North Dakota is the least expensive state in the country for purchasing auto insurance, with an average expenditure of $530 per policy in 2006, according the National Association of Insurance Commissioners. Drivers with poor driving records who are unable to obtain insurance on the voluntary market are protected by the North Dakota Automobile Insurance plan, also known as "the assigned risk plan." Major insurance companies have offices in Fargo, Bismarck, Grand Forks and Minot. If you want more details on North Dakota auto insurance requirements, you should contact the North Dakota Insurance Department (http://www.nd.gov/ndins/).