| | Donna, TX | Walnut, CA | United States |
| Population | 16,743 | 28,641 | 329,725,481 |
| Female Population | 51.0% | 51.4% | 50.5% |
| Male Population | 49.0% | 48.6% | 49.5% |
| Median Age | 29.7 | 45.8 | 38.4 |
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| Population - 2010 | 15,781 | 29,222 | 309,327,143 |
| Population - 2000 | 14,768 | 30,004 | 285,036,114 |
| Population - 1990 | 12,652 | 29,105 | 251,960,433 |
| Pop. 2000 to Now | 10.5% | -2.3% | 15.6% |
| Pop. 1990 to Now | 29.0% | 0.8% | 30.8% |
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| Population Density | 2,019.2 | 3,185.2 | 93.4 |
| Land Area | 8.3 | 9.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Donna, TX | Walnut, CA | United States |
| Age 0 to 4 | 8.9% | 4.2% | 5.9% |
| Age 5 to 9 | 10.0% | 5.3% | 6.1% |
| Age 10 to 14 | 12.9% | 6.4% | 6.6% |
| Age 15 to 17 | 5.1% | 3.4% | 3.9% |
| Age 18 to 20 | 4.2% | 2.3% | 4.0% |
| Age 21 to 24 | 3.7% | 4.3% | 5.2% |
| Age 25 to 34 | 11.8% | 12.2% | 13.8% |
| Age 35 to 44 | 11.0% | 11.1% | 12.9% |
| Age 45 to 54 | 9.0% | 12.5% | 12.6% |
| Age 55 to 59 | 4.5% | 8.6% | 6.7% |
| Age 60 to 64 | 3.5% | 8.6% | 6.3% |
| Age 65 to 74 | 8.0% | 14.0% | 9.6% |
| Age 75 to 84 | 5.5% | 5.5% | 4.5% |
| Age 85 and over | 1.8% | 1.6% | 1.9% |
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| Race | | | |
| | Donna, TX | Walnut, CA | United States |
| White | 5.7% | 9.8% | 59.4% |
| Black | 0.0% | 3.1% | 12.2% |
| Asian | 0.0% | 65.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.6% | 0.2% |
| Other | 0.5% | 0.3% | 0.4% |
| Two or More Races | 0.3% | 2.6% | 3.2% |
| Hispanic | 93.6% | 18.5% | 18.4% |
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| Marriage & Family | | | |
| | Donna, TX | Walnut, CA | United States |
| Married Population | 49.4% | 60.2% | 49.8% |
| Currently Married | 43.8% | 59.0% | 48.0% |
| Married but Separated | 5.6% | 1.2% | 1.8% |
| Single Population | 50.6% | 39.8% | 50.2% |
| Never Married | 33.1% | 29.5% | 33.8% |
| Divorced | 8.7% | 5.4% | 10.8% |
| Widowed | 8.8% | 4.9% | 5.6% |
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| Household Size | 3.29 | 3.30 | 2.60 |
| Households | 5,081 | 8,663 | 124,010,992 |
| Family Households | 3,632 | 7,546 | 80,755,759 |
| Married couple, w/children | 28.0% | 27.8% | 30.5% |
| Married couple, no children | 30.3% | 51.7% | 42.9% |
| Non Family Households | 1,449 | 1,117 | 43,255,233 |
| Single householder, w/children | 29.8% | 8.9% | 15.8% |
| Single householder, no children | 11.9% | 11.6% | 10.8% |