Cooper County Government

Boonville is the county seat, and the Cooper County Court House sits at the corner of Main and High streets. Office hours differ by office, so they are listed with each one below.

Where and when

Cooper County Court House
200 Main Street, Boonville, MO 65233
Corner of Main and High streets. Clerk, collector, assessor, treasurer, sheriff and public administrator are inside.
Commissioners Office
527 High Street, Boonville, MO 65233
The Commission meets in regular session Mondays and Thursdays, 9 a.m. to 5 p.m. The office is open Tuesday, Wednesday and Friday, 9 a.m. to 1 p.m. The official agenda is posted in the office window.

Who to call

Commissioners Office
(660) 882-2228
County Clerk (elections, voter registration)
(660) 882-2114
Room 23, second floor. 8 a.m. to 5 p.m.
Assessor
(660) 882-2646
Collector (property taxes)
(660) 882-2584
Second floor. Monday to Friday, 9 a.m. to 5 p.m. A drop box is on the north side of the court house.
Recorder of Deeds
Monday to Friday, 9 a.m. to 4 p.m., by appointment for marriage licenses.
Treasurer
(660) 882-0451
Room 21
Public Administrator
(660) 882-5022
Monday to Friday, 9 a.m. to 5 p.m.
Sheriff's Office (office line; emergency, dial 911)
(660) 882-2771
Room 3. Monday to Friday, 8 a.m. to 4 p.m. Call ahead for non-emergency services; hours can vary.
Detention Center
(660) 882-6985
Emergency Management (EMA)
(660) 882-0400
200 Main St. Outdoor warning sirens are tested the first Tuesday of each month at 11 a.m., weather permitting.

In an emergency, call 911.

The Prosecuting Attorney's Office has temporarily moved to 401 Main Street, in the Boonville City Hall building, during construction (per the county's home page).

Official links

Phone numbers, addresses and hours come from the county's own websites (checked October 29, 2026). Offices can change them; call ahead.

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