| | Port Allen, LA | New Roads, LA | United States |
| Population | 4,989 | 4,516 | 329,725,481 |
| Female Population | 56.7% | 48.3% | 50.5% |
| Male Population | 43.3% | 51.7% | 49.5% |
| Median Age | 42.6 | 42.8 | 38.4 |
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| Population - 2010 | 5,185 | 4,809 | 309,327,143 |
| Population - 2000 | 5,278 | 4,966 | 285,036,114 |
| Population - 1990 | 6,277 | 5,303 | 251,960,433 |
| Pop. 2000 to Now | -10.6% | -11.2% | 15.6% |
| Pop. 1990 to Now | -24.8% | -16.9% | 30.8% |
| space4 | | | |
| Population Density | 1,759.8 | 985.6 | 93.4 |
| Land Area | 2.8 | 4.6 | 3,531,905.4 |
| Water Area | 0.5 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Port Allen, LA | New Roads, LA | United States |
| Age 0 to 4 | 5.1% | 3.0% | 5.9% |
| Age 5 to 9 | 7.1% | 7.2% | 6.1% |
| Age 10 to 14 | 6.1% | 10.2% | 6.6% |
| Age 15 to 17 | 3.3% | 0.8% | 3.9% |
| Age 18 to 20 | 2.7% | 1.6% | 4.0% |
| Age 21 to 24 | 3.1% | 4.5% | 5.2% |
| Age 25 to 34 | 10.5% | 14.2% | 13.8% |
| Age 35 to 44 | 14.7% | 9.8% | 12.9% |
| Age 45 to 54 | 12.5% | 10.2% | 12.6% |
| Age 55 to 59 | 5.0% | 6.6% | 6.7% |
| Age 60 to 64 | 7.1% | 9.5% | 6.3% |
| Age 65 to 74 | 10.9% | 13.6% | 9.6% |
| Age 75 to 84 | 7.1% | 5.4% | 4.5% |
| Age 85 and over | 4.8% | 3.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Port Allen, LA | New Roads, LA | United States |
| White | 40.7% | 40.5% | 59.4% |
| Black | 57.2% | 57.0% | 12.2% |
| Asian | 0.0% | 1.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 1.1% | 3.2% |
| Hispanic | 2.1% | 0.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Port Allen, LA | New Roads, LA | United States |
| Married Population | 35.7% | 38.0% | 49.8% |
| Currently Married | 34.7% | 31.5% | 48.0% |
| Married but Separated | 1.0% | 6.6% | 1.8% |
| Single Population | 64.3% | 62.0% | 50.2% |
| Never Married | 41.2% | 37.6% | 33.8% |
| Divorced | 14.5% | 13.5% | 10.8% |
| Widowed | 8.6% | 10.9% | 5.6% |
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| Household Size | 2.46 | 2.55 | 2.60 |
| Households | 1,974 | 1,728 | 124,010,992 |
| Family Households | 1,264 | 833 | 80,755,759 |
| Married couple, w/children | 17.0% | 11.0% | 30.5% |
| Married couple, no children | 38.1% | 50.1% | 42.9% |
| Non Family Households | 710 | 895 | 43,255,233 |
| Single householder, w/children | 29.0% | 13.3% | 15.8% |
| Single householder, no children | 15.8% | 25.6% | 10.8% |