Carl Winfred Dorsey Jr. is an entertainment executive and Warren C. Head Jr. is a retiree.
The nine candidates all want to represent the sixth district, which includes unincorporated Fulton County, Chattahoochee Hills, Palmetto, Fairburn and Hapeville as well as parts of College Park, South Fulton, Union City, East Point and Atlanta.
Darnell had been a member of the county commission since 1992, winning eight terms to represent the south part of the county. She was known for her advocacy of vulnerable people, and a number of the candidates to replace her in her role seek to wear that mantle.
The election will be held Sept. 17, with a runoff scheduled Oct. 15.
The term runs through the end of 2020.