| | Round Top, TX | Fredericksburg, TX | United States |
| Population | 120 | 10,864 | 329,725,481 |
| Female Population | 48.3% | 53.8% | 50.5% |
| Male Population | 51.7% | 46.2% | 49.5% |
| Median Age | 59.2 | 51.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 91 | 10,561 | 309,327,143 |
| Population - 2000 | 77 | 8,911 | 285,036,114 |
| Population - 1990 | 81 | 6,934 | 251,960,433 |
| Pop. 2000 to Now | 20.8% | 29.3% | 15.6% |
| Pop. 1990 to Now | 14.8% | 66.1% | 30.8% |
| space4 | | | |
| Population Density | 125.8 | 1,255.5 | 93.4 |
| Land Area | 1.0 | 8.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Round Top, TX | Fredericksburg, TX | United States |
| Age 0 to 4 | 0.0% | 3.8% | 5.9% |
| Age 5 to 9 | 0.0% | 5.2% | 6.1% |
| Age 10 to 14 | 2.5% | 4.5% | 6.6% |
| Age 15 to 17 | 4.2% | 4.6% | 3.9% |
| Age 18 to 20 | 1.7% | 1.9% | 4.0% |
| Age 21 to 24 | 0.0% | 4.6% | 5.2% |
| Age 25 to 34 | 14.2% | 8.9% | 13.8% |
| Age 35 to 44 | 5.0% | 11.0% | 12.9% |
| Age 45 to 54 | 13.3% | 10.6% | 12.6% |
| Age 55 to 59 | 13.3% | 5.2% | 6.7% |
| Age 60 to 64 | 11.7% | 8.1% | 6.3% |
| Age 65 to 74 | 26.7% | 15.8% | 9.6% |
| Age 75 to 84 | 7.5% | 11.4% | 4.5% |
| Age 85 and over | 0.0% | 4.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Round Top, TX | Fredericksburg, TX | United States |
| White | 93.3% | 76.4% | 59.4% |
| Black | 0.0% | 0.2% | 12.2% |
| Asian | 0.0% | 0.5% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 4.2% | 1.2% | 3.2% |
| Hispanic | 2.5% | 21.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Round Top, TX | Fredericksburg, TX | United States |
| Married Population | 66.7% | 57.6% | 49.8% |
| Currently Married | 66.7% | 56.5% | 48.0% |
| Married but Separated | 0.0% | 1.1% | 1.8% |
| Single Population | 33.3% | 42.4% | 50.2% |
| Never Married | 19.7% | 21.5% | 33.8% |
| Divorced | 4.3% | 10.1% | 10.8% |
| Widowed | 9.4% | 10.9% | 5.6% |
| space5 | | | |
| Household Size | 2.31 | 2.08 | 2.60 |
| Households | 52 | 5,091 | 124,010,992 |
| Family Households | 38 | 2,973 | 80,755,759 |
| Married couple, w/children | 21.1% | 28.8% | 30.5% |
| Married couple, no children | 78.9% | 57.0% | 42.9% |
| Non Family Households | 14 | 2,118 | 43,255,233 |
| Single householder, w/children | 0.0% | 11.0% | 15.8% |
| Single householder, no children | 0.0% | 3.2% | 10.8% |