| | Marion, AR | Keller, TX | United States |
| Population | 13,624 | 45,190 | 329,725,481 |
| Female Population | 49.0% | 49.8% | 50.5% |
| Male Population | 51.0% | 50.2% | 49.5% |
| Median Age | 34.8 | 42.9 | 38.4 |
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| Population - 2010 | 12,537 | 39,825 | 309,327,143 |
| Population - 2000 | 8,901 | 27,345 | 285,036,114 |
| Population - 1990 | 4,391 | 13,683 | 251,960,433 |
| Pop. 2000 to Now | 38.1% | 71.7% | 15.6% |
| Pop. 1990 to Now | 179.9% | 243.1% | 30.8% |
| space4 | | | |
| Population Density | 672.7 | 2,447.9 | 93.4 |
| Land Area | 20.3 | 18.5 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Marion, AR | Keller, TX | United States |
| Age 0 to 4 | 5.1% | 4.8% | 5.9% |
| Age 5 to 9 | 8.1% | 8.4% | 6.1% |
| Age 10 to 14 | 9.1% | 7.7% | 6.6% |
| Age 15 to 17 | 6.5% | 6.1% | 3.9% |
| Age 18 to 20 | 4.1% | 3.5% | 4.0% |
| Age 21 to 24 | 4.1% | 2.6% | 5.2% |
| Age 25 to 34 | 13.5% | 7.8% | 13.8% |
| Age 35 to 44 | 13.4% | 12.3% | 12.9% |
| Age 45 to 54 | 15.6% | 17.4% | 12.6% |
| Age 55 to 59 | 6.5% | 7.9% | 6.7% |
| Age 60 to 64 | 4.4% | 7.5% | 6.3% |
| Age 65 to 74 | 5.9% | 8.1% | 9.6% |
| Age 75 to 84 | 2.7% | 4.0% | 4.5% |
| Age 85 and over | 0.8% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Marion, AR | Keller, TX | United States |
| White | 53.0% | 79.0% | 59.4% |
| Black | 33.7% | 2.3% | 12.2% |
| Asian | 1.6% | 5.3% | 5.6% |
| Native American | 0.6% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 7.5% | 2.9% | 3.2% |
| Hispanic | 3.6% | 10.1% | 18.4% |
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| Marriage & Family | | | |
| | Marion, AR | Keller, TX | United States |
| Married Population | 51.3% | 67.8% | 49.8% |
| Currently Married | 49.6% | 66.9% | 48.0% |
| Married but Separated | 1.7% | 0.9% | 1.8% |
| Single Population | 48.7% | 32.2% | 50.2% |
| Never Married | 32.4% | 22.1% | 33.8% |
| Divorced | 11.7% | 6.8% | 10.8% |
| Widowed | 4.6% | 3.4% | 5.6% |
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| Household Size | 2.74 | 2.84 | 2.60 |
| Households | 4,940 | 15,852 | 124,010,992 |
| Family Households | 3,368 | 12,828 | 80,755,759 |
| Married couple, w/children | 40.6% | 43.0% | 30.5% |
| Married couple, no children | 33.5% | 46.0% | 42.9% |
| Non Family Households | 1,572 | 3,024 | 43,255,233 |
| Single householder, w/children | 18.2% | 7.0% | 15.8% |
| Single householder, no children | 7.7% | 4.0% | 10.8% |