Jeffrey D. Allred, Deseret News
Salt Lake City Mayoral candidates Mayor Ralph Becker and Jackie Biskupski debate during a KSL TV and KSL Newsradio hosted event in Salt Lake City Wednesday, Oct. 14, 2015.

SALT LAKE CITY (AP) — 8:15 p.m.

Salt Lake County Clerk Sherrie Swensen says early returns in in the Salt Lake City mayor's race will be delayed Tuesday as polling centers stay open to accommodate long lines of voters.

Swensen says the voters were in line before polls were supposed to close at 8 p.m., so they're still allowed to cast ballots.

Election workers in Millcreek and Salt Lake City estimate it will take them about half an hour to let everyone vote.

Swensen says initial results will be released sometime soon after that time.

3:45 p.m.

Salt Lake County Clerk Sherrie Swensen says voter participation is already higher in Salt Lake City than it was in the last mayoral election.

Swensen says this year's tight mayoral race between incumbent Ralph Becker and former state lawmaker Jackie Biskupski may be boosting turnout, but she thinks it's higher largely because the election is being conducted almost entirely by mail.

She says turnout just before noon Tuesday was about 45 percent. She says she expects turnout to hit 55 percent following a steady stream of voters dropping off mail-in ballots or voting in person before vote centers close at 8 p.m.

Swensen says turnout in Salt Lake City four years ago was about 23 percent. Turnout in 2007, during another close mayoral race, was about 45 percent.

Early returns will be released around 8 p.m. Tuesday.