Warren County, Missouri
Everything a Warren County, Missouri voter needs in one place: registration, voter ID, absentee and early voting, and your sample ballot. Home to about 38,500 people, Warren County ranks 31st in population among Missouri's 115 counties. In Missouri, elections are run by local election authorities: the county clerk in most counties, or a board of election commissioners in several cities and counties.
Next Election
August 8, 2028
Voter Portal
Register Online
What's On My Ballot?
ID Requirements
Absentee / Early Voting
Registration Deadline
Register by the fourth Wednesday before an election.
Why Voting Matters
Every eligible adult in Warren County, Missouri holds the same power on Election Day: one vote that counts exactly as much as anyone else's. The next election for Warren County voters is Missouri's state primary on August 8, 2028; local elections can come sooner, so check your local election office. With manufacturing and retail among the county's biggest employers, issues like manufacturing jobs are decided by the officials voters choose.
About 20,100 people voted for president in Warren County in 2024 (up about 9% from 18,400 in 2020). That equals roughly 67% of the county's estimated 30,000 adults, above the statewide rate of about 61%.
Put another way, about 9,900 adults in Warren County sat that election out. Not all of them can vote, but if even 5% of them did, that would be roughly 495 more ballots, often more than the margin in races for local councils, school boards, the legislature or Congress.
With about 90 residents per square mile over 429 square miles, Warren County is a place where neighbors often know their local officials. The county is home to about 0.6% of Missouri's population.
ZIP codes in or partly in Warren County include 63342, 63348, 63349, 63351, 63357, 63363, 63378 and 63379, plus 5 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 Warren County to do the same.
Voter Assistance Resources
Local election help in Warren County: In Missouri, elections are run by local election authorities: the county clerk in most counties, or a board of election commissioners in several cities and counties. For registration, polling places, early voting and absentee ballots, contact the Warren County local election authority (county clerk or board of election commissioners).
Statewide directory, Missouri Secretary of State elections division:
https://www.sos.mo.gov/elections/
See your sample ballot. Missouri Secretary of State elections division (voter lookup shows sample ballots):
https://www.sos.mo.gov/elections/
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 Warren 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 Missouri Protection & Advocacy, Missouri's Protection and Advocacy agency, at (573) 893-3333. 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 Missouri 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 Warren 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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