Yellville is a city in and county seat of Marion County, Arkansas, United States. Yellville is located in the Ozark Mountains along the banks of …Yellville is a city in and county seat of Marion County, Arkansas, United States. Yellville is located in the Ozark Mountains along the banks of Crooked Creek, and neighbors the small town of Summit to the north. The population was 1,178 at the 2020 census. The town's original name is preserved in the Shawnee Town Branch, a local creek. The town holds an annual Turkey Trot Festival.