| | Stafford, NJ | Williamstown, NJ | United States |
| Population | 28,492 | 14,947 | 329,725,481 |
| Female Population | 49.3% | 53.1% | 50.5% |
| Male Population | 50.7% | 46.9% | 49.5% |
| Median Age | 46.3 | 40.8 | 38.4 |
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| Population - 2010 | 26,586 | 14,232 | 309,327,143 |
| Population - 2000 | 22,532 | 11,812 | 285,036,114 |
| Population - 1990 | 13,325 | 10,891 | 251,960,433 |
| Pop. 2000 to Now | 26.6% | 29.6% | 15.6% |
| Pop. 1990 to Now | 114.1% | 40.6% | 30.8% |
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| Population Density | 621.4 | 2,013.6 | 93.4 |
| Land Area | 45.8 | 7.4 | 3,531,905.4 |
| Water Area | 9.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Stafford, NJ | Williamstown, NJ | United States |
| Age 0 to 4 | 3.7% | 4.4% | 5.9% |
| Age 5 to 9 | 5.0% | 6.9% | 6.1% |
| Age 10 to 14 | 6.7% | 5.9% | 6.6% |
| Age 15 to 17 | 3.6% | 4.9% | 3.9% |
| Age 18 to 20 | 3.3% | 2.6% | 4.0% |
| Age 21 to 24 | 3.1% | 6.0% | 5.2% |
| Age 25 to 34 | 11.0% | 11.7% | 13.8% |
| Age 35 to 44 | 11.7% | 12.5% | 12.9% |
| Age 45 to 54 | 16.5% | 14.6% | 12.6% |
| Age 55 to 59 | 7.8% | 7.5% | 6.7% |
| Age 60 to 64 | 7.1% | 6.8% | 6.3% |
| Age 65 to 74 | 10.3% | 8.9% | 9.6% |
| Age 75 to 84 | 7.8% | 3.9% | 4.5% |
| Age 85 and over | 2.5% | 3.4% | 1.9% |
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| Race | | | |
| | Stafford, NJ | Williamstown, NJ | United States |
| White | 89.7% | 78.5% | 59.4% |
| Black | 0.4% | 9.4% | 12.2% |
| Asian | 0.7% | 1.4% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 2.5% | 4.7% | 3.2% |
| Hispanic | 6.3% | 6.0% | 18.4% |
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| Marriage & Family | | | |
| | Stafford, NJ | Williamstown, NJ | United States |
| Married Population | 54.7% | 51.3% | 49.8% |
| Currently Married | 53.8% | 50.3% | 48.0% |
| Married but Separated | 0.9% | 1.1% | 1.8% |
| Single Population | 45.3% | 48.7% | 50.2% |
| Never Married | 29.1% | 29.6% | 33.8% |
| Divorced | 10.2% | 11.6% | 10.8% |
| Widowed | 6.0% | 7.5% | 5.6% |
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| Household Size | 2.48 | 2.61 | 2.60 |
| Households | 11,414 | 5,661 | 124,010,992 |
| Family Households | 7,970 | 3,803 | 80,755,759 |
| Married couple, w/children | 29.7% | 37.1% | 30.5% |
| Married couple, no children | 47.7% | 40.7% | 42.9% |
| Non Family Households | 3,444 | 1,858 | 43,255,233 |
| Single householder, w/children | 12.8% | 11.8% | 15.8% |
| Single householder, no children | 9.8% | 10.5% | 10.8% |