| | Berwick, PA | Williamsburg, PA | United States |
| Population | 10,355 | 1,161 | 329,725,481 |
| Female Population | 48.9% | 49.8% | 50.5% |
| Male Population | 51.1% | 50.2% | 49.5% |
| Median Age | 44.6 | 36.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 10,490 | 1,248 | 309,327,143 |
| Population - 2000 | 10,774 | 1,345 | 285,036,114 |
| Population - 1990 | 10,976 | 1,456 | 251,960,433 |
| Pop. 2000 to Now | -8.5% | -13.2% | 15.6% |
| Pop. 1990 to Now | -10.2% | -19.9% | 30.8% |
| space4 | | | |
| Population Density | 3,366.4 | 3,172.1 | 93.4 |
| Land Area | 3.1 | 0.4 | 3,531,905.4 |
| Water Area | 0.2 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Berwick, PA | Williamsburg, PA | United States |
| Age 0 to 4 | 4.5% | 8.4% | 5.9% |
| Age 5 to 9 | 2.4% | 6.8% | 6.1% |
| Age 10 to 14 | 9.6% | 8.1% | 6.6% |
| Age 15 to 17 | 3.1% | 2.3% | 3.9% |
| Age 18 to 20 | 1.4% | 3.0% | 4.0% |
| Age 21 to 24 | 8.2% | 5.6% | 5.2% |
| Age 25 to 34 | 11.4% | 13.0% | 13.8% |
| Age 35 to 44 | 10.4% | 12.1% | 12.9% |
| Age 45 to 54 | 15.2% | 12.0% | 12.6% |
| Age 55 to 59 | 8.6% | 4.8% | 6.7% |
| Age 60 to 64 | 6.9% | 4.5% | 6.3% |
| Age 65 to 74 | 8.4% | 12.1% | 9.6% |
| Age 75 to 84 | 5.4% | 5.9% | 4.5% |
| Age 85 and over | 4.6% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Berwick, PA | Williamsburg, PA | United States |
| White | 89.9% | 92.3% | 59.4% |
| Black | 2.8% | 0.0% | 12.2% |
| Asian | 0.2% | 0.6% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 2.6% | 5.9% | 3.2% |
| Hispanic | 4.3% | 1.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Berwick, PA | Williamsburg, PA | United States |
| Married Population | 43.3% | 49.3% | 49.8% |
| Currently Married | 42.3% | 48.0% | 48.0% |
| Married but Separated | 1.0% | 1.2% | 1.8% |
| Single Population | 56.7% | 50.7% | 50.2% |
| Never Married | 33.0% | 31.1% | 33.8% |
| Divorced | 15.2% | 12.8% | 10.8% |
| Widowed | 8.6% | 6.8% | 5.6% |
| space5 | | | |
| Household Size | 2.30 | 2.46 | 2.60 |
| Households | 4,475 | 472 | 124,010,992 |
| Family Households | 2,652 | 288 | 80,755,759 |
| Married couple, w/children | 15.1% | 30.9% | 30.5% |
| Married couple, no children | 49.7% | 39.6% | 42.9% |
| Non Family Households | 1,823 | 184 | 43,255,233 |
| Single householder, w/children | 22.7% | 19.4% | 15.8% |
| Single householder, no children | 12.5% | 10.1% | 10.8% |