There are 4 US Post Offices in Randall County serving a total of 64,109 residents equating to 16,027 residents per post office. It's estimated that approximately 102,325 packages are handled across the 4 county post offices annually. Randall County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 120,725. Its county seat is Canyon. The county was created in 1876 and later organized in 1889. It is named for Horace Randal, a Confederate brigadier general killed at the Battle of Jenkins Ferry. The reason the county name differs from his is because the bill creating the county misspelled Randal's name. Randall County is part of the Amarillo, TX Metropolitan Statistical Area. At one time, the large JA Ranch, founded by Charles Goodnight and John George Adair, which reached into six counties, held acreage in Randall County."