Hudspeth County is the second most western county in Texas and one of only two to observe the Mountain Time Zone. The county has a population of approximately 3,400 spread over a total area of 4,572 square miles, making it the third largest county in Texas. 0.8 square miles of the county consists of water and the remainder is land. The county is named after Claude Benton Hudspeth, a state senator and United States Representative from El Paso. Hudspeth County also borders Mexico to the south.
The county seat is Sierra Blanca, which has a population of approximately 550. The largest settlement in the county is Fort Hancock, population at approximately 1,700 as at the 2000 census. Fort Hancock is a footbridge from Mexico.