There are 13 US Post Offices in Bryan County serving a total of 43,353 residents equating to 3,335 residents per post office. It's estimated that approximately 69,196 packages are handled across the 13 county post offices annually. Bryan County is a county located in the U.S. state of Oklahoma.As of the 2010 census, the population was 42,416. Its county seat is Durant. It is the only county in the United States named for Populist politician William Jennings Bryan. Bryan County comprises the Durant, OK Micropolitan Statistical Area, which is included in the Dallas-Fort Worth and the Texoma region, TX-OK Combined Statistical Area. It is home to the headquarters of the Choctaw Nation of Oklahoma located in Durant. Bryan County consists of 10 Townships: Albany, Bennington, Bokchito, Brown, Caddo, Calera, Colbert, Kemp, Matoy, and Speairs Townships.