| | Harper, TX | Bandera, TX | United States |
| Population | 1,203 | 453 | 329,725,481 |
| Female Population | 49.4% | 55.4% | 50.5% |
| Male Population | 50.6% | 44.6% | 49.5% |
| Median Age | 34.4 | 53.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,042 | 851 | 309,327,143 |
| Population - 2000 | 1,006 | 957 | 285,036,114 |
| Population - 1990 | 637 | 877 | 251,960,433 |
| Pop. 2000 to Now | -3.5% | -5.2% | 15.6% |
| Pop. 1990 to Now | 52.4% | 3.4% | 30.8% |
| space4 | | | |
| Population Density | 21.3 | 381.3 | 93.4 |
| Land Area | 56.6 | 1.2 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Harper, TX | Bandera, TX | United States |
| Age 0 to 4 | 3.0% | 6.6% | 5.9% |
| Age 5 to 9 | 12.9% | 1.3% | 6.1% |
| Age 10 to 14 | 11.3% | 0.4% | 6.6% |
| Age 15 to 17 | 4.7% | 0.0% | 3.9% |
| Age 18 to 20 | 3.8% | 3.8% | 4.0% |
| Age 21 to 24 | 0.7% | 5.1% | 5.2% |
| Age 25 to 34 | 15.8% | 10.2% | 13.8% |
| Age 35 to 44 | 9.1% | 13.9% | 12.9% |
| Age 45 to 54 | 6.9% | 9.5% | 12.6% |
| Age 55 to 59 | 8.0% | 13.0% | 6.7% |
| Age 60 to 64 | 9.1% | 2.9% | 6.3% |
| Age 65 to 74 | 7.8% | 18.5% | 9.6% |
| Age 75 to 84 | 2.1% | 12.1% | 4.5% |
| Age 85 and over | 4.8% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Harper, TX | Bandera, TX | United States |
| White | 85.5% | 81.9% | 59.4% |
| Black | 0.0% | 0.9% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.5% | 0.2% | 3.2% |
| Hispanic | 14.0% | 16.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Harper, TX | Bandera, TX | United States |
| Married Population | 63.6% | 37.6% | 49.8% |
| Currently Married | 62.3% | 34.7% | 48.0% |
| Married but Separated | 1.3% | 2.9% | 1.8% |
| Single Population | 36.4% | 62.4% | 50.2% |
| Never Married | 23.4% | 33.5% | 33.8% |
| Divorced | 3.7% | 16.1% | 10.8% |
| Widowed | 9.4% | 12.8% | 5.6% |
| space5 | | | |
| Household Size | 2.84 | 2.46 | 2.60 |
| Households | 424 | 170 | 124,010,992 |
| Family Households | 317 | 74 | 80,755,759 |
| Married couple, w/children | 45.1% | 6.8% | 30.5% |
| Married couple, no children | 36.9% | 44.6% | 42.9% |
| Non Family Households | 107 | 96 | 43,255,233 |
| Single householder, w/children | 12.3% | 18.9% | 15.8% |
| Single householder, no children | 5.7% | 29.7% | 10.8% |