| | Tewksbury, NJ | Califon, NJ | United States |
| Population | 5,867 | 1,041 | 329,725,481 |
| Female Population | 51.6% | 49.7% | 50.5% |
| Male Population | 48.4% | 50.3% | 49.5% |
| Median Age | 55.8 | 41.7 | 38.4 |
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| Population - 2010 | 5,975 | 1,062 | 309,327,143 |
| Population - 2000 | 5,541 | 1,055 | 285,036,114 |
| Population - 1990 | 4,803 | 1,073 | 251,960,433 |
| Pop. 2000 to Now | 3.7% | -2.1% | 15.6% |
| Pop. 1990 to Now | 19.6% | -3.7% | 30.8% |
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| Population Density | 186.1 | 1,085.5 | 93.4 |
| Land Area | 31.5 | 1.0 | 3,531,905.4 |
| Water Area | 0.2 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Tewksbury, NJ | Califon, NJ | United States |
| Age 0 to 4 | 3.5% | 4.8% | 5.9% |
| Age 5 to 9 | 4.2% | 7.8% | 6.1% |
| Age 10 to 14 | 6.0% | 5.2% | 6.6% |
| Age 15 to 17 | 5.1% | 4.8% | 3.9% |
| Age 18 to 20 | 3.2% | 2.2% | 4.0% |
| Age 21 to 24 | 3.7% | 4.1% | 5.2% |
| Age 25 to 34 | 3.6% | 11.5% | 13.8% |
| Age 35 to 44 | 6.1% | 14.0% | 12.9% |
| Age 45 to 54 | 14.1% | 21.3% | 12.6% |
| Age 55 to 59 | 16.0% | 8.2% | 6.7% |
| Age 60 to 64 | 9.3% | 3.7% | 6.3% |
| Age 65 to 74 | 14.4% | 8.6% | 9.6% |
| Age 75 to 84 | 8.1% | 2.1% | 4.5% |
| Age 85 and over | 3.0% | 1.6% | 1.9% |
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| Race | | | |
| | Tewksbury, NJ | Califon, NJ | United States |
| White | 88.7% | 97.0% | 59.4% |
| Black | 2.9% | 0.0% | 12.2% |
| Asian | 3.4% | 1.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.3% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 1.4% | 0.6% | 3.2% |
| Hispanic | 3.2% | 1.2% | 18.4% |
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| Marriage & Family | | | |
| | Tewksbury, NJ | Califon, NJ | United States |
| Married Population | 66.6% | 53.6% | 49.8% |
| Currently Married | 66.0% | 52.0% | 48.0% |
| Married but Separated | 0.5% | 1.6% | 1.8% |
| Single Population | 33.4% | 46.4% | 50.2% |
| Never Married | 22.1% | 31.4% | 33.8% |
| Divorced | 5.3% | 10.3% | 10.8% |
| Widowed | 6.0% | 4.7% | 5.6% |
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| Household Size | 2.62 | 2.36 | 2.60 |
| Households | 2,238 | 441 | 124,010,992 |
| Family Households | 1,883 | 275 | 80,755,759 |
| Married couple, w/children | 20.4% | 39.6% | 30.5% |
| Married couple, no children | 59.5% | 38.5% | 42.9% |
| Non Family Households | 355 | 166 | 43,255,233 |
| Single householder, w/children | 6.5% | 12.7% | 15.8% |
| Single householder, no children | 13.6% | 9.1% | 10.8% |