Winnebago County, Illinois

Winnebago County Treasurer

Illinois › Winnebago County › Winnebago County Treasurer

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.

Theresa Grennan

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 or questionnaire response was found as of September 8, 2026; the official election filing is the only verifiable source for Theresa Grennan.

Verify this race
Candidate roster from official Winnebago County Supervisor of Elections filings. 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.