St. Clair County is a county of the U.S. state of Alabama. Its name is in honor of General Arthur St. Clair, who came to America from Scotland as an officer in the British Army in the French and Indian War. He settled in America and served as a general in the Continental Army during the American Revolution. He also was the only Governor of the Northwest Territory. As of 2000 the population was 64,742. It has one county seat in Ashville and another in Pell City. While other counties in Alabama have multiple courthouses,

St. Clair County is the only county in Alabama with more than one county seat St. Clair County was established on November 20, 1818 by the Alabama Territory legislature by splitting the area from Shelby County.