Tiawah is a census-designated place (CDP) in Rogers County, Oklahoma, United States. As of the 2020 census, Tiawah had a population of 235. It was built on the St. Louis, Iron Mountain, & Southern Railway line running from Coffeyville, Kansas, to Fort Smith, Arkansas. The post office existed from August 24, 1903, until December 31, 1938. It is said to be named for Tiawah Mound in Georgia.