3. Allstate - Wikipedia
Description: The Allstate Corporation is one of the largest insurance providers in the United States and one of the largest that is publicly held. The company also has personal lines insurance operations in Canada.Allstate was founded in 1931 as part of Sears, Roebuck and Co., and was spun off in 1993. The company has had its headquarters in Northfield Township, Illinois, near Northbrook since 1967.