St. Clair County, Illinois
Voting in St. Clair County, Illinois? Find registration links, ID rules, early and absentee voting options and your sample ballot here. Home to about 251,000 people, St. Clair County ranks 9th in population among Illinois's 102 counties. In Illinois, elections are run by local election authorities: usually the county clerk, or a board of election commissioners in some cities and counties.
Next Election
March 21, 2028
Voter Portal
Register Online
What's On My Ballot?
ID Requirements
Absentee / Early Voting
Registration Deadline
Register by mail at least 28 days before an election or online until 16 days before; grace-period and same-day registration are also available in person through Election Day.
Why Voting Matters
Why does voting matter in St. Clair County? Because every eligible voter here has exactly the same power at the ballot box: one vote. The next election for St. Clair County voters is Illinois's general primary on March 21, 2028; local elections can come sooner, so check your local election office. Many St. Clair County jobs are in health care and retail, so decisions about health care costs and local businesses hit close to home.
In the 2024 presidential election, about 120,000 ballots were cast in St. Clair County, down about 7% from 128,000 in 2020. With roughly 196,000 adults living in the county, that is around 61% of adult residents, above the statewide rate of about 56%.
Put another way, about 76,600 adults in St. Clair County sat that election out. Not all of them can vote, but if even 5% of them did, that would be roughly 3,830 more ballots, often more than the margin in races for local councils, school boards, the legislature or Congress.
St. Clair County covers about 658 square miles, with roughly 382 residents per square mile. The county is home to about 2.0% of Illinois's population.
ZIP codes in or partly in St. Clair County include 62059, 62060, 62071, 62201, 62202, 62203, 62204 and 62205, plus 30 more. Take two minutes to confirm your registration, preview your ballot with the links on this page, and decide when and how you will vote. Bring a neighbor along.
Voter Assistance Resources
Local election help in St. Clair County: In Illinois, elections are run by local election authorities: usually the county clerk, or a board of election commissioners in some cities and counties. For registration, polling places, early voting and absentee ballots, contact the St. Clair County election authority (county clerk or board of election commissioners).
Statewide directory, Illinois State Board of Elections' election authorities list:
https://www.elections.il.gov/electionoperations/ElectionAuthorities.aspx
See your sample ballot. Illinois election authorities list (your local election authority posts sample ballots):
https://www.elections.il.gov/electionoperations/ElectionAuthorities.aspx
You can also preview a personalized ballot at Vote411.org.
Free, nonpartisan help is available before and on every Election Day: call or text the Election Protection hotline at 866-OUR-VOTE (866-687-8683). Spanish: 888-VE-Y-VOTA (888-839-8682). Asian languages: 888-API-VOTE (888-274-8683).
Voters with disabilities in St. Clair County can ask for an accessible voting machine, curbside voting where offered, and help from a person of their choice. If you run into barriers, contact Equip for Equality, Illinois's Protection and Advocacy agency, at (800) 537-2632. VoteRiders (844-338-8743) offers free help with voter ID.
Need a ride? Many local transit agencies and ride services offer free or discounted rides to the polls on Election Day, so check what is available before the next election. See our Illinois voter page for statewide options. Details can change, so confirm with the official election office.
Military and overseas voters can get help from the Federal Voting Assistance Program at 1-800-438-VOTE (8683) or fvap.gov.
Sign up to be an election worker
Election workers (often called poll workers) keep voting running smoothly in St. Clair County. Most are paid for their time, get free training, and help their neighbors cast their ballots. You can work a full day, a shorter shift, or help before Election Day. County and municipal election offices recruit and train their own workers, and the EAC's Help America Vote page links to yours. Find out how to sign up:
https://www.eac.gov/help-america-vote
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