| | Northfield, NJ | Haddonfield, NJ | United States |
| Population | 8,419 | 12,383 | 329,725,481 |
| Female Population | 52.0% | 50.3% | 50.5% |
| Male Population | 48.0% | 49.8% | 49.5% |
| Median Age | 44.7 | 39.6 | 38.4 |
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| Population - 2010 | 8,517 | 11,599 | 309,327,143 |
| Population - 2000 | 7,725 | 11,659 | 285,036,114 |
| Population - 1990 | 7,305 | 11,628 | 251,960,433 |
| Pop. 2000 to Now | 4.2% | -2.9% | 15.6% |
| Pop. 1990 to Now | 10.2% | -2.6% | 30.8% |
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| Population Density | 2,350.4 | 4,428.8 | 93.4 |
| Land Area | 3.6 | 2.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Northfield, NJ | Haddonfield, NJ | United States |
| Age 0 to 4 | 2.5% | 7.9% | 5.9% |
| Age 5 to 9 | 5.7% | 8.5% | 6.1% |
| Age 10 to 14 | 7.8% | 9.6% | 6.6% |
| Age 15 to 17 | 4.2% | 6.0% | 3.9% |
| Age 18 to 20 | 4.8% | 2.0% | 4.0% |
| Age 21 to 24 | 3.0% | 2.2% | 5.2% |
| Age 25 to 34 | 10.3% | 7.2% | 13.8% |
| Age 35 to 44 | 12.3% | 16.5% | 12.9% |
| Age 45 to 54 | 13.6% | 16.4% | 12.6% |
| Age 55 to 59 | 8.8% | 5.3% | 6.7% |
| Age 60 to 64 | 8.8% | 3.9% | 6.3% |
| Age 65 to 74 | 8.6% | 7.5% | 9.6% |
| Age 75 to 84 | 7.3% | 5.1% | 4.5% |
| Age 85 and over | 2.3% | 1.8% | 1.9% |
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| Race | | | |
| | Northfield, NJ | Haddonfield, NJ | United States |
| White | 75.8% | 90.2% | 59.4% |
| Black | 2.4% | 0.6% | 12.2% |
| Asian | 7.7% | 1.3% | 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 | 0.9% | 2.6% | 3.2% |
| Hispanic | 12.9% | 5.3% | 18.4% |
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| Marriage & Family | | | |
| | Northfield, NJ | Haddonfield, NJ | United States |
| Married Population | 50.7% | 66.6% | 49.8% |
| Currently Married | 49.9% | 66.3% | 48.0% |
| Married but Separated | 0.8% | 0.3% | 1.8% |
| Single Population | 49.3% | 33.4% | 50.2% |
| Never Married | 30.1% | 22.4% | 33.8% |
| Divorced | 12.1% | 6.2% | 10.8% |
| Widowed | 7.2% | 4.7% | 5.6% |
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| Household Size | 2.68 | 2.89 | 2.60 |
| Households | 3,084 | 4,274 | 124,010,992 |
| Family Households | 2,120 | 3,329 | 80,755,759 |
| Married couple, w/children | 35.1% | 52.8% | 30.5% |
| Married couple, no children | 42.2% | 36.1% | 42.9% |
| Non Family Households | 964 | 945 | 43,255,233 |
| Single householder, w/children | 8.6% | 7.6% | 15.8% |
| Single householder, no children | 14.1% | 3.5% | 10.8% |