U.S. House Illinois District 12 General

About This Race

The U.S. House Illinois District 12 general election will be held on November 3, 2026, to determine the representative for Illinois's 12th congressional district in the U.S. House of Representatives. The district covers parts of southern and central Illinois, including cities such as Belleville, Effingham, and Marion.

Candidates

• Mike BostINC
• Christina Haag

Important Dates

Election Date

November 3, 2026

Registration Deadline

October 16, 2026

Early Voting Starts

October 26, 2026

Early Voting Ends

November 1, 2026

How to Vote

To vote in Illinois, residents must be U.S. citizens, at least 18 years old by Election Day, and reside in the state for at least 30 days prior. Registration can be completed online, by mail, or in person, with a deadline of October 16, 2026. Early voting begins October 26 and runs through November 1, and voters may cast ballots in person at designated polling places or by mail with an absentee ballot request submitted by October 29.