The mission of the St. Clair County Sheriff's Office is to provide the citizens of the county with honest, reliable, competent, and professional officers and staff. The Sheriff’s Office strives to ensure that St. Clair County is a safe place to live, work, raise a family, retire, enjoy leisure time, or simply to travel through. The officers of this agency will do everything in their power to be a positive influence to all they encounter. The employees of this agency are always available to assist with the needs, concerns, and interests of the citizens of St. Clair County. The Sheriff's Office continually searches for new and more effective ways to provide better service, educate the community, enhance safety, heighten moral, and improve the public's perception of Law Enforcement.
St. Clair County was named for Arthur St. Clair, a Revolutionary War General. It was organized in January 29, 1841. The county is 698 square miles. It is a third class county with a population of 9,805 and an assessed valuation of is $106,446,998. The county seat is the City of Osceola. Other cities and villages in the county include Appleton City, Lowry City, Collins, and Roscoe.