Russellville is the county seat and largest city in Pope County, Arkansas, United States, with a population of 27,920, according to the 2010 Census. It is home to Arkansas Tech University and Arkansas Nuclear One, Arkansas' only nuclear power plant. Russellville borders Lake Dardanelle and the Arkansas River.It is the principal city of the Russellville Micropolitan Statistical Area, which includes all of Pope and Yell counties.