| | Lindenhurst, NY | Rockaway township, NJ | United States |
| Population | 27,169 | 25,370 | 329,725,481 |
| Female Population | 49.4% | 48.8% | 50.5% |
| Male Population | 50.6% | 51.2% | 49.5% |
| Median Age | 40.1 | 42.8 | 38.4 |
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| Population - 2010 | 27,283 | 24,149 | 309,327,143 |
| Population - 2000 | 27,819 | 22,930 | 285,036,114 |
| Population - 1990 | 26,879 | 19,572 | 251,960,433 |
| Pop. 2000 to Now | -3.9% | 13.6% | 15.6% |
| Pop. 1990 to Now | -0.6% | 33.1% | 30.8% |
| space4 | | | |
| Population Density | 7,241.2 | 609.2 | 93.4 |
| Land Area | 3.8 | 41.6 | 3,531,905.4 |
| Water Area | 0.1 | 4.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lindenhurst, NY | Rockaway township, NJ | United States |
| Age 0 to 4 | 5.5% | 4.9% | 5.9% |
| Age 5 to 9 | 5.0% | 5.8% | 6.1% |
| Age 10 to 14 | 6.5% | 6.3% | 6.6% |
| Age 15 to 17 | 4.3% | 4.4% | 3.9% |
| Age 18 to 20 | 4.0% | 4.0% | 4.0% |
| Age 21 to 24 | 5.4% | 4.5% | 5.2% |
| Age 25 to 34 | 13.3% | 10.8% | 13.8% |
| Age 35 to 44 | 11.4% | 12.3% | 12.9% |
| Age 45 to 54 | 14.7% | 16.4% | 12.6% |
| Age 55 to 59 | 8.0% | 6.6% | 6.7% |
| Age 60 to 64 | 7.5% | 7.3% | 6.3% |
| Age 65 to 74 | 8.7% | 10.2% | 9.6% |
| Age 75 to 84 | 3.9% | 4.8% | 4.5% |
| Age 85 and over | 1.8% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lindenhurst, NY | Rockaway township, NJ | United States |
| White | 74.8% | 74.3% | 59.4% |
| Black | 3.2% | 2.9% | 12.2% |
| Asian | 2.1% | 5.8% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.6% | 0.4% |
| Two or More Races | 1.5% | 2.4% | 3.2% |
| Hispanic | 18.4% | 14.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lindenhurst, NY | Rockaway township, NJ | United States |
| Married Population | 52.0% | 57.8% | 49.8% |
| Currently Married | 50.1% | 57.2% | 48.0% |
| Married but Separated | 1.9% | 0.6% | 1.8% |
| Single Population | 48.0% | 42.2% | 50.2% |
| Never Married | 33.7% | 28.7% | 33.8% |
| Divorced | 8.3% | 8.6% | 10.8% |
| Widowed | 6.1% | 4.9% | 5.6% |
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| Household Size | 3.19 | 2.85 | 2.60 |
| Households | 8,514 | 8,909 | 124,010,992 |
| Family Households | 6,335 | 6,518 | 80,755,759 |
| Married couple, w/children | 35.7% | 38.6% | 30.5% |
| Married couple, no children | 40.3% | 46.9% | 42.9% |
| Non Family Households | 2,179 | 2,391 | 43,255,233 |
| Single householder, w/children | 9.9% | 5.8% | 15.8% |
| Single householder, no children | 14.0% | 8.7% | 10.8% |