| | Old Jefferson, LA | Inniswold, LA | United States |
| Population | 8,875 | 6,750 | 329,725,481 |
| Female Population | 48.5% | 48.9% | 50.5% |
| Male Population | 51.5% | 51.1% | 49.5% |
| Median Age | 36.2 | 38.2 | 38.4 |
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| Population - 2010 | 6,345 | 6,340 | 309,327,143 |
| Population - 2000 | 5,631 | 4,944 | 285,036,114 |
| Population - 1990 | 4,531 | 3,474 | 251,960,433 |
| Pop. 2000 to Now | 45.1% | 35.1% | 15.6% |
| Pop. 1990 to Now | 80.3% | 92.3% | 30.8% |
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| Population Density | 2,522.0 | 3,013.4 | 93.4 |
| Land Area | 3.5 | 2.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Old Jefferson, LA | Inniswold, LA | United States |
| Age 0 to 4 | 3.6% | 4.9% | 5.9% |
| Age 5 to 9 | 5.8% | 14.5% | 6.1% |
| Age 10 to 14 | 7.4% | 7.9% | 6.6% |
| Age 15 to 17 | 5.7% | 3.7% | 3.9% |
| Age 18 to 20 | 3.0% | 2.9% | 4.0% |
| Age 21 to 24 | 6.2% | 5.7% | 5.2% |
| Age 25 to 34 | 16.2% | 6.0% | 13.8% |
| Age 35 to 44 | 10.4% | 15.0% | 12.9% |
| Age 45 to 54 | 14.2% | 17.6% | 12.6% |
| Age 55 to 59 | 4.7% | 4.5% | 6.7% |
| Age 60 to 64 | 3.7% | 5.3% | 6.3% |
| Age 65 to 74 | 17.2% | 7.7% | 9.6% |
| Age 75 to 84 | 1.4% | 3.6% | 4.5% |
| Age 85 and over | 0.7% | 0.6% | 1.9% |
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| Race | | | |
| | Old Jefferson, LA | Inniswold, LA | United States |
| White | 62.5% | 63.6% | 59.4% |
| Black | 22.4% | 29.7% | 12.2% |
| Asian | 6.3% | 0.6% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.9% | 3.4% | 3.2% |
| Hispanic | 4.8% | 2.7% | 18.4% |
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| Marriage & Family | | | |
| | Old Jefferson, LA | Inniswold, LA | United States |
| Married Population | 39.2% | 51.8% | 49.8% |
| Currently Married | 37.4% | 51.5% | 48.0% |
| Married but Separated | 1.7% | 0.2% | 1.8% |
| Single Population | 60.8% | 48.2% | 50.2% |
| Never Married | 35.0% | 28.4% | 33.8% |
| Divorced | 20.5% | 16.4% | 10.8% |
| Widowed | 5.4% | 3.5% | 5.6% |
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| Household Size | 2.28 | 2.83 | 2.60 |
| Households | 3,881 | 2,380 | 124,010,992 |
| Family Households | 1,878 | 1,706 | 80,755,759 |
| Married couple, w/children | 35.1% | 34.3% | 30.5% |
| Married couple, no children | 35.9% | 37.0% | 42.9% |
| Non Family Households | 2,003 | 674 | 43,255,233 |
| Single householder, w/children | 15.9% | 27.3% | 15.8% |
| Single householder, no children | 13.0% | 1.3% | 10.8% |