 | 9,066 | 285,036,114 |
| Population - 1990 | 3,325 | 8,063 | 251,960,433 |
| Pop. 2000 to Now | -6.0% | 6.1% | 15.6% |
| Pop. 1990 to Now | -2.1% | 19.3% | 30.8% |
| space4 | | | |
| Population Density | 55.6 | 298.5 | 93.4 |
| Land Area | 57.8 | 32.6 | 3,531,905.4 |
| Water Area | 0.7 | 0.6 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Westerlo, NY | Pleasant Valley, NY | United States |
| Age 0 to 4 | 4.0% | 5.8% | 5.9% |
| Age 5 to 9 | 6.9% | 4.5% | 6.1% |
| Age 10 to 14 | 6.7% | 6.2% | 6.6% |
| Age 15 to 17 | 3.0% | 3.1% | 3.9% |
| Age 18 to 20 | 4.0% | 3.1% | 4.0% |
| Age 21 to 24 | 5.7% | 6.1% | 5.2% |
| Age 25 to 34 | 9.0% | 13.9% | 13.8% |
| Age 35 to 44 | 12.6% | 11.0% | 12.9% |
| Age 45 to 54 | 9.9% | 16.8% | 12.6% |
| Age 55 to 59 | 9.6% | 9.5% | 6.7% |
| Age 60 to 64 | 7.3% | 6.7% | 6.3% |
| Age 65 to 74 | 12.9% | 8.3% | 9.6% |
| Age 75 to 84 | 6.8% | 3.7% | 4.5% |
| Age 85 and over | 1.7% | 1.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Westerlo, NY | Pleasant Valley, NY | United States |
| White | 96.0% | 81.3% | 59.4% |
| Black | 0.8% | 1.0% | 12.2% |
| Asian | 0.2% | 1.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.8% | 0.4% |
| Two or More Races | 2.5% | 4.1% | 3.2% |
| Hispanic | 0.5% | 11.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Westerlo, NY | Pleasant Valley, NY | United States |
| Married Population | 61.4% | 55.9% | 49.8% |
| Currently Married | 60.7% | 54.8% | 48.0% |
| Married but Separated | 0.7% | 1.1% | 1.8% |
| Single Population | 38.6% | 44.1% | 50.2% |
| Never Married | 25.7% | 30.2% | 33.8% |
| Divorced | 7.7% | 8.7% | 10.8% |
| Widowed | 5.1% | 5.1% | 5.6% |
| space5 | | | |
| Household Size | 2.61 | 2.46 | 2.60 |
| Households | 1,227 | 3,921 | 124,010,992 |
| Family Households | 1,000 | 2,591 | 80,755,759 |
| Married couple, w/children | 20.9% | 33.5% | 30.5% |
| Married couple, no children | 57.2% | 45.8% | 42.9% |
| Non Family Households | 227 | 1,330 | 43,255,233 |
| Single householder, w/children | 14.6% | 8.0% | 15.8% |
| Single householder, no children | 7.3% | 12.6% | 10.8% |