Mercer County, Ohio
Mercer County, Ohio voter information: how to register, check your status, see your sample ballot and contact your local election office. Home to about 42,600 people, Mercer County ranks 57th in population among Ohio's 88 counties. In Ohio, each county board of elections handles registration, early voting, absentee ballots and sample ballots.
Next Election
March 21, 2028
Voter Portal
Register Online
What's On My Ballot?
ID Requirements
Absentee / Early Voting
Registration Deadline
Register at least 30 days before an election.
Why Voting Matters
In Mercer County, the people who show up to vote decide who represents everyone. The next election for Mercer County voters is Ohio's statewide primary on March 21, 2028; local elections can come sooner, so check your local election office. With manufacturing and health care among the county's biggest employers, issues like manufacturing jobs are decided by the officials voters choose.
In the 2024 presidential election, about 23,800 ballots were cast in Mercer County, about the same as the 23,800 cast in 2020. With roughly 32,300 adults living in the county, that is around 74% of adult residents, above the statewide rate of about 61%.
Around 8,540 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 427 extra Mercer County ballots, enough to change the result in many close contests.
Mercer County spans about 462 square miles of small towns and countryside, averaging roughly 92 people per square mile. The county is home to about 0.4% of Ohio's population.
ZIP codes in or partly in Mercer County include 45310, 45348, 45388, 45822, 45826, 45828, 45845 and 45846, plus 11 more. Confirm your registration, read through your sample ballot before Election Day, and choose whether you will vote early, by mail or in person. Invite someone you know in Mercer County to join you.
Voter Assistance Resources
Who runs elections in Mercer County? In Ohio, each county board of elections handles registration, early voting, absentee ballots and sample ballots. For registration, polling places, early voting and absentee ballots, contact the Mercer County board of elections.
Statewide directory, Ohio Secretary of State's county boards of elections directory:
https://www.ohiosos.gov/elections/elections-officials/county-boards-of-elections-directory/
See your sample ballot. Ohio Secretary of State's sample ballot directory:
https://www.ohiosos.gov/directories/sample-ballot
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 Mercer 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 Disability Rights Ohio, Ohio's Protection and Advocacy agency, at (800) 282-9181. 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 Ohio 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 Mercer 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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