| | Bridgewater, NJ | Franklin township (Somerset County), NJ | United States |
| Population | 46,072 | 67,867 | 329,725,481 |
| Female Population | 52.5% | 51.5% | 50.5% |
| Male Population | 47.5% | 48.5% | 49.5% |
| Median Age | 43.6 | 40.4 | 38.4 |
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| Population - 2010 | 44,485 | 62,524 | 309,327,143 |
| Population - 2000 | 42,940 | 50,903 | 285,036,114 |
| Population - 1990 | 32,509 | 42,780 | 251,960,433 |
| Pop. 2000 to Now | 2.4% | 29.7% | 15.6% |
| Pop. 1990 to Now | 35.2% | 54.4% | 30.8% |
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| Population Density | 1,438.1 | 1,470.7 | 93.4 |
| Land Area | 32.0 | 46.1 | 3,531,905.4 |
| Water Area | 0.5 | 0.7 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Bridgewater, NJ | Franklin township (Somerset County), NJ | United States |
| Age 0 to 4 | 5.0% | 5.5% | 5.9% |
| Age 5 to 9 | 5.4% | 5.8% | 6.1% |
| Age 10 to 14 | 7.5% | 5.6% | 6.6% |
| Age 15 to 17 | 4.6% | 3.2% | 3.9% |
| Age 18 to 20 | 3.2% | 4.0% | 4.0% |
| Age 21 to 24 | 4.5% | 4.7% | 5.2% |
| Age 25 to 34 | 7.8% | 13.5% | 13.8% |
| Age 35 to 44 | 13.7% | 13.5% | 12.9% |
| Age 45 to 54 | 16.1% | 12.5% | 12.6% |
| Age 55 to 59 | 8.2% | 7.2% | 6.7% |
| Age 60 to 64 | 6.6% | 6.6% | 6.3% |
| Age 65 to 74 | 8.6% | 10.7% | 9.6% |
| Age 75 to 84 | 6.0% | 4.7% | 4.5% |
| Age 85 and over | 2.6% | 2.4% | 1.9% |
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| Race | | | |
| | Bridgewater, NJ | Franklin township (Somerset County), NJ | United States |
| White | 61.8% | 32.1% | 59.4% |
| Black | 2.0% | 26.3% | 12.2% |
| Asian | 24.8% | 23.3% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.2% | 0.4% |
| Two or More Races | 2.3% | 2.5% | 3.2% |
| Hispanic | 9.0% | 14.7% | 18.4% |
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| Marriage & Family | | | |
| | Bridgewater, NJ | Franklin township (Somerset County), NJ | United States |
| Married Population | 60.1% | 53.9% | 49.8% |
| Currently Married | 59.3% | 52.2% | 48.0% |
| Married but Separated | 0.8% | 1.8% | 1.8% |
| Single Population | 39.9% | 46.1% | 50.2% |
| Never Married | 26.0% | 32.7% | 33.8% |
| Divorced | 7.9% | 6.9% | 10.8% |
| Widowed | 6.1% | 6.5% | 5.6% |
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| Household Size | 2.82 | 2.63 | 2.60 |
| Households | 16,085 | 25,465 | 124,010,992 |
| Family Households | 12,184 | 17,032 | 80,755,759 |
| Married couple, w/children | 42.6% | 32.5% | 30.5% |
| Married couple, no children | 43.2% | 45.2% | 42.9% |
| Non Family Households | 3,901 | 8,433 | 43,255,233 |
| Single householder, w/children | 6.3% | 11.2% | 15.8% |
| Single householder, no children | 7.8% | 11.1% | 10.8% |