| | Brady, TX | Gettysburg, SD | United States |
| Population | 5,129 | 1,464 | 329,725,481 |
| Female Population | 48.9% | 50.6% | 50.5% |
| Male Population | 51.1% | 49.5% | 49.5% |
| Median Age | 38.2 | 45 | 38.4 |
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| Population - 2010 | 5,503 | 1,186 | 309,327,143 |
| Population - 2000 | 5,523 | 1,352 | 285,036,114 |
| Population - 1990 | 5,946 | 1,510 | 251,960,433 |
| Pop. 2000 to Now | -6.3% | -19.8% | 15.6% |
| Pop. 1990 to Now | -12.9% | -28.2% | 30.8% |
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| Population Density | 585.6 | 762.1 | 93.4 |
| Land Area | 8.8 | 1.9 | 3,531,905.4 |
| Water Area | 2.5 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Brady, TX | Gettysburg, SD | United States |
| Age 0 to 4 | 6.4% | 4.2% | 5.9% |
| Age 5 to 9 | 7.5% | 8.8% | 6.1% |
| Age 10 to 14 | 5.1% | 4.4% | 6.6% |
| Age 15 to 17 | 4.7% | 5.7% | 3.9% |
| Age 18 to 20 | 2.1% | 2.9% | 4.0% |
| Age 21 to 24 | 6.4% | 5.4% | 5.2% |
| Age 25 to 34 | 15.0% | 9.3% | 13.8% |
| Age 35 to 44 | 8.1% | 9.4% | 12.9% |
| Age 45 to 54 | 12.5% | 8.4% | 12.6% |
| Age 55 to 59 | 4.8% | 6.8% | 6.7% |
| Age 60 to 64 | 7.2% | 8.0% | 6.3% |
| Age 65 to 74 | 11.5% | 11.3% | 9.6% |
| Age 75 to 84 | 5.2% | 11.0% | 4.5% |
| Age 85 and over | 3.5% | 4.6% | 1.9% |
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| Race | | | |
| | Brady, TX | Gettysburg, SD | United States |
| White | 51.8% | 86.9% | 59.4% |
| Black | 1.5% | 0.3% | 12.2% |
| Asian | 1.4% | 3.1% | 5.6% |
| Native American | 0.0% | 5.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 3.3% | 4.2% | 3.2% |
| Hispanic | 42.0% | 0.0% | 18.4% |
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| Marriage & Family | | | |
| | Brady, TX | Gettysburg, SD | United States |
| Married Population | 37.9% | 52.8% | 49.8% |
| Currently Married | 35.6% | 52.2% | 48.0% |
| Married but Separated | 2.4% | 0.6% | 1.8% |
| Single Population | 62.1% | 47.2% | 50.2% |
| Never Married | 33.3% | 26.0% | 33.8% |
| Divorced | 16.8% | 10.1% | 10.8% |
| Widowed | 12.0% | 11.1% | 5.6% |
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| Household Size | 2.44 | 2.30 | 2.60 |
| Households | 2,048 | 620 | 124,010,992 |
| Family Households | 1,249 | 353 | 80,755,759 |
| Married couple, w/children | 20.5% | 37.4% | 30.5% |
| Married couple, no children | 35.0% | 51.0% | 42.9% |
| Non Family Households | 799 | 267 | 43,255,233 |
| Single householder, w/children | 29.3% | 5.9% | 15.8% |
| Single householder, no children | 15.2% | 5.7% | 10.8% |