Seeking re-election are Republicans Mayor Fred Cavanaugh, City Council member Don Sprawls, representing District 3, and Democrat City Council member Beverly Clyburn, representing District 1.
Four years ago, all three ran unopposed in the general election.
At present, Mr. Cavanaugh is running uncontested. But that could change within about five weeks.
David Allen, an independent, is trying to collect enough petition signatures to get his candidacy for mayor placed on the November ballot.
He has until Sept. 21 to collect 931 signatures.
If he succeeds, Mr. Allen and Mr. Cavanaugh will square off in the Nov. 6 general elections. If not, Mr. Cavanaugh will begin his fifth term as mayor without going through an election.
"There's no doubt how I feel about Aiken," he said, having been on the city council for 21 years before he first ran for mayor. "I still have the same desire and hopes for the future."
Ms. Clyburn is seeking a seventh term on the city council, and this time around, she will have some competition in the general election.
Running against Ms. Clyburn is Republican Eric Schmidt.
A primary election will not take place for District 1.
Two Republicans have filed for the District 3 city council seat, necessitating a Sept. 11 primary election. Running against Mr. Sprawls is Republican Dick Dewar.
Residents must register to vote 30 days before the primary.
Reach Michelle Guffey at (803) 648-1395, ext. 110, or firstname.lastname@example.org.