Mercer County, New Jersey
Your guide to voting in Mercer County, New Jersey: registration, sample ballots, ID requirements and where to get local help. Home to about 392,000 people, Mercer County ranks 12th in population among New Jersey's 21 counties. In New Jersey, the county clerk handles mail-in ballots and sample ballots, and the county board of elections and superintendent of elections handle registration and polling places.
Next Election
June 8, 2027
Voter Portal
Register Online
What's On My Ballot?
ID Requirements
Absentee / Early Voting
Registration Deadline
Register at least 21 days before an election.
Why Voting Matters
Why does voting matter in Mercer County? Because every eligible voter here has exactly the same power at the ballot box: one vote. The next election for Mercer County voters is New Jersey's primary on June 8, 2027, for all State Senate and General Assembly seats; local elections can come sooner, so check your local election office. Many Mercer County jobs are in health care and professional and technical services, so decisions about health care costs and broadband and innovation hit close to home.
About 163,000 people voted for president in Mercer County in 2024 (down about 8% from 177,000 in 2020). That equals roughly 52% of the county's estimated 312,000 adults, below the statewide rate of about 57%.
Put another way, about 149,000 adults in Mercer County sat that election out. Not all of them can vote, but if even 5% of them did, that would be roughly 7,440 more ballots, often more than the margin in races for local councils, school boards, the legislature or Congress.
Mercer County packs about 1,748 people into each square mile across 224 square miles, so a single precinct can hold thousands of voters. The county is home to about 4.1% of New Jersey's population.
ZIP codes in or partly in Mercer County include 08501, 08512, 08515, 08520, 08525, 08530, 08534 and 08540, plus 28 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 New Jersey, the county clerk handles mail-in ballots and sample ballots, and the county board of elections and superintendent of elections handle registration and polling places. For registration, polling places, early voting and absentee ballots, contact the Mercer County clerk and county board of elections.
Statewide directory, New Jersey Division of Elections county information page:
https://www.nj.gov/state/elections/county-vbm-forms.shtml
See your sample ballot. New Jersey county election information (your county mails your sample ballot):
https://www.nj.gov/state/elections/county-vbm-forms.shtml
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 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 New Jersey, New Jersey's Protection and Advocacy agency, at (609) 292-9742. 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 New Jersey 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
Take the Next Step
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