Ada County, Idaho
Your guide to voting in Ada County, Idaho: registration, sample ballots, ID requirements and where to get local help. Home to about 536,000 people, Ada County is the most populous of Idaho's 44 counties. In Idaho, the county clerk handles voter registration, absentee ballots and polling places.
Next Election
May 16, 2028
Voter Portal
Register Online
What's On My Ballot?
ID Requirements
Absentee / Early Voting
Registration Deadline
Register online or by mail before the pre-registration deadline for each election; Election Day registration is available in person with ID and proof of residence.
Why Voting Matters
Why does voting matter in Ada County? Because every eligible voter here has exactly the same power at the ballot box: one vote. The next election for Ada County voters is Idaho's primary election on May 16, 2028; local elections can come sooner, so check your local election office. Local work in health care and retail means debates over health care costs directly affect Ada County families.
In the 2024 presidential election, about 267,000 ballots were cast in Ada County, up about 3% from 259,000 in 2020. With roughly 419,000 adults living in the county, that is around 64% of adult residents, above the statewide rate of about 59%.
Around 152,000 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 7,610 extra Ada County ballots, enough to change the result in many close contests.
Across about 1,052 square miles, Ada County averages around 509 people per square mile, mixing neighborhoods, towns and open land. About 27% of all Idaho residents live here.
ZIP codes in or partly in Ada County include 83616, 83634, 83641, 83642, 83646, 83669, 83680 and 83687, plus 23 more. Take two minutes to confirm your registration, preview your ballot with the links on this page, and decide when and how you will vote. Bring a neighbor along.
Voter Assistance Resources
Who runs elections in Ada County? In Idaho, the county clerk handles voter registration, absentee ballots and polling places. For registration, polling places, early voting and absentee ballots, contact the Ada County clerk.
Statewide directory, VoteIdaho's Find Your County Clerk page:
https://voteidaho.gov/county-clerk/
See your sample ballot. VoteIdaho's What's On the Ballot page:
https://voteidaho.gov/on-the-ballots/
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 Ada 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 Idaho, Idaho's Protection and Advocacy agency, at (208) 336-5353. 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 Idaho 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 Ada 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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