The Ballot Brief
Illinois
Candidate profile

Theresa Grennan

Democratic · Illinois · 2026 · Incumbent

On the ballot

Winnebago County TreasurerIllinois · 2026Winnebago County sample ballot
Biography

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.

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Profile facts follow official election office filings and the sources cited in each biography. Roster last verified September 29, 2026. Official sources are the final word on who appears on your ballot.

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