In addition to selecting a mayor, voters are also deciding the fate of four ballot issues.
Those include snow gates and a citywide zoning plan. But the two issues that have prompted the most mailers and campaign signs are zoning for a southside Walmart store and an outdoor pool in the center of town.
Big ballot issues and warm weather bring voters out in droves.
"Wow. I've never seen it like this. Never. Not all these cars. Just, holy smokes we're going to be in a long line," Sheila Crawford said while voting at 57th Street and Minnesota Avenue.
Both polling places at 57th and Minnesota, as well as 33rd Street and Western Avenue have lines going out the doors.
While many people said they came out to vote because it's their civic duty, residents in the Spellerberg neighborhood said they're on a mission.
"I just don't think the increased traffic would be necessarily good for my neighborhood. I'm for an indoor pool. Don't get me wrong. I just don't think that Spellerberg is the right place for it," Spellerberg neighborhood resident Emelie Haigh said.
Mayoral races do typically have a high turnout, but Tuesday's numbers are still surprising, even for longtime voters.
"It's good that there's that much of a turnout that there's enough people that are concerned about the issues that are on the ballot. Usually I don't see lines like this when I go out and vote," Sioux Falls voter Janet Lundquist said.
"It's not just all one sided. Everybody's getting to voice their opinion. I think that's good," Crawford said.
"It's good that they're exercising their civic duty. But I think that there's probably more interest in this election, outside of a presidential election, than I've seen since I've been in Sioux Falls, which is about seven years now," Bob Crawford said.
"There's a lot of things like the Walmart that are very personal to people. Things that people feel very strongly about. And also it's just a beautiful day. So why wouldn't you want to go out and vote," Haigh said.