| | San Augustine, TX | Hemphill, TX | United States |
| Population | 1,821 | 1,411 | 329,725,481 |
| Female Population | 51.4% | 48.3% | 50.5% |
| Male Population | 48.6% | 51.7% | 49.5% |
| Median Age | 51.1 | 34.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,110 | 1,257 | 309,327,143 |
| Population - 2000 | 2,475 | 1,106 | 285,036,114 |
| Population - 1990 | 2,337 | 1,182 | 251,960,433 |
| Pop. 2000 to Now | -24.7% | 9.5% | 15.6% |
| Pop. 1990 to Now | -20.2% | 2.5% | 30.8% |
| space4 | | | |
| Population Density | 386.1 | 555.7 | 93.4 |
| Land Area | 4.7 | 2.5 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | San Augustine, TX | Hemphill, TX | United States |
| Age 0 to 4 | 3.1% | 14.1% | 5.9% |
| Age 5 to 9 | 4.6% | 6.1% | 6.1% |
| Age 10 to 14 | 7.7% | 7.6% | 6.6% |
| Age 15 to 17 | 1.0% | 2.7% | 3.9% |
| Age 18 to 20 | 2.0% | 2.9% | 4.0% |
| Age 21 to 24 | 4.9% | 4.9% | 5.2% |
| Age 25 to 34 | 8.8% | 11.9% | 13.8% |
| Age 35 to 44 | 5.7% | 14.2% | 12.9% |
| Age 45 to 54 | 20.2% | 8.4% | 12.6% |
| Age 55 to 59 | 10.7% | 6.9% | 6.7% |
| Age 60 to 64 | 2.6% | 8.7% | 6.3% |
| Age 65 to 74 | 15.3% | 4.6% | 9.6% |
| Age 75 to 84 | 8.3% | 3.5% | 4.5% |
| Age 85 and over | 5.3% | 3.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | San Augustine, TX | Hemphill, TX | United States |
| White | 35.7% | 74.4% | 59.4% |
| Black | 55.1% | 9.3% | 12.2% |
| Asian | 0.0% | 5.6% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.9% | 1.3% | 3.2% |
| Hispanic | 8.3% | 9.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | San Augustine, TX | Hemphill, TX | United States |
| Married Population | 44.8% | 50.1% | 49.8% |
| Currently Married | 41.2% | 49.6% | 48.0% |
| Married but Separated | 3.6% | 0.6% | 1.8% |
| Single Population | 55.2% | 49.9% | 50.2% |
| Never Married | 33.9% | 22.7% | 33.8% |
| Divorced | 12.8% | 17.4% | 10.8% |
| Widowed | 8.5% | 9.8% | 5.6% |
| space5 | | | |
| Household Size | 2.03 | 2.99 | 2.60 |
| Households | 840 | 448 | 124,010,992 |
| Family Households | 442 | 320 | 80,755,759 |
| Married couple, w/children | 14.7% | 37.5% | 30.5% |
| Married couple, no children | 35.3% | 29.1% | 42.9% |
| Non Family Households | 398 | 128 | 43,255,233 |
| Single householder, w/children | 28.3% | 17.2% | 15.8% |
| Single householder, no children | 21.7% | 16.3% | 10.8% |