| | Blairstown township, NJ | Kinnelon, NJ | United States |
| Population | 5,716 | 9,994 | 329,725,481 |
| Female Population | 47.3% | 49.0% | 50.5% |
| Male Population | 52.8% | 51.0% | 49.5% |
| Median Age | 51.3 | 41.5 | 38.4 |
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| Population - 2010 | 5,931 | 10,124 | 309,327,143 |
| Population - 2000 | 5,747 | 9,365 | 285,036,114 |
| Population - 1990 | 5,331 | 8,470 | 251,960,433 |
| Pop. 2000 to Now | -0.8% | 5.2% | 15.6% |
| Pop. 1990 to Now | 6.9% | 16.3% | 30.8% |
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| Population Density | 185.5 | 554.9 | 93.4 |
| Land Area | 30.8 | 18.0 | 3,531,905.4 |
| Water Area | 0.9 | 1.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Blairstown township, NJ | Kinnelon, NJ | United States |
| Age 0 to 4 | 3.5% | 3.8% | 5.9% |
| Age 5 to 9 | 3.5% | 5.9% | 6.1% |
| Age 10 to 14 | 5.7% | 7.1% | 6.6% |
| Age 15 to 17 | 2.8% | 4.6% | 3.9% |
| Age 18 to 20 | 1.4% | 5.3% | 4.0% |
| Age 21 to 24 | 8.0% | 6.6% | 5.2% |
| Age 25 to 34 | 8.5% | 8.8% | 13.8% |
| Age 35 to 44 | 11.6% | 12.6% | 12.9% |
| Age 45 to 54 | 15.2% | 13.4% | 12.6% |
| Age 55 to 59 | 9.2% | 7.8% | 6.7% |
| Age 60 to 64 | 10.7% | 9.1% | 6.3% |
| Age 65 to 74 | 9.2% | 9.9% | 9.6% |
| Age 75 to 84 | 4.7% | 4.0% | 4.5% |
| Age 85 and over | 6.2% | 1.1% | 1.9% |
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| Race | | | |
| | Blairstown township, NJ | Kinnelon, NJ | United States |
| White | 91.2% | 88.2% | 59.4% |
| Black | 0.9% | 0.1% | 12.2% |
| Asian | 1.1% | 6.2% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 3.1% | 0.8% | 3.2% |
| Hispanic | 3.4% | 4.4% | 18.4% |
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| Marriage & Family | | | |
| | Blairstown township, NJ | Kinnelon, NJ | United States |
| Married Population | 63.4% | 55.5% | 49.8% |
| Currently Married | 63.0% | 55.0% | 48.0% |
| Married but Separated | 0.3% | 0.5% | 1.8% |
| Single Population | 36.6% | 44.5% | 50.2% |
| Never Married | 25.9% | 31.7% | 33.8% |
| Divorced | 5.5% | 6.0% | 10.8% |
| Widowed | 5.2% | 6.8% | 5.6% |
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| Household Size | 2.73 | 3.03 | 2.60 |
| Households | 2,056 | 3,302 | 124,010,992 |
| Family Households | 1,607 | 2,884 | 80,755,759 |
| Married couple, w/children | 32.0% | 33.7% | 30.5% |
| Married couple, no children | 61.4% | 43.2% | 42.9% |
| Non Family Households | 449 | 418 | 43,255,233 |
| Single householder, w/children | 0.7% | 5.5% | 15.8% |
| Single householder, no children | 5.9% | 17.5% | 10.8% |