Illinois › Dupage County › DuPage County Sheriff
2 candidates are tracked for DuPage County Sheriff on the November 3, 2026 ballot: Peter Joseph Coolidge and Sean T. Noonan. Candidate information follows official Dupage County election filings; verify with the official election office linked below.
Peter Joseph Coolidge ran unopposed for the Democratic nomination; Sean T. Noonan won the Republican nomination with 66.51 percent of the vote over Edmond (Eddie) Moore in the March 17 primary; they meet on the November 3 ballot, per the county's official canvass. Neither is the sitting sheriff, James Mendrick.
Democratic
Peter Joseph Coolidge appears on the November 3, 2026 ballot for DuPage County Sheriff, per the county elections office's certified candidate list. No campaign website or questionnaire response was found as of September 8, 2026; the official election filing is the only verifiable source for Peter Joseph Coolidge.
Republican
Sean Noonan has spent 23 years in law enforcement, including as a supervisor, and served eight years as an elected DuPage County Board member, per Sean Noonan campaign site. Noonan's law enforcement career was largely with the Bloomingdale Police Department, where he rose to sergeant; he is currently a police officer for the City of Oakbrook Terrace, per Daily Herald / DuPage Policy Journal reporting.
Source: candidate campaign site.
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