Peter Coolidge Wins DuPage County Sheriff’s Race

Democrat Peter Coolidge has been elected DuPage County sheriff, defeating Republican Sean Noonan in the November 3 election and ending the GOP’s hold on the sheriff’s office. Unofficial results show Coolidge with 195,657 votes, or about 60%, compared with 131,289 votes, or about 40%, for Noonan.

Coolidge, a West Chicago resident and longtime DuPage County sheriff’s deputy, brings nearly 28 years of experience with the department. He retired in 2024 after working in corrections, law enforcement and courthouse security.

He will succeed Republican Sheriff James Mendrick, who did not seek a third term. Noonan, a former DuPage County Board member, is an Oakbrook Terrace police officer.

During his campaign, Coolidge focused on public safety, community trust and accountability. His priorities included improving staffing and employee retention, responsible use of license-plate reader technology, expanding mental-health resources, and offering free gun-safety and safe-storage training. He also proposed creating specialized teams to handle domestic violence and sexual-assault cases.

Following his victory, Coolidge thanked supporters at the York Township Democratic office as his campaign concluded and preparations began for the transition to his new role.