| Place Name | Marathon |
| Place Type | Census Designated Place |
| ZIP Code(s) | 79842 |
| County | Brewster County |
| Area Code(s) | 432 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 493 |
| Population Growth Rate (2010-19) | -4.65% |
| Majority Ethnicity | White 68.11% |
| US Congressional District(s) | Texas 23rd |
| State House Districts | 74 |
| State Senate Districts | 19 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 68.11% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 31.89% |