| | Chatham, MA | Old Tappan, NJ | United States |
| Population | 6,554 | 5,870 | 329,725,481 |
| Female Population | 48.9% | 49.3% | 50.5% |
| Male Population | 51.1% | 50.8% | 49.5% |
| Median Age | 62.5 | 44.5 | 38.4 |
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| Population - 2010 | 6,119 | 5,753 | 309,327,143 |
| Population - 2000 | 6,625 | 5,482 | 285,036,114 |
| Population - 1990 | 6,579 | 4,254 | 251,960,433 |
| Pop. 2000 to Now | -9.5% | 7.1% | 15.6% |
| Pop. 1990 to Now | -8.9% | 38.0% | 30.8% |
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| Population Density | 406.3 | 1,770.7 | 93.4 |
| Land Area | 16.1 | 3.3 | 3,531,905.4 |
| Water Area | 8.3 | 0.8 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Chatham, MA | Old Tappan, NJ | United States |
| Age 0 to 4 | 3.5% | 4.8% | 5.9% |
| Age 5 to 9 | 1.0% | 7.5% | 6.1% |
| Age 10 to 14 | 2.4% | 8.2% | 6.6% |
| Age 15 to 17 | 2.4% | 5.9% | 3.9% |
| Age 18 to 20 | 1.9% | 1.2% | 4.0% |
| Age 21 to 24 | 3.2% | 4.4% | 5.2% |
| Age 25 to 34 | 7.1% | 7.7% | 13.8% |
| Age 35 to 44 | 5.7% | 10.6% | 12.9% |
| Age 45 to 54 | 8.9% | 17.0% | 12.6% |
| Age 55 to 59 | 8.8% | 7.7% | 6.7% |
| Age 60 to 64 | 8.7% | 7.7% | 6.3% |
| Age 65 to 74 | 21.6% | 9.9% | 9.6% |
| Age 75 to 84 | 16.6% | 5.4% | 4.5% |
| Age 85 and over | 8.2% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Chatham, MA | Old Tappan, NJ | United States |
| White | 95.1% | 55.0% | 59.4% |
| Black | 1.1% | 0.0% | 12.2% |
| Asian | 2.1% | 35.6% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.5% | 2.5% | 3.2% |
| Hispanic | 1.3% | 6.7% | 18.4% |
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| Marriage & Family | | | |
| | Chatham, MA | Old Tappan, NJ | United States |
| Married Population | 59.2% | 68.1% | 49.8% |
| Currently Married | 58.9% | 68.1% | 48.0% |
| Married but Separated | 0.3% | 0.0% | 1.8% |
| Single Population | 40.8% | 31.9% | 50.2% |
| Never Married | 22.8% | 23.2% | 33.8% |
| Divorced | 8.5% | 5.6% | 10.8% |
| Widowed | 9.5% | 3.1% | 5.6% |
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| Household Size | 2.02 | 3.05 | 2.60 |
| Households | 3,164 | 1,923 | 124,010,992 |
| Family Households | 2,031 | 1,680 | 80,755,759 |
| Married couple, w/children | 11.0% | 47.1% | 30.5% |
| Married couple, no children | 76.1% | 42.6% | 42.9% |
| Non Family Households | 1,133 | 243 | 43,255,233 |
| Single householder, w/children | 4.5% | 3.0% | 15.8% |
| Single householder, no children | 8.4% | 7.3% | 10.8% |