There are 5 US Post Offices in Quitman County serving a total of 7,281 residents equating to 1,456 residents per post office. It's estimated that approximately 11,621 packages are handled across the 5 county post offices annually. Quitman County is a county located in the U.S. state of Mississippi. As of the 2010 census, the population was 8,223, making it the fifth-least populous county in Mississippi. Its county seat is Marks. The county is named after John A. Quitman, Governor of Mississippi from 1835 to 1836 and from 1850 to 1851. Quitman County is located in the Mississippi Delta region of Mississippi."