St. Louis County, Missouri
Everything a St. Louis County, Missouri voter needs in one place: registration, voter ID, absentee and early voting, and your sample ballot. Home to about 993,000 people, St. Louis County is the most populous of 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
Voting is how St. Louis County residents shape the decisions made in their name. The next election for St. Louis County voters is Missouri's state primary on August 8, 2028; local elections can come sooner, so check your local election office. With health care and retail among the county's biggest employers, issues like health care costs are decided by the officials voters choose.
About 502,000 people voted for president in St. Louis County in 2024 (down about 6% from 536,000 in 2020). That equals roughly 64% of the county's estimated 789,000 adults, close to the statewide rate of about 61%.
That means roughly 286,000 adult residents did not cast a presidential ballot. Some are not eligible, but many are, and that is a lot of untapped power. If just one in 20 of them voted, St. Louis County would add about 14,300 voices, more than enough to decide a close local race.
Spread over about 508 square miles, St. Louis County averages roughly 1,956 residents per square mile, one of the denser places in Missouri. About 16% of all Missouri residents live here.
ZIP codes in or partly in St. Louis County include 63005, 63006, 63011, 63017, 63021, 63022, 63024 and 63025, plus 47 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 St. Louis County to do the same.
Voter Assistance Resources
Questions about voting in St. Louis 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 St. Louis 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.
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 St. Louis 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 St. Louis 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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