One candidate is tracked for Winnebago County Treasurer on the November 3, 2026 ballot: Theresa Grennan. Candidate information follows official Winnebago County election filings; verify with the official election office linked below.
Democratic incumbent Theresa Grennan is unopposed; no Republican filed. Source: Winnebago County Clerk's official November 3, 2026 candidate list.
County treasurer. The county treasurer collects property taxes and other revenue, holds the county's funds, and invests them under state rules. The treasurer distributes tax collections to the county, cities, school districts and special districts that levy them. The office is a custodian of public money, not the body that sets the tax rate.
This race. Every voter in Winnebago County votes on this seat. The sitting officeholder, Theresa Grennan, is on the ballot. One name is on the ballot for this seat.
Illinois › Winnebago County › Winnebago County Treasurer
Democratic Incumbent
Theresa Grennan has worked in the Winnebago County Treasurer's office since 1994 and previously served as chief deputy treasurer before being appointed treasurer on January 31, 2025, per Winnebago County Treasurer's Office, official page. No campaign website was found as of September 8, 2026; the official election filing is the only verifiable source for Theresa Grennan.
Who is running for Winnebago County Treasurer in 2026?
One candidate is tracked for Winnebago County Treasurer on the November 3, 2026 ballot: Theresa Grennan. Candidate information follows official Winnebago County election filings; verify with the official election office linked below.
When is the Winnebago County Treasurer election in Illinois?
Election Day is Tuesday, November 3, 2026. Registration deadlines, early voting dates and mail ballot rules for Illinois are on the Illinois election hub at theballotbrief.com.
How do I see my exact Winnebago County ballot?
Enter your ZIP code in the lookup at theballotbrief.com for the statewide and congressional races, or a full street address to add the county, city and district contests for that location.
Candidate roster from official Winnebago County and state election office filings, last verified September 29, 2026. Bios and priorities carry their attribution inline.
Cross-check with the official Illinois election office, or see the full Winnebago County sample ballot and your exact ballot by address.
29 tracked races in Winnebago County, Illinois. Landed here from another county's search? Look up your own ballot below.