| | Selma, TX | Boerne, TX | United States |
| Population | 10,601 | 17,290 | 329,725,481 |
| Female Population | 50.8% | 50.0% | 50.5% |
| Male Population | 49.2% | 50.1% | 49.5% |
| Median Age | 33 | 37.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,655 | 10,666 | 309,327,143 |
| Population - 2000 | 788 | 6,178 | 285,036,114 |
| Population - 1990 | 520 | 4,274 | 251,960,433 |
| Pop. 2000 to Now | 1,566.2% | 208.6% | 15.6% |
| Pop. 1990 to Now | 2,425.0% | 346.1% | 30.8% |
| space4 | | | |
| Population Density | 2,098.8 | 1,530.0 | 93.4 |
| Land Area | 5.1 | 11.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Selma, TX | Boerne, TX | United States |
| Age 0 to 4 | 9.5% | 6.1% | 5.9% |
| Age 5 to 9 | 8.3% | 7.7% | 6.1% |
| Age 10 to 14 | 4.8% | 9.3% | 6.6% |
| Age 15 to 17 | 4.0% | 4.0% | 3.9% |
| Age 18 to 20 | 4.0% | 4.1% | 4.0% |
| Age 21 to 24 | 4.2% | 3.5% | 5.2% |
| Age 25 to 34 | 17.6% | 11.7% | 13.8% |
| Age 35 to 44 | 18.8% | 14.6% | 12.9% |
| Age 45 to 54 | 10.5% | 12.1% | 12.6% |
| Age 55 to 59 | 7.6% | 6.7% | 6.7% |
| Age 60 to 64 | 2.7% | 3.2% | 6.3% |
| Age 65 to 74 | 5.7% | 7.6% | 9.6% |
| Age 75 to 84 | 2.2% | 6.0% | 4.5% |
| Age 85 and over | 0.0% | 3.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Selma, TX | Boerne, TX | United States |
| White | 33.5% | 64.6% | 59.4% |
| Black | 24.0% | 0.4% | 12.2% |
| Asian | 7.6% | 0.4% | 5.6% |
| Native American | 0.4% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.8% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 6.3% | 4.2% | 3.2% |
| Hispanic | 28.2% | 29.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Selma, TX | Boerne, TX | United States |
| Married Population | 56.2% | 57.5% | 49.8% |
| Currently Married | 52.5% | 56.9% | 48.0% |
| Married but Separated | 3.7% | 0.5% | 1.8% |
| Single Population | 43.8% | 42.5% | 50.2% |
| Never Married | 32.0% | 25.2% | 33.8% |
| Divorced | 7.8% | 11.4% | 10.8% |
| Widowed | 4.1% | 5.9% | 5.6% |
| space5 | | | |
| Household Size | 2.75 | 2.66 | 2.60 |
| Households | 3,844 | 6,357 | 124,010,992 |
| Family Households | 2,856 | 4,490 | 80,755,759 |
| Married couple, w/children | 40.0% | 39.2% | 30.5% |
| Married couple, no children | 32.2% | 42.0% | 42.9% |
| Non Family Households | 988 | 1,867 | 43,255,233 |
| Single householder, w/children | 20.5% | 14.8% | 15.8% |
| Single householder, no children | 7.2% | 4.0% | 10.8% |