Penn National Insurance is a property-casualty insurance company, heaquartered in Harrisburg, Pennsylvania. Founded in 1919 by the Pennsylvania Farmers and Threshermen's Mutual Protective Association, under the name Pennsylvania Threshermen's and Farmer's Mutual Casualty Company, the company first provided only workers' compensation insurance for farm workers who operated steam-driven threshing machines. The company expanded into all lines of property-casualty insurance, and now does business in nine states (Pennsylvania, Maryland, Delaware, New Jersey, Virginia, North Carolina, South Carolina, Tennessee, Alabama).