Founded in 1887, Jeff Davis County is one of 254 counties in the state of Texas. Historically, Jeff Davis County was formed from Presidio County. The city of Fort Davis is the county seat. With FIPS code of 243, Jeff Davis County has a population of 1,949 and area of 2,265 square miles (5,866 km2).
List of all cities in Jeff Davis County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Fort Davis, TX | 79734 | 432 |
| Mcdonald Observatory, TX | 79734 | 432 |