Incumbents Dan Moore, Pete Groetken and Alex Watters will look to retain their seats.
Moore and Groetken are finishing up their first four-year term on the council.
Meanwhile, Watters will be running for his first full term on the council, after he was appointed back in February to finish out former councilman Keith Radig's term.
The three will be up against a pool of six challengers including Jake Jungers, Brett Watchorn, Nick Davidson, John Olson, Doug Waples and Dennis Quinn.
The top six finishers advance to the general election on November 7.
Compared to the November elections, these elections usually see less traffic at the polls.
To make the entire process quicker- voters should make sure to bring their drivers license.
First time voters can register at the voting center.
Long-time Sioux City resident, Rudy Salem, says voting for City Council is something everyone should be a part of.
"I think everybody should vote for City Council," said Rudy Salem, Voter. "Our taxes, everything involved with the city, we're all interested in that. Rather than complain about it, come out and find out who the best people are, and vote for them."
Another voter, a mother of two, thinks it is important to bring her children with her to the polls.
"I hope that they grow up and realize that they have a voice in their community, and they don't have to be an elected official to have a say in local politics," said Lindsay Hindman, voter.