Sioux County, Iowa
Sioux County, Iowa voter information: how to register, check your status, see your sample ballot and contact your local election office. Home to about 36,600 people, Sioux County ranks 19th in population among Iowa's 99 counties. In Iowa, the county auditor is the county's commissioner of elections and handles registration, absentee ballots and polling places.
Next Election
June 6, 2028
Voter Portal
Register Online
What's On My Ballot?
ID Requirements
Absentee / Early Voting
Registration Deadline
Register online or by mail at least 15 days before an election; you can also register in person, including on Election Day.
Why Voting Matters
Why does voting matter in Sioux County? Because every eligible voter here has exactly the same power at the ballot box: one vote. The next election for Sioux County voters is Iowa's primary election on June 6, 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.
Sioux County voters cast about 18,900 ballots for president in 2024, about the same as the 19,100 cast in 2020. Compared with the county's roughly 27,100 adult residents, that works out to about 70%, above the statewide rate of about 65%.
That means roughly 8,200 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, Sioux County would add about 410 voices, more than enough to decide a close local race.
Sioux County spans about 768 square miles of small towns and countryside, averaging roughly 48 people per square mile. The county is home to about 1.1% of Iowa's population.
ZIP codes in or partly in Sioux County include 51003, 51011, 51022, 51023, 51027, 51031, 51036 and 51041, 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 Sioux County to join you.
Voter Assistance Resources
Questions about voting in Sioux County? In Iowa, the county auditor is the county's commissioner of elections and handles registration, absentee ballots and polling places. For registration, polling places, early voting and absentee ballots, contact the Sioux County auditor.
Direct link, Iowa Secretary of State county auditor contact page:
https://sos.iowa.gov/elections/auditors/auditor.asp?CountyID=84&btnGo=Go
Statewide directory, Iowa Secretary of State's county auditor list:
https://sos.iowa.gov/elections/voterinformation/index.html
See your sample ballot. Iowa Secretary of State general election page (sample ballots come from your county auditor):
https://sos.iowa.gov/general-election
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 Sioux 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 Iowa, Iowa's Protection and Advocacy agency, at (800) 779-2502. 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 Iowa 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 Sioux 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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