Rock County is a county in the U.S. state of Wisconsin. Its county seat is Janesville. Rock County was created in 1836 as a territorial county on December 7, 1836

Rock County comprises the Janesville-Beloit, WI Metropolitan Statistical Area and is included in the Madison-Janesville-Beloit, WI Combined Statistical Area.

Departments and Elected Offices

Departments-

Administration
Aging & Disability Resource Center (ADRC)
Airport
Child Support Enforcement
Communications Center - 911
Corporation Counsel
Council on Aging
Circuit Court
Developmental Disabilities
Finance
Highway
Human Resources
Human Services
Land Conservation
Mediation & Family Court Services
Medical Examiner
Parks
Planning, Economic & Community Development
Public Health
Purchasing
Real Property Lister
Rock Haven
Transportation
UW Extension
Veterans Service Office

Elected Offices-

Treasurer
Rock County Courthouse
2nd Floor East Wing
51 South Main Street
Janesville, WI 53545
Monday - Friday Hours
8:00 AM - 5:00 PM
Closed on Holidays

Clerk of Circuit Court
Rock County Courthouse
51 South Main Street
Janesville, WI 53545
Phone 608-743-2200
Fax 608-743-2223
Monday - Friday
Office Hours:
7:45 AM - 4:45 PM

County Clerk
Rock County Courthouse
51 South Main Street
Janesville, WI 53545
Open 8:00 AM - 5:00 PM

District Attorney
Rock County Courthouse
51 South Main St Janesville, WI 53545
Phone: 608-757-5615
Fax: 608-757-5725

Register of Deeds
Rock County Courthouse
51 S Main St Janesville, WI 53545
Phone 608-757-5650
Fax 608-757-5563
Monday - Friday Hours
8:00 AM - 5:00 PM

Rock County Sheriff's Office
200 E US Highway 14
Janesville, WI 53545
Phone 608-757-8000
Fax 608-757-8010
Email Sheriff's Office