| | Shenandoah, TX | Shenandoah, LA | United States |
| Population | 3,350 | 20,068 | 329,725,481 |
| Female Population | 61.4% | 54.1% | 50.5% |
| Male Population | 38.6% | 45.9% | 49.5% |
| Median Age | 60.6 | 39.2 | 38.4 |
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| Population - 2010 | 2,152 | 18,297 | 309,327,143 |
| Population - 2000 | 1,503 | 17,070 | 285,036,114 |
| Population - 1990 | 1,718 | 13,429 | 251,960,433 |
| Pop. 2000 to Now | 106.3% | 18.4% | 15.6% |
| Pop. 1990 to Now | 80.5% | 50.4% | 30.8% |
| space4 | | | |
| Population Density | 1,716.2 | 3,237.8 | 93.4 |
| Land Area | 2.0 | 6.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Shenandoah, TX | Shenandoah, LA | United States |
| Age 0 to 4 | 1.3% | 6.0% | 5.9% |
| Age 5 to 9 | 3.6% | 9.1% | 6.1% |
| Age 10 to 14 | 2.7% | 6.3% | 6.6% |
| Age 15 to 17 | 1.1% | 3.5% | 3.9% |
| Age 18 to 20 | 0.0% | 3.6% | 4.0% |
| Age 21 to 24 | 0.8% | 3.0% | 5.2% |
| Age 25 to 34 | 5.9% | 13.3% | 13.8% |
| Age 35 to 44 | 9.0% | 12.3% | 12.9% |
| Age 45 to 54 | 13.0% | 12.3% | 12.6% |
| Age 55 to 59 | 4.7% | 7.9% | 6.7% |
| Age 60 to 64 | 18.7% | 7.3% | 6.3% |
| Age 65 to 74 | 23.7% | 10.1% | 9.6% |
| Age 75 to 84 | 12.2% | 4.8% | 4.5% |
| Age 85 and over | 3.5% | 0.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Shenandoah, TX | Shenandoah, LA | United States |
| White | 85.7% | 65.4% | 59.4% |
| Black | 0.0% | 19.4% | 12.2% |
| Asian | 3.5% | 3.0% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.7% | 9.7% | 3.2% |
| Hispanic | 10.0% | 2.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Shenandoah, TX | Shenandoah, LA | United States |
| Married Population | 68.4% | 61.9% | 49.8% |
| Currently Married | 66.5% | 60.4% | 48.0% |
| Married but Separated | 1.9% | 1.4% | 1.8% |
| Single Population | 31.6% | 38.1% | 50.2% |
| Never Married | 5.1% | 24.8% | 33.8% |
| Divorced | 11.8% | 8.1% | 10.8% |
| Widowed | 14.6% | 5.2% | 5.6% |
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| Household Size | 1.85 | 2.73 | 2.60 |
| Households | 1,810 | 7,334 | 124,010,992 |
| Family Households | 1,119 | 5,476 | 80,755,759 |
| Married couple, w/children | 22.0% | 26.7% | 30.5% |
| Married couple, no children | 70.8% | 56.5% | 42.9% |
| Non Family Households | 691 | 1,858 | 43,255,233 |
| Single householder, w/children | 0.0% | 10.0% | 15.8% |
| Single householder, no children | 7.2% | 6.9% | 10.8% |