| | Mandeville, LA | New Orleans, LA | United States |
| Population | 12,985 | 383,974 | 329,725,481 |
| Female Population | 51.4% | 52.5% | 50.5% |
| Male Population | 48.7% | 47.5% | 49.5% |
| Median Age | 45.1 | 37.7 | 38.4 |
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| Population - 2010 | 12,137 | 347,789 | 309,327,143 |
| Population - 2000 | 10,489 | 484,674 | 285,036,114 |
| Population - 1990 | 7,083 | 496,938 | 251,960,433 |
| Pop. 2000 to Now | 19.7% | -19.6% | 15.6% |
| Pop. 1990 to Now | 77.3% | -21.6% | 30.8% |
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| Population Density | 1,870.0 | 2,266.3 | 93.4 |
| Land Area | 6.9 | 169.4 | 3,531,905.4 |
| Water Area | 0.1 | 180.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Mandeville, LA | New Orleans, LA | United States |
| Age 0 to 4 | 3.1% | 5.7% | 5.9% |
| Age 5 to 9 | 6.0% | 5.4% | 6.1% |
| Age 10 to 14 | 9.9% | 5.7% | 6.6% |
| Age 15 to 17 | 5.1% | 3.2% | 3.9% |
| Age 18 to 20 | 3.5% | 4.0% | 4.0% |
| Age 21 to 24 | 2.0% | 4.4% | 5.2% |
| Age 25 to 34 | 9.3% | 17.1% | 13.8% |
| Age 35 to 44 | 10.6% | 14.2% | 12.9% |
| Age 45 to 54 | 15.4% | 11.9% | 12.6% |
| Age 55 to 59 | 11.1% | 6.6% | 6.7% |
| Age 60 to 64 | 4.4% | 6.6% | 6.3% |
| Age 65 to 74 | 11.3% | 9.7% | 9.6% |
| Age 75 to 84 | 6.5% | 3.8% | 4.5% |
| Age 85 and over | 1.8% | 1.7% | 1.9% |
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| Race | | | |
| | Mandeville, LA | New Orleans, LA | United States |
| White | 92.5% | 30.6% | 59.4% |
| Black | 0.8% | 57.6% | 12.2% |
| Asian | 2.3% | 2.7% | 5.6% |
| Native American | 0.2% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.8% | 0.4% |
| Two or More Races | 1.0% | 2.6% | 3.2% |
| Hispanic | 3.3% | 5.6% | 18.4% |
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| Marriage & Family | | | |
| | Mandeville, LA | New Orleans, LA | United States |
| Married Population | 57.2% | 32.0% | 49.8% |
| Currently Married | 55.9% | 29.4% | 48.0% |
| Married but Separated | 1.3% | 2.6% | 1.8% |
| Single Population | 42.8% | 68.0% | 50.2% |
| Never Married | 23.7% | 49.7% | 33.8% |
| Divorced | 14.4% | 12.8% | 10.8% |
| Widowed | 4.7% | 5.5% | 5.6% |
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| Household Size | 2.43 | 2.37 | 2.60 |
| Households | 5,272 | 156,586 | 124,010,992 |
| Family Households | 3,495 | 71,845 | 80,755,759 |
| Married couple, w/children | 30.8% | 19.8% | 30.5% |
| Married couple, no children | 48.5% | 37.4% | 42.9% |
| Non Family Households | 1,777 | 84,741 | 43,255,233 |
| Single householder, w/children | 16.7% | 26.1% | 15.8% |
| Single householder, no children | 4.0% | 16.8% | 10.8% |