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.
Dr. John Williamson is an urologist in Austin, Texas and is affiliated with multiple hospitals in the area, including Scott and White Hospital-Llano and Seton Highland Lakes. He received his medical degree from University of Texas Medical School and has been in practice for more than 20 years. He is one of 2 doctors at Scott and White Hospital-Llano and one of 3 at Seton Highland Lakes who specialize in Urology. Quick Stats (512) 443-5988 Phone Number