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.
Sheriff. The sheriff runs the county's law enforcement agency, operates the county jail, provides courthouse security and serves court papers such as warrants, subpoenas and evictions. In many counties the sheriff's office is the primary police force for areas outside city limits. The sheriff hires deputies and manages the office's budget within what the county board approves.
This race. Every voter in DuPage County votes on this seat.
Illinois › DuPage County › DuPage County Sheriff
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 was found as of September 8, 2026; the official election filing is the only verifiable source for Peter Joseph Coolidge.
Republican
Per the campaign site.
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.
Who is running for DuPage County Sheriff in 2026?
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.
When is the DuPage County Sheriff 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 DuPage 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 DuPage 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 DuPage County sample ballot and your exact ballot by address.
47 tracked races in DuPage County, Illinois. Landed here from another county's search? Look up your own ballot below.