Jefferson County, Illinois
Jefferson County, Illinois voter information: how to register, check your status, see your sample ballot and contact your local election office. Home to about 36,100 people, Jefferson County ranks 38th 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 Jefferson County? Because every eligible voter here has exactly the same power at the ballot box: one vote. The next election for Jefferson County voters is Illinois's general primary on March 21, 2028; local elections can come sooner, so check your local election office. Local work in manufacturing and health care means debates over manufacturing jobs directly affect Jefferson County families.
In the 2024 presidential election, about 16,600 ballots were cast in Jefferson County, down about 5% from 17,400 in 2020. With roughly 28,600 adults living in the county, that is around 58% of adult residents, close to the statewide rate of about 56%.
Around 11,900 adults here did not vote for president. Some aren't eligible, yet the rest are untapped power: one more voter in every 20 of them would mean about 596 extra Jefferson County ballots, enough to change the result in many close contests.
Jefferson County spans about 571 square miles of small towns and countryside, averaging roughly 63 people per square mile. The county is home to about 0.3% of Illinois's population.
ZIP codes in or partly in Jefferson County include 62801, 62808, 62810, 62814, 62816, 62828, 62830 and 62831, plus 14 more. Check that your registration is current, look up your sample ballot, and make a plan to vote. Then ask a friend or family member in Jefferson County to do the same.
Voter Assistance Resources
Local election help in Jefferson 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 Jefferson 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.
To ask a question or report a problem at the polls, call or text Election Protection at 866-OUR-VOTE (866-687-8683), a free nonpartisan hotline. For help in Spanish call 888-VE-Y-VOTA (888-839-8682); for Asian languages call 888-API-VOTE (888-274-8683).
Voters with disabilities in Jefferson 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 Jefferson 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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