There are 7 US Post Offices in Texas County serving a total of 20,500 residents equating to 2,929 residents per post office. It's estimated that approximately 32,720 packages are handled across the 7 county post offices annually. Texas County is a county located in the panhandle of the U.S. state of Oklahoma. Its county seat is Guymon. As of the 2010 census, the population was 20,640. It is the second-largest county in the state, based on land area, and is named for Texas, the state that adjoins the county to its south. Texas County comprises the Guymon, OK Micropolitan Statistical Area. The county economy is largely based on farming and cattle production. It is one of the top producing counties in the U.S. for wheat, cattle and hogs. It also lies within the noted Hugoton-Panhandle natural gas field."