There are 4 US Post Offices in Knox County serving a total of 3,541 residents equating to 885 residents per post office. It's estimated that approximately 5,652 packages are handled across the 4 county post offices annually. Knox County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 3,719. Its county seat is Benjamin. The county was created in 1858 and later organized in 1886. It is named for Henry Knox, an American Revolutionary War general. The 1932 Texas Republican gubernatorial nominee, Orville Bullington, resided in Knox County and served as county attorney early in his career. Knox County is represented in the Texas House of Representatives by the Republican James Frank, a businessman from Wichita Falls."