| | South Amboy, NJ | South Deerfield, MA | United States |
| Population | 9,320 | 2,244 | 329,725,481 |
| Female Population | 52.5% | 49.6% | 50.5% |
| Male Population | 47.5% | 50.4% | 49.5% |
| Median Age | 41.4 | 51.4 | 38.4 |
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| Population - 2010 | 8,570 | 1,801 | 309,327,143 |
| Population - 2000 | 7,913 | 1,868 | 285,036,114 |
| Population - 1990 | 7,863 | 1,906 | 251,960,433 |
| Pop. 2000 to Now | 14.9% | -16.2% | 15.6% |
| Pop. 1990 to Now | 15.7% | -17.8% | 30.8% |
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| Population Density | 6,059.8 | 711.5 | 93.4 |
| Land Area | 1.5 | 3.2 | 3,531,905.4 |
| Water Area | 1.1 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | South Amboy, NJ | South Deerfield, MA | United States |
| Age 0 to 4 | 4.2% | 1.7% | 5.9% |
| Age 5 to 9 | 4.2% | 2.8% | 6.1% |
| Age 10 to 14 | 5.2% | 6.1% | 6.6% |
| Age 15 to 17 | 1.2% | 8.6% | 3.9% |
| Age 18 to 20 | 4.1% | 1.1% | 4.0% |
| Age 21 to 24 | 5.2% | 0.8% | 5.2% |
| Age 25 to 34 | 14.8% | 9.3% | 13.8% |
| Age 35 to 44 | 15.7% | 8.8% | 12.9% |
| Age 45 to 54 | 12.0% | 15.9% | 12.6% |
| Age 55 to 59 | 11.0% | 14.3% | 6.7% |
| Age 60 to 64 | 8.4% | 13.3% | 6.3% |
| Age 65 to 74 | 11.0% | 9.5% | 9.6% |
| Age 75 to 84 | 2.3% | 6.5% | 4.5% |
| Age 85 and over | 0.8% | 1.3% | 1.9% |
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| Race | | | |
| | South Amboy, NJ | South Deerfield, MA | United States |
| White | 63.0% | 89.4% | 59.4% |
| Black | 10.3% | 0.0% | 12.2% |
| Asian | 2.6% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.8% | 3.1% | 3.2% |
| Hispanic | 22.2% | 7.5% | 18.4% |
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| Marriage & Family | | | |
| | South Amboy, NJ | South Deerfield, MA | United States |
| Married Population | 53.2% | 40.4% | 49.8% |
| Currently Married | 51.9% | 37.1% | 48.0% |
| Married but Separated | 1.3% | 3.3% | 1.8% |
| Single Population | 46.8% | 59.6% | 50.2% |
| Never Married | 32.6% | 45.4% | 33.8% |
| Divorced | 9.5% | 9.9% | 10.8% |
| Widowed | 4.7% | 4.4% | 5.6% |
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| Household Size | 2.41 | 2.04 | 2.60 |
| Households | 3,857 | 1,099 | 124,010,992 |
| Family Households | 2,750 | 559 | 80,755,759 |
| Married couple, w/children | 21.9% | 14.0% | 30.5% |
| Married couple, no children | 47.9% | 45.3% | 42.9% |
| Non Family Households | 1,107 | 540 | 43,255,233 |
| Single householder, w/children | 14.4% | 23.3% | 15.8% |
| Single householder, no children | 15.7% | 17.5% | 10.8% |