Dardanelle is a city in northeast Yell County, Arkansas, United States. The population was 4,517 at the 2020 census. Along with Danville, it serv…Dardanelle is a city in northeast Yell County, Arkansas, United States. The population was 4,517 at the 2020 census. Along with Danville, it serves as a county seat for Yell County. It is located near Lake Dardanelle.