| | Fredon, NJ | Denville, NJ | United States |
| Population | 3,242 | 17,068 | 329,725,481 |
| Female Population | 49.5% | 49.2% | 50.5% |
| Male Population | 50.6% | 50.8% | 49.5% |
| Median Age | 48.3 | 44.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,379 | 16,683 | 309,327,143 |
| Population - 2000 | 2,860 | 15,824 | 285,036,114 |
| Population - 1990 | 2,763 | 13,812 | 251,960,433 |
| Pop. 2000 to Now | 10.0% | 3.4% | 15.6% |
| Pop. 1990 to Now | 13.8% | 18.5% | 30.8% |
| space4 | | | |
| Population Density | 183.3 | 1,430.4 | 93.4 |
| Land Area | 17.7 | 11.9 | 3,531,905.4 |
| Water Area | 0.3 | 0.8 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Fredon, NJ | Denville, NJ | United States |
| Age 0 to 4 | 4.0% | 5.5% | 5.9% |
| Age 5 to 9 | 5.5% | 6.7% | 6.1% |
| Age 10 to 14 | 7.9% | 5.1% | 6.6% |
| Age 15 to 17 | 5.0% | 2.5% | 3.9% |
| Age 18 to 20 | 2.8% | 3.4% | 4.0% |
| Age 21 to 24 | 4.5% | 4.4% | 5.2% |
| Age 25 to 34 | 9.6% | 9.8% | 13.8% |
| Age 35 to 44 | 4.5% | 12.9% | 12.9% |
| Age 45 to 54 | 18.5% | 14.6% | 12.6% |
| Age 55 to 59 | 9.5% | 7.9% | 6.7% |
| Age 60 to 64 | 8.6% | 8.6% | 6.3% |
| Age 65 to 74 | 13.8% | 9.9% | 9.6% |
| Age 75 to 84 | 4.8% | 5.5% | 4.5% |
| Age 85 and over | 1.1% | 3.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Fredon, NJ | Denville, NJ | United States |
| White | 91.0% | 80.4% | 59.4% |
| Black | 0.2% | 2.3% | 12.2% |
| Asian | 1.2% | 7.6% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.0% | 0.0% | 0.4% |
| Two or More Races | 3.9% | 3.3% | 3.2% |
| Hispanic | 2.7% | 6.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Fredon, NJ | Denville, NJ | United States |
| Married Population | 68.1% | 60.7% | 49.8% |
| Currently Married | 67.8% | 59.7% | 48.0% |
| Married but Separated | 0.4% | 1.0% | 1.8% |
| Single Population | 31.9% | 39.3% | 50.2% |
| Never Married | 24.1% | 23.5% | 33.8% |
| Divorced | 4.1% | 9.8% | 10.8% |
| Widowed | 3.6% | 6.1% | 5.6% |
| space5 | | | |
| Household Size | 2.89 | 2.60 | 2.60 |
| Households | 1,116 | 6,514 | 124,010,992 |
| Family Households | 956 | 4,865 | 80,755,759 |
| Married couple, w/children | 37.7% | 33.8% | 30.5% |
| Married couple, no children | 54.4% | 51.5% | 42.9% |
| Non Family Households | 160 | 1,649 | 43,255,233 |
| Single householder, w/children | 1.2% | 5.6% | 15.8% |
| Single householder, no children | 6.8% | 9.1% | 10.8% |