Illinois voters face tight House margins in 2026 midterms

Polls in Illinois opened at 6 a.m. On Tuesday, November 3, 2026, with voting continuing until 7 p.m. Local time. Residents in Cook County, including those in Chicago, Cicero, Evanston, Arlington Heights, Skokie, and Des Plaines, are heading to the polls for the midterm election. These polls are open for the general election, which determines who controls Congress for the final two years of President Donald Trump's second term. The state holds 18 U.S. House seats and one U.S. Senate seat up for grabs, along with the governorship and various state and local offices.

The U.S. Senate race in Illinois is an open seat, meaning no incumbent is running for re-election. Ballotpedia notes that the parties on the ballot are the Democratic and Republican parties. This contest is part of a national trend where 35 of the 100 Senate seats are at stake. Republicans currently hold 53 seats, while Democrats hold 45, plus two independents who caucus with Democrats. To achieve a majority, Democrats need a net gain of four seats, whereas Republicans can afford to lose only two.

In the U.S. House, all 435 seats are on the ballot nationwide. In Illinois, every U.S. House seat is up for election. Currently, Republicans hold 218 House seats, Democrats hold 214, and there is one independent. The margin is razor-thin, with Democrats needing a net gain of three districts to secure a majority. Conversely, Republicans can lose no more than two seats to maintain their control. This three-seat margin makes the national House race one of the tightest in recent memory.

46 battleground districts are identified across the country, including 25 held by Democrats and 21 held by Republicans. 21 Democratic-held districts voted for President Trump in 2024, while nine Republican-held districts voted for Kamala Harris. These numbers highlight the competitive nature of the races and the potential for shifts in both chambers. In Illinois, the outcome of these 18 House races will significantly impact the national balance of power.

Voters in Cook County are also deciding on the governorship, where incumbent Democratic Governor JB Pritzker is running for re-election. Ballotpedia lists the Democratic, Green, Independent, and Republican parties on the ballot for this race. The governor's race is one of 36 statewide contests across the nation. Democrats currently hold 24 governorships, while Republicans hold 26. Democrats would need a net gain of two governorships to achieve a nationwide majority, a position Republicans have held since 2010.

The election is described as a referendum on the administration, with voters citing high prices and dissatisfaction with the war with Iran as key issues. 35 percent of U.S. Adults approve of Trump's job performance, while only 25 percent approve of his handling of the economy. About seven in 10 Americans say the country is heading in the wrong direction. These sentiments are likely influencing how voters in Illinois and across the county cast their ballots.

More than 57 million people had already voted as of Monday, surpassing the early vote totals from four years ago in many closely watched states. The U.S. Postal Service added hours, staff, and special lines to ensure mail ballots are counted on time. In Illinois, voters can find their polling place at vote.gov or through their state election office. Anyone in line when polls close is entitled to vote, and ID rules vary by state, so voters are encouraged to check specific requirements before heading to the polls.

Republicans were bracing to lose the House while fighting to hold the Senate, with one or two seats potentially tipping either chamber. Democrats were described as cautiously optimistic. The election is expected to be the most expensive in history, with Republican committees outraising and outspending Democratic committees at the national level, aided by Trump-affiliated groups and Elon Musk. However, at the candidate level, Democrats outraised their opponents. This financial dynamic is shaping the campaigns in Illinois and the broader Midwest.

In Illinois, the new congressional maps do not apply, as the state is not among the six using new maps after mid-decade redistricting. The states using new maps are California, Florida, Missouri, North Carolina, Tennessee, and Texas, with Ohio also utilizing a new map. For Illinois voters, the focus remains on the specific candidates for the 18 House seats and the open Senate seat. The outcome in these districts will determine whether the three-seat margin favors Democrats or Republicans in the coming Congress.

As polls close at 7 p.m., the results will begin to trickle in, offering the first glimpse of who controls Congress for the next two years. If Democrats win even one chamber, investigations and possible impeachment proceedings become likely. House Democratic Leader Hakeem Jeffries would be the first Black speaker if Democrats take the House, and he has outlined a 100-day agenda focused on the cost of living and oversight. The stakes are high for Cook County voters, whose choices will contribute to this national shift.

The election also has implications for the 2028 presidential cycle. A strong Democratic night would boost potential candidates such as Gavin Newsom, JB Pritzker, and Pete Buttigieg, while potentially complicating the path for Vice President JD Vance. Republicans tried to beat the typical midterm pattern of a president's party losing seats through redistricting, but new districts in other states may not vote as drawn. In Illinois, the traditional patterns of voting behavior will play out in the 18 House districts, with voters in towns like Skokie and Des Plaines making critical decisions that ripple across the nation.