Hemphill is a city in Sabine County, Texas, United States. The population was 1,106 at the 2000 census. It is the county seat of Sabine County. It is located on State Highway 87 at the junction of State Highway 184, and is surrounded by the Sabine National Forest and the Toledo Bend Reservoir.
Hemphill is located at 31°20′33″N 93°51′18″W / 31.3425°N 93.855°W / 31.3425; -93.855 (31.342612, -93.854909).
According to the United States Census Bureau, the city has a total area of 2.4 square miles (6.2 km²), of which, 2.4 square miles (6.2 km²) of it is land and 0.04 square miles (0.1 km²) of it (1.66%) is water.