There are 5 US Post Offices in Chickasaw County serving a total of 18,886 residents equating to 3,777 residents per post office. It's estimated that approximately 30,144 packages are handled across the 5 county post offices annually. Chickasaw County is a county located in the U.S. state of Mississippi. As of the 2010 census, the population was 17,392. Its county seats are Houston and Okolona. The county is named for the Chickasaw people, who lived in this area for hundreds of years. Most were removed to Indian Territory in the 1830s, but some remained and became citizens of the state and United States. Early in the 20th century, the first agricultural high school in Mississippi opened in the unincorporated community of Buena Vista. Cully Cobb, a pioneer of southern agriculture, long-term farm publisher, and an official of the Agricultural Adjustment Administration in Washington, D.C., was the superintendent of the school from 1908-1910."