Peter Joseph Coolidge won the DuPage County Sheriff race with 60.5% of the vote, according to unofficial results from the DuPage County Clerk.

Coolidge received 174,868 votes to Sean T. Noonan's 114,381. That's a margin of 60,487 votes, or 21.0 percentage points. All 600 of the county's 600 reporting units have reported, with 289,249 votes counted. The DuPage County Clerk last updated the results at 9:36 p.m. CST on Tuesday, Nov. 3.

Election results: DuPage County Sheriff (Illinois General Election, 2026-11-03)

Candidate

Party

Votes

Percent

PETER JOSEPH COOLIDGE

174,868

60.5%

SEAN T. NOONAN

114,381

39.5%

Total

289,249

Source: DuPage County Clerk. Results current as of Nov. 3, 2026, 9:36 p.m. CST. Reporting: 600 of 600. Unofficial results; every reporting unit has reported.