Johnston County, Oklahoma. Johnston County is a county located in the U.S. state of Oklahoma. As of the 2010 census, the population was 10,957. Its county seat is Tishomingo. It was established at statehood on November 16, 1907 and named for Douglas H. Johnston, a governor of the Chickasaw Nation. Johnston County is part of the Texoma Region.
Texas Health Physicians Group is a group practice with 219 locations. Currently, Texas Health Physicians Group's 720 physicians cover 56 specialty areas of medicine.
It is a component of the University of Texas System. The UT Health Science Center is the largest health sciences university in South Texas. The Health Science Center serves San Antonio and all of the 50,000 square miles (130,000 km 2) area of Central and South Texas. It extends to campuses in the Texas border communities of Laredo and the Lower Rio Grande Valley.