| | Spotswood, NJ | Columbia, NJ | United States |
| Population | 8,163 | 204 | 329,725,481 |
| Female Population | 53.9% | 53.4% | 50.5% |
| Male Population | 46.1% | 46.6% | 49.5% |
| Median Age | 44.7 | 55.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 8,257 | 279 | 309,327,143 |
| Population - 2000 | 7,880 | 202 | 285,036,114 |
| Population - 1990 | 7,983 | 161 | 251,960,433 |
| Pop. 2000 to Now | 3.7% | 79.7% | 15.6% |
| Pop. 1990 to Now | 2.3% | 125.5% | 30.8% |
| space4 | | | |
| Population Density | 3,538.4 | 2,040.0 | 93.4 |
| Land Area | 2.3 | 0.1 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Spotswood, NJ | Columbia, NJ | United States |
| Age 0 to 4 | 7.8% | 2.9% | 5.9% |
| Age 5 to 9 | 4.0% | 2.9% | 6.1% |
| Age 10 to 14 | 4.7% | 0.0% | 6.6% |
| Age 15 to 17 | 2.5% | 2.5% | 3.9% |
| Age 18 to 20 | 1.3% | 0.0% | 4.0% |
| Age 21 to 24 | 5.9% | 0.0% | 5.2% |
| Age 25 to 34 | 10.4% | 9.8% | 13.8% |
| Age 35 to 44 | 13.7% | 7.4% | 12.9% |
| Age 45 to 54 | 10.4% | 23.0% | 12.6% |
| Age 55 to 59 | 10.2% | 27.0% | 6.7% |
| Age 60 to 64 | 7.8% | 15.2% | 6.3% |
| Age 65 to 74 | 12.8% | 0.0% | 9.6% |
| Age 75 to 84 | 4.9% | 2.9% | 4.5% |
| Age 85 and over | 3.6% | 6.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Spotswood, NJ | Columbia, NJ | United States |
| White | 77.9% | 93.6% | 59.4% |
| Black | 2.9% | 3.4% | 12.2% |
| Asian | 6.3% | 0.0% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 2.7% | 0.0% | 3.2% |
| Hispanic | 9.7% | 2.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Spotswood, NJ | Columbia, NJ | United States |
| Married Population | 56.4% | 46.4% | 49.8% |
| Currently Married | 55.7% | 46.4% | 48.0% |
| Married but Separated | 0.7% | 0.0% | 1.8% |
| Single Population | 43.6% | 53.6% | 50.2% |
| Never Married | 24.9% | 12.5% | 33.8% |
| Divorced | 9.6% | 27.1% | 10.8% |
| Widowed | 9.1% | 14.1% | 5.6% |
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| Household Size | 2.60 | 2.23 | 2.60 |
| Households | 3,131 | 77 | 124,010,992 |
| Family Households | 2,269 | 50 | 80,755,759 |
| Married couple, w/children | 29.2% | 10.0% | 30.5% |
| Married couple, no children | 48.6% | 78.0% | 42.9% |
| Non Family Households | 862 | 27 | 43,255,233 |
| Single householder, w/children | 9.0% | 12.0% | 15.8% |
| Single householder, no children | 13.1% | 0.0% | 10.8% |