| | Colts Neck, NJ | Rumson, NJ | United States |
| Population | 9,975 | 7,292 | 329,725,481 |
| Female Population | 51.8% | 48.0% | 50.5% |
| Male Population | 48.2% | 52.0% | 49.5% |
| Median Age | 48 | 42.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 10,149 | 7,072 | 309,327,143 |
| Population - 2000 | 12,331 | 7,137 | 285,036,114 |
| Population - 1990 | 8,559 | 6,701 | 251,960,433 |
| Pop. 2000 to Now | -20.2% | -6.5% | 15.6% |
| Pop. 1990 to Now | 15.0% | -0.5% | 30.8% |
| space4 | | | |
| Population Density | 324.6 | 1,439.1 | 93.4 |
| Land Area | 30.7 | 5.1 | 3,531,905.4 |
| Water Area | 1.1 | 2.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Colts Neck, NJ | Rumson, NJ | United States |
| Age 0 to 4 | 3.0% | 3.5% | 5.9% |
| Age 5 to 9 | 7.3% | 9.2% | 6.1% |
| Age 10 to 14 | 9.0% | 11.2% | 6.6% |
| Age 15 to 17 | 4.2% | 6.3% | 3.9% |
| Age 18 to 20 | 4.2% | 4.0% | 4.0% |
| Age 21 to 24 | 5.1% | 6.1% | 5.2% |
| Age 25 to 34 | 4.9% | 2.9% | 13.8% |
| Age 35 to 44 | 8.2% | 10.6% | 12.9% |
| Age 45 to 54 | 18.2% | 17.6% | 12.6% |
| Age 55 to 59 | 9.3% | 10.0% | 6.7% |
| Age 60 to 64 | 9.7% | 5.7% | 6.3% |
| Age 65 to 74 | 12.2% | 7.2% | 9.6% |
| Age 75 to 84 | 3.4% | 4.8% | 4.5% |
| Age 85 and over | 1.1% | 0.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Colts Neck, NJ | Rumson, NJ | United States |
| White | 86.8% | 92.8% | 59.4% |
| Black | 0.3% | 0.5% | 12.2% |
| Asian | 3.3% | 1.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.4% | 0.4% |
| Two or More Races | 3.4% | 1.5% | 3.2% |
| Hispanic | 6.2% | 3.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Colts Neck, NJ | Rumson, NJ | United States |
| Married Population | 68.4% | 65.9% | 49.8% |
| Currently Married | 67.4% | 64.9% | 48.0% |
| Married but Separated | 1.0% | 1.0% | 1.8% |
| Single Population | 31.6% | 34.1% | 50.2% |
| Never Married | 20.8% | 26.3% | 33.8% |
| Divorced | 8.5% | 5.3% | 10.8% |
| Widowed | 2.3% | 2.5% | 5.6% |
| space5 | | | |
| Household Size | 2.86 | 3.21 | 2.60 |
| Households | 3,469 | 2,265 | 124,010,992 |
| Family Households | 2,888 | 1,935 | 80,755,759 |
| Married couple, w/children | 35.4% | 46.9% | 30.5% |
| Married couple, no children | 55.4% | 43.1% | 42.9% |
| Non Family Households | 581 | 330 | 43,255,233 |
| Single householder, w/children | 5.5% | 4.7% | 15.8% |
| Single householder, no children | 3.7% | 5.3% | 10.8% |