Voter Information

Upcoming Elections For District 21 Voters

The Spring Election is April 7, 2026 for the following:

Justice of the Supreme Court
Court of Appeals Judges - District 4
Rock County Supervisors
School Board Members
Any Referendums

Mail-In Voters. Important Update on USPS (Mail) postmark changes. Effective December 24, 2025, the United States Post Office moved its postmark process from local offices to their regional sorting centers.

Postmark might not be added the day you send it. You can request a manual postmark at the local office counter in person
Votes might not count if received after election day
Allow extra delivery time by sending mail-in ballots at least a week before

To view your polling place, view your sample ballot and other important voter and election information, click the link below

Check Out Your Voter Information at MyVote.wi.gov

Supervisory District Map

Rock County, Wisconsin
Adopted: November 15, 2021

District Adjacent Municipalities

Click Map for a Larger PDF View

Campaign News

Information to Come

Dennis Hilgendorf Working Hard For You

As Supervisor of District 21, I will work to ensure that your tax dollars are used efficiently in order to provide you with the best county essential services.