Dunwoody will hold a special election July 20 to replace Tom Taylor, who resigned to run for the state House.
City Clerk Sharon Lowery said qualifying will be May 10-14 at city hall. Only voters in District 3 will cast ballots.
Mayor Ken Wright said the city council considered delaying the election until Sept. 21 or Nov. 2.
"The overall consensus was to not leave the seat vacant that long," Wright said.
Lowery said the DeKalb elections office won't charge the city much because the election will be held in conjunction with the General Primary. Numerous legislative seats will be voted on that day.