Founded in 1977, Zenith Insurance Company is a part of Zenith National Insurance. The company provides workers' compensation insurance in more than 45 states and the District of Columbia. It offers insurance coverage for injured workers and cases related to fraud and abuse. Zenith Insurance Company provides workplace safety services to help prevent injuries by implementing safety programs. Its sister company ZNAT Insurance Company provides property and casualty insurance. Its clients include agricultural farms, car dealers, dairies, dentists, dry cleaners, golf courses, hotels, restaurants, retailers and wineries. Zenith Insurance Company maintains of its locations in Fresco, Calif.