There are 1 US Post Offices in Culberson County serving a total of 2,336 residents equating to 2,336 residents per post office. It's estimated that approximately 3,729 packages are handled across the 1 county post offices annually. Culberson County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 2,398. The county seat is Van Horn. Culberson County was founded in 1911 and organized the next year. It is named for David B. Culberson, a lawyer and Confederate soldier in the American Civil War. Culberson County is in the Central Time Zone, however, northwestern Culberson County unofficially observes Mountain Time. It is one of the nine counties that comprise the Trans-Pecos region of West Texas."