There are 9 US Post Offices in Wichita County serving a total of 104,649 residents equating to 11,628 residents per post office. It's estimated that approximately 167,031 packages are handled across the 9 county post offices annually. Wichita County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 131,500. The county seat is Wichita Falls. The county was created in 1858 and organized in 1882. Wichita County is part of the Wichita Falls, Texas, TX Metropolitan Statistical Area."