| | Hamilton township (Mercer County), NJ | Barnegat township, NJ | United States |
| Population | 91,557 | 23,894 | 329,725,481 |
| Female Population | 50.3% | 51.5% | 50.5% |
| Male Population | 49.7% | 48.5% | 49.5% |
| Median Age | 41.8 | 50.5 | 38.4 |
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| Population - 2010 | 88,512 | 21,047 | 309,327,143 |
| Population - 2000 | 87,109 | 15,270 | 285,036,114 |
| Population - 1990 | 86,553 | 12,235 | 251,960,433 |
| Pop. 2000 to Now | -0.4% | 57.1% | 15.6% |
| Pop. 1990 to Now | 0.2% | 96.1% | 30.8% |
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| Population Density | 2,318.0 | 695.1 | 93.4 |
| Land Area | 39.5 | 34.4 | 3,531,905.4 |
| Water Area | 0.9 | 6.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Hamilton township (Mercer County), NJ | Barnegat township, NJ | United States |
| Age 0 to 4 | 5.6% | 3.7% | 5.9% |
| Age 5 to 9 | 4.6% | 3.9% | 6.1% |
| Age 10 to 14 | 4.2% | 5.5% | 6.6% |
| Age 15 to 17 | 3.6% | 4.8% | 3.9% |
| Age 18 to 20 | 3.2% | 2.6% | 4.0% |
| Age 21 to 24 | 5.2% | 4.3% | 5.2% |
| Age 25 to 34 | 14.3% | 9.9% | 13.8% |
| Age 35 to 44 | 12.7% | 9.2% | 12.9% |
| Age 45 to 54 | 13.0% | 11.8% | 12.6% |
| Age 55 to 59 | 7.1% | 7.0% | 6.7% |
| Age 60 to 64 | 7.3% | 8.8% | 6.3% |
| Age 65 to 74 | 10.9% | 12.7% | 9.6% |
| Age 75 to 84 | 6.0% | 12.8% | 4.5% |
| Age 85 and over | 2.3% | 3.1% | 1.9% |
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| Race | | | |
| | Hamilton township (Mercer County), NJ | Barnegat township, NJ | United States |
| White | 63.7% | 86.3% | 59.4% |
| Black | 12.5% | 3.8% | 12.2% |
| Asian | 5.0% | 1.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.1% | 0.2% |
| Other | 0.1% | 0.3% | 0.4% |
| Two or More Races | 1.5% | 2.0% | 3.2% |
| Hispanic | 17.2% | 6.3% | 18.4% |
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| Marriage & Family | | | |
| | Hamilton township (Mercer County), NJ | Barnegat township, NJ | United States |
| Married Population | 51.2% | 58.7% | 49.8% |
| Currently Married | 48.9% | 57.6% | 48.0% |
| Married but Separated | 2.3% | 1.1% | 1.8% |
| Single Population | 48.8% | 41.3% | 50.2% |
| Never Married | 33.6% | 25.7% | 33.8% |
| Divorced | 9.2% | 8.0% | 10.8% |
| Widowed | 6.0% | 7.6% | 5.6% |
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| Household Size | 2.62 | 2.52 | 2.60 |
| Households | 34,682 | 9,458 | 124,010,992 |
| Family Households | 23,678 | 7,116 | 80,755,759 |
| Married couple, w/children | 27.3% | 23.2% | 30.5% |
| Married couple, no children | 45.9% | 57.6% | 42.9% |
| Non Family Households | 11,004 | 2,342 | 43,255,233 |
| Single householder, w/children | 13.0% | 11.3% | 15.8% |
| Single householder, no children | 13.9% | 7.9% | 10.8% |