There are 12 US Post Offices in Texas County serving a total of 24,506 residents equating to 2,042 residents per post office. It's estimated that approximately 39,114 packages are handled across the 12 county post offices annually. Texas County is a county located in the southern portion of the U.S. state of Missouri. As of the 2010 census, the population was 26,008. Its county seat is Houston. The county was organized in 1843 as Ashley County, changing its name in 1845 to Texas, after the Republic of Texas. The 2010 U.S. Census indicates that it is the center of population for the United States."