Hinsdale attorney Julie Renehan was the lead vote-getter March 20 in the three-way Democratic primary to represent District 3 on the DuPage County Board.
Renehan received 50.2 percent of the vote, or 9,462 votes, according to unofficial results from the DuPage County Election Commission.
She will join Downers Grove resident John Basco on the November ballot.
Basco garnered 4,875 votes, or about 25.9 percent, to edge out Mehr Qayyum, who finished third with 4,510 votes, or about 23.9 percent, preliminary numbers show.
Renehan, 49, said she decided to run in part because the present makeup of the County Board, which has one Democrat and four women, needs to change.
Basco, 43, said he decided to run because "there is a lack of empathy in government."
A digital strategist for a health care organization, Basco plans to use his professional skills to "get creative with problem solving" on the County Board.
Renehan and Basco will face Republican candidates Martin Tully and Greg Hart in the November general election.
Tully is the mayor of Downers Grove, and Hart, a resident of Hinsdale, was appointed in 2017 to fill a vacancy on the County Board.
District 3 includes all or parts of Bolingbrook, Burr Ridge, Clarendon Hills, Darien, Downers Grove, Hinsdale, Lemont, Naperville, Westmont, Willowbrook and Woodridge.